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Subtropical Plant Science    2023, 52 (5): 0-.   Abstract （158）      PDF（pc） （1175KB）（139）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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Neighbor Density and Habitat Heterogeneity Jointly Determined the Seedling Abundance in Gaoligong Mountains, Southwestern China WANG Li-ping, WU Jun-jie, CHAI Yong, YU Xiao-li, SUN Ji-wen, FENG Zhe, CHEN Feng-xian Subtropical Plant Science    2024, 53 (2): 89-99.   DOI: 10.3969/j.issn.1009-7791.2024.02.001 Abstract （156）      PDF（pc） （948KB）（130）       Knowledge map    Save To understand the crucial dependency factors of seedling abundance with a diameter at breast height (DBH) <1 cm in a mid-montane moist evergreen broad-leaved forest of 4 hm2 Gaoligong Mountains forest. The generalized linear mixed models were used to analyze whether neighbor density and habitat factors shaped seedling abundance at the community and species level, and whether the strength of them varied with temporal. The results showed that: (1) The effect of neighbor density and habitat factors on all seedling abundance were significant and gradually strengthen at the community level. The positive correlation of common species with heterospecific neighbor density increased significantly, while no correlation with environmental factors. The seedling abundance of rare species reflected non-significant with neighbor density and environmental factors. (2) At species level, the seedling abundance of Psychotria morindoides was only slightly and significantly negatively associated with elevation in 2022. From 2020 to 2023, the significant positive effects of biotic and habitat heterogeneity on seedling abundance of Myrsine semiserrata. The higher canopy openness, elevation, and soil total potassium and temperatures, the higher seedling abundance. However, these correlations were non-significant on the seedling abundance of Symplocos stellaris var. aenea in the four periods. This study indicated that the seedling abundance is driven by both neighbor density and habitat heterogeneity. The strength of neighbor densities and habitat factors differs greatly among community, species and temporals, which relative importance of variables can maintain the community diversity in the plot. Reference | Related Articles | Metrics | Comments（0）

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Regulation of Leaf Functional Traits and Plasticity on the Growth of Hedyotis caudatifolia in Different Habitats WEI Lan-ying, ZENG Chun-yang, YANG Xiao-lan, HUANG Dao-jing Subtropical Plant Science    2024, 53 (2): 100-112.   DOI: 10.3969/j.issn.1009-7791.2024.02.002 Abstract （136）      PDF（pc） （3264KB）（1539）       Knowledge map    Save Most previous researches of plant adaptability to environmental changes were conducted using functional traits at species level. However, one species might displayed distinct ecological strategies in different habitats. Therefore, it’s important to analyze the intraspecific variation of leaf functional traits and their plasticity for understanding the environmental adaption mechanisms and survival status of plant individuals. The present study determined the plant height, biomass and leaf functional traits such as morphological, stomatal, anatomical and chemical characters of medicinal plant Hedyotis caudatifolia from four habitats (grassland, shrub-grassland, forest edge and understory) in Mt. Dayao of Guangxi. Results showed that functional traits varied apparently among different habitats. Among all leaf functional traits, potential conductance index (PCI) exhibited the highest coefficient of variation (CV), while CV of leaf carbon content, looseness of leaf spongy tissue, spongy mesophyll thickness and leaf thickness were lower. Plasticity index (PI) ranked inconsistently with CV for some traits, i.e. potential conductance index displayed the highest PI, followed by mass-based chlorophyll content, leaf area, specific leaf area and ratio of leaf palisade to spongy mesophyll thickness, etc. Principal component analysis (PCA) indicated that the variations of leaf functional traits were closely correlated with light utilization, water conductivity and nutrient strategies, dominated by light adaptation. Analysis of Variable Importance in Projection (VIP) revealed that anatomical structure contributed to the most variances of plant height and biomass, followed by stomatal characters; chemical traits accounted for the least in the contribution rates. The changes of leaf functional traits and their syndromes of H. caudatifolia facilitated itself in utilizing natural environmental resources such as light and water. Thus, it was capable of coping with disadvantages in different habitats, and finally promoted the plant growth and biomass accumulation, which enabled its individuals to compete with other plants in the community for the further survival and reproduction. The study will provide references for the assessment of survival status and safety risk of H. caudatifolia under degraded habitats. Reference | Related Articles | Metrics | Comments（0）

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Physiological Characteristics of Flower Bud Differentiation in Erythrina sykesii under Drought Stress LIU Bei-ning, CHEN Fa-xing Subtropical Plant Science    2024, 53 (2): 113-119.   DOI: 10.3969/j.issn.1009-7791.2024.02.003 Abstract （135）      PDF（pc） （597KB）（79）       Knowledge map    Save In order to explore the physiological characteristics of drought stress-induced flower bud differentiation in Erythrina sykesii, the physiological response of E. sykesii to drought stress and its flowering induction characteristics were analyzed. The physiological indicators such as the contents of photosynthetic pigments, soluble sugar, malondialdehyde and endogenous hormones, and the activities of superoxide dismutase (SOD) and peroxidase (POD) in the leaves of 8-year-old E. sykesii under drought stress were determined. The results showed that the photosynthetic pigment and endogenous hormone contents and antioxidant enzyme activities in the leaves of E. sykesii exhibited a trend of first increasing and then decreasing with the increasing degree of drought stress. The contents of chlorophylls and carotenoids, starch, and soluble sugar, IAA, GA3 and ZR in the leaves reach their maximum values under mild drought stress. The SOD, POD, catalase (CAT) activities and soluble protein content reach their maximum values under moderate stress. The contents of malondialdehyde, ABA, and carbon nitrogen ratio all significantly elevated along with the increasing degree of drought stress. The above physiological indexes showed that the flowering rate of branches increased significantly under drought stress, of which the effect of the moderate stress was the most obvious. The results indicated that the plant cell damage could be alleviated by increasing ABA content and antioxidant enzyme activity, and the flower bud differentiation and flower formation rate of branches were promoted under moderate drought stress. Reference | Related Articles | Metrics | Comments（0）

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Effects of 60Co-γ Irradiation on Physiological Indicators of Camellia drupifera ZHA Qian-hui, HUANG Jiu-xiang, LÜ Ming-tao, GONG Yong-jun, HUANG Yong-fang Subtropical Plant Science    2023, 52 (5): 404-407.   DOI: 10.3969/j.issn.1009-7791.2023.05.005 Abstract （135）      PDF（pc） （695KB）（30）       Knowledge map    Save In order to study the physiologic changes of Camellia drupifera seedlings after 60Co-γ irradiation, the authors did a 60Co-γ by 0 Gy, 40 Gy, 50 Gy, 60 Gy and 70 Gy irradiation of seeds from two excellent materials C. drupifera ‘Fanlong 3’ and ‘Fanlong 5’ and measured chlorophyll content, soluble sugar content, soluble protein content, peroxidase (POD), superoxide dismutase (SOD) in leaves. The result showed that the influence on physiologic index of C. drupifera of 60Co-γ irradiation by various kinds dose was different. The chlorophyll content of 50 Gy group of ‘Fanlong 3’ and ‘Fanlong 5’ were significantly lower than those of other groups (P<0.05). The change tends of soluble sugar content on ‘Fanlong 3’ and ‘Fanlong 5’ were different which showed that the 60 Gy of ‘Fanlong 3’ was relatively low and the 70 Gy of ‘Fanlong 5’ was relatively low. The change tends of soluble protein content on ‘Fanlong 3’ and ‘Fanlong 5’ were the same which showed that the soluble protein contents of 60 Gy treatment were relatively low. The change tends of antioxidant enzyme activity on ‘Fanlong 3’ and ‘Fanlong 5’ were different. The SOD activity of high dose group (60 Gy, 70 Gy) was relatively low and the POD activity of 40 Gy treatment was relatively high in ‘Fanlong 3’. The SOD activity of control group was relatively low and that of 70 Gy treatment was relatively high in ‘Fanlong 5’. The POD activity of 60 Gy treatment was relatively low and that of 50 Gy treatment was relatively high in ‘Fanlong 5’. Reference | Related Articles | Metrics | Comments（0）

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Chemical Constituents and Antibacterial and Anti-inflammatory Activities of Ethanol Extracts from Cinnamomum burmanni Leaves SU Xin-ke, YAO Min, YANG Lei, WU Peng, JIN Jing-wei, XIONG Ping, HUANG Jun-ming, LI Dong-li Subtropical Plant Science    2023, 52 (5): 381-390.   DOI: 10.3969/j.issn.1009-7791.2023.05.002 Abstract （135）      PDF（pc） （833KB）（46）       Knowledge map    Save Modern separation techniques such as D101 macroporous resin, MCI macroporous resin, positive and negative silica gel, gel column chromatography and semi-preparative high performance liquid chromatography were used to separate, purify and identify the chemical components in 95% ethanol extracts of Cinnamomum burmanni leaves from Meizhou, Guangdong Province. At the same time, the antibacterial activities of the compounds were determined by microplate method, and their anti-inflammatory activities were determined by LPS-induced BV2 cells. The results showed that 25 compounds were isolated and identified from the 95% ethanol extracts of C. burmanni leaves, including flavonoids (1–3), lignans (4–6), simple phenylpropanoids (7–16), coumarins (18), benzoquinones (20–21), sesquiterpenes (22–24) and indole alkaloids (25). Except for compounds 1, 2, 5 and 18, all of them were isolated from C. burmanni for the first time. The results of antibacterial experiments showed that compounds 20 and 21 showed good antibacterial activity against Staphylococcus aureus, with MIC of 32 μmol·L–1, while MBC of compound 20 was 64 μmol·L–1, and MBC of compound 21 was 32 μmol·L–1. The results of antibacterial kinetics also showed that compound 21 had better antibacterial activity than compound 20. The results of anti-inflammatory experiments showed that compounds 5, 6 and 7 could inhibit the production of NO in BV2 cells induced by LPS, and showed good anti-inflammatory activity, the IC50 values were 7.85 μmol·L–1, 24.97 μmol·L–1 and 7.49 μmol·L–1, respectively. Reference | Related Articles | Metrics | Comments（0）

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Diversity and Geographical Pattern Analysis of Wild Lamiaceae Species in China CHANG Meng-lin, CHEN Xin-yan, CHEN Shi-pin, MA Liang Subtropical Plant Science    2024, 53 (3): 234-242.   DOI: 10.3969/j.issn.1009-7791.2024.03.007 Abstract （134）      PDF（pc） （1475KB）（577）       Knowledge map    Save Based on the taxonomic database and a large amount of literature, this study takes administrative counties as the basic unit to sort out the wild Lamiaceae distributed in Chinese Mainland. The species diversity, genus flora, and distribution were analyzed, resulting in the establishment of a geographical distribution dataset for wild Lamiaceae in China. As of January 2024, 100 genera and 1,387 species (including subspecies and varieties) were recorded. Among these, only Scutellaria, a genus with more than 150 species. The genera with species numbers between 101 and 150 include Salvia with 137 species and Isodon with 106 species. Thirty-six genera contain between 6 and 50 species, totaling 733 species, representing the main component of wild Lamiaceae in China. Fifty-nine genera have 5 or fewer species, totaling 119 species, accounting for 8.58% of the total number of wild Lamiaceae species in China. Thirty-three genera are represented by only one species in China, indicating a high genus diversity but low species richness within genera. The primary genera are Scutellaria, Salvia, and Isodon, with a total of 394 species, accounting for 28.62% of the total species. Wild Lamiaceae are distributed across all provinces, autonomous regions, and municipalities in China, primarily in the eastern Himalayas, the mountains of western Hubei and eastern Chongqing, southeastern Tibet-northwestern Yunnan, and the mountains of eastern Yunnan-western Guangxi. The highest species richness is found in Yunnan Province (658 species) and Sichuan Province (532 species). The flora of the genus was diverse. According to Wu Zhengyi's classification of the distribution areas of Chinese seed plant genera, the 100 genera of wild Lamiaceae in China belong to 15 typical types and 12 variant types. Tropical and temperate floristic elements dominate. Genera related to tropical flora account for 39 genera and 548 species, showing a significant predominance. Temperate elements follow, with six genera exhibiting a Mediterranean distribution and two genera exhibiting disjunct distributions between East Asia and North America. Wild Lamiaceae in China are functionally diverse, mainly categorized into medicinal plants, aromatic plants, nectar plants, wild vegetables, ornamental plants, and oil plants. Although some Lamiaceae groups have been explored for their value, many groups remain under-researched, warranting further mechanism research and utilization. Reference | Related Articles | Metrics | Comments（0）

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Studies on Diversity of Lycophytes and Ferns in the Chebaling National Nature Reserve, Guangdong Province ZHANG Ying-ming, WANG Ting, DENG Shuang-wen, CUI Yu-wen, TAN Hai-rong, CHEN Hong-feng Subtropical Plant Science    2024, 53 (3): 243-256.   DOI: 10.3969/j.issn.1009-7791.2024.03.008 Abstract （129）      PDF（pc） （5121KB）（1170）       Knowledge map    Save In order to comprehensively document the plant diversity within the Chebaling National Nature Reserve in Guangdong and to provide data support for the long-term monitoring, conservation management, and public education regarding biodiversity within the reserve, we conducted field surveys and specimen collection of ferns and lycophytes using transect methods from June to August 2023. A statistical analysis of the species composition, floristic characteristics, and resource status of ferns and lycophytes within the reserve was carried out by integrating literature data. The results indicated: (1) A total of 231 species (including infraspecific taxa) of ferns and lycophytes belonging to 75 genera and 25 families distributed in the nature reserve, among them 64 species from 11 families and 28 genera were new records in the area. (2) There were six monotypic families and 38 monotypic genera, accounting for 24.00% and 50.67% of the total families and genera, respectively, which reflected the ancient and primitive nature of the ferns and lycophytes flora in the area. (3) Ferns and lycophytes composition in this area are derived from multiple origins. The tropical component ranked at the family (60.00%) and genus (68.00%) levels, while at the species level, the subtropical component (54.98%) held prevalence, followed by the tropical component (29.87%). It aligns with the characteristics of subtropical flora, demonstrating a certain degree of features associated with tropical flora. (4) Compared with adjacent nature areas, Chebaling Nature Reserve shows the closest relationship with Qingyunshan Provincial Nature Reserve in Guangdong province. The similarity indices of species, genera, and families (Jaccard/Krober coefficients) stand at 92.00/96.00, 73.42/85.33, and 42.42/62.86, respectively. This suggests a probable connection to their geographical proximity and similar climatic features. (5) Within the nature area, ferns and lycophytes resources are abundant, including six edible species, 145 medicinal species, 141 ornamental species, and 32 species with industrial value. These resources provide rich opportunities for the future rational development and effective utilization of plants. Reference | Related Articles | Metrics | Comments（0）

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Differences in Microbial Communities among Ganpu Tea from Different Years HONG Pei-yu, WANG Ya-yu, WU Hong Subtropical Plant Science    2024, 53 (3): 191-200.   DOI: 10.3969/j.issn.1009-7791.2024.03.001 Abstract （127）      PDF（pc） （5289KB）（666）       Knowledge map    Save Ganpu tea is made by removing the flesh of fresh Citrus reticulata 'Chachiensis' and filling them with Yunnan Pu-erh tea. It has both the aroma of Pericarpium Citri Reticulatae 'Chachiensis' and the fragrance of Pu-erh tea. In this study, Ganpu teas were separated into tea leaves and peels with different aging times for microbiome analysis. It was found that the microbial composition of the peels and tea leaves of Ganpu tea was more similar in the early aging stage, while the differences became more pronounced in the later aging stage. In tea leaves of Ganpu tea aged at different times, the dominant bacterial genera included Bacillus, Staphylococcus, and Blastobotrys. In the peel of Ganpu tea aged at different times, the dominant bacteria aged for 0 to 1 year include Staphylococcus, while the dominant bacteria aged for the other three times are Acinetobacter. In the fungal community, the dominant fungal genera in aged 0, 1, and 5 year old peels, as well as five different aged Ganpu tea leaves, are all Blastobotrys. The dominant fungal genus in aged 7 and 9 year old Ganpu tea peels is Xeromyces. Among the tea leaves or peels of Ganpu tea at different aging times, the majority of samples (over 75% of the abundance) shared the same Amplicon Sequence Variants (ASVs). Correlation analysis based on these shared ASVs revealed a significant positive correlation between Aspergillus and other microorganisms in the network, although its abundance was not particularly high in Ganpu tea at different aging times. Reference | Related Articles | Metrics | Comments（0）

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Effects of Exogenous Strigolactone on Axillary Bud Elongation and Expression of Genes Related to the Strigolactone Metabolic Pathway in Tobacco TIAN Hui-yuan, TANG Bo-xi, WANG Yuan-xiu, LIU Fan, GUO Kai-yang, LIU Guo-qin Subtropical Plant Science    2023, 52 (5): 369-380.   DOI: 10.3969/j.issn.1009-7791.2023.05.001 Abstract （125）      PDF（pc） （6086KB）（1208）       Knowledge map    Save The effects of strigolactone (SL) on the elongation of tobacco axillary buds and the expression of genes related to its metabolic pathway were carried out, to explore the relationship between SL and the growth of tobacco axillary buds and the expression changes of SL-related genes during the elongation of tobacco axillary buds, which could establish a theoretical basis for the molecular regulation mechanism of SL in regulating the growth of tobacco axillary buds. This study investigated the developmental changes of tobacco axillary meristematic tissues after decapitation, and observed the various genes associated with SL metabolic pathway of tobacco axillary buds by treatment with GR24, an artificial synthetic analogue of SLs, using paraffin sectioning and transcriptome technique. The results showed that the axillary meristem of tobacco was composed of three cell regions: central blast region (CM), peripheral meristem (PM) and costal meristem (RM), among which the CM was located at the top of the axillary meristem, which could form PM and RM through the division of basal and lateral cells, the PM was located on both sides of the axillary meristem, and the RM was located below the CM region and the inner side of the PM region. The cell volume and arrangement of the three cell regions were different, indicating that there were differences in cell division in each part of the meristem. After axillary meristem development to form axillary buds, it was found that GR24 could inhibit the elongation of axillary buds at 1–3 nodes by exogenous application of different plant growth regulators, while BR could promote the elongation of axillary buds. Transcriptome analysis revealed that SL could affect the expression of genes related to its own metabolic pathway, SL induced the expression of D27, D14, DAD2 and SMAX1-LIKE4 compared to CK and TIS-108 [a triazole-type strigolactone(SL)-biosynthesis inhibitor] treatment, whereas, D27, D14 and DAD2 were down-regulated by TIS-108 treatment, the expression of SMAX1 was inhibited by SL, while TIS-108 treatment induced the expression of SMAX1. The axillary buds of tobacco are developed from three hyphal regions of the axillary meristem, while different plant growth regulators have different effects on the axillary buds of tobacco. BR can promote the elongation of the axillary buds of tobacco, while SL can inhibit the elongation of the axillary buds, and the genes related to the metabolic pathway may play an important regulatory role in the elongation of the axillary buds of tobacco. Reference | Related Articles | Metrics | Comments（0）

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Species Composition and Floristic Characteristics of Eucalyptus spp. Plantations in Guangxi, South China HUO Chun-lin, ZHANG Zhong-hua, HU Cong, XU Chao-hao, HU Gang Subtropical Plant Science    2023, 52 (5): 424-432.   DOI: 10.3969/j.issn.1009-7791.2023.05.008 Abstract （125）      PDF（pc） （766KB）（819）       Knowledge map    Save Through integrating field surveys and literature data, this study analyzed the species composition and floristic characteristics of vascular plants in Eucalyptus plantation in Guangxi. The results showed that there were 584 species from 369 genera and 120 families of vascular plants in the Eucalyptus plantation of Guangxi. Among them, ferns consisted of 49 species from 28 genera and 15 families, gymnosperms included 6 species from 4 genera and 4 families, and angiosperms comprised 529 species from 337 genera and 101 families. These values account for 38.83%, 18.35%, and 6.37% of the total number of vascular plant families, genera, and species in Guangxi, respectively, indicating relatively low plant diversity in Eucalyptus plantation. Shrubs (201 species) dominated the vegetation, while lianas (91 species) were the least represented. At the family and genus level, this flora was dominated by plurimotypic families, mesotypic family, oligotypic genera and monotypic genera. The vascular plant genera and species tended to be concentrated in plurimotypic families, oligotypic genera and monotypic genera, indicating that the flora had a certain differentiation potential and the composition of families and genera was relatively scattered. The abundant primitive taxa of dominant families, genera, and species indicate that the floristic components had a certain degree of antiquity. There were a total of 14 distribution types and 15 subtypes in the genus distribution area. The ratio of tropical to temperate genera (R/T value) was 5.37, with tropical components being the main component, with pan tropical components being the most dominant. Only 2 genera and 2 species were endemic to China in the flora. Overall, the flora of Eucalyptus plantation in Guangxi exhibited complex composition, apparent tropical characteristics, ancient origins, but lacked unique elements, and had relatively low differentiation. These research findings could be utilized to guide the analysis of plant diversity and floristic characteristics in Eucalyptus plantation in Guangxi. Reference | Related Articles | Metrics | Comments（0）

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Morphological Development of Fruits and Seeds of Aucuba chinensis in Badagongshan National Nature Reserve, Hunan Province LU Xiao-rong, LIU Jiang-tao, YU Ping, LI Long, CHEN Jin-hua, GU Zhi-rong, HE Gang, TIAN Xiang-rong Subtropical Plant Science    2023, 52 (5): 413-423.   DOI: 10.3969/j.issn.1009-7791.2023.05.007 Abstract （124）      PDF（pc） （6736KB）（27）       Knowledge map    Save Using Aucuba chinensis from Badagong Mountain National Nature Reserve as a model, the regularity of fruit and seed development were elucidated basing on monthly observation on fruit/seed length, width, color and embryonic/endosperm morphology. On this basis of observation, the relationship between morphological developmental and ecological factors including annual average temperature and rainfall were analyzed. The results showed that: (1) The total development of fruit took 13 months, which means the process from fruit abscission to falling lasted from April to next April. (2) The variation of fruit length, width and peel thickness manifested a tendency which include four stages as “slow-fast-slow-fast”, and which just like a typical double “S” shaped curve. And the most obvious development of fruit shape index appeared in stage Ⅱ, whose value varied from 2.63 to 1.57. (3) In the developmental process, fruit color kept green in the early and lasted for a long time, and then turn red very quickly, which should attribute to the rapid value decreasing of blue and green color. (4) Embryo and endosperm growth were synchronized with fruit development, and growth stage Ⅰ was the critical stage for embryonic and endosperm development, in which the embryo length/width ratio increased from 1.83 to 2.56; the endosperm developed as a cellular phenotype without a typical pasty stage. (5) At 13 months after corolla drop, about 77% of the embryos were still torpedo shaped. (6) There were significant positive correlation in fruit shape index/embryo ratio and temperature/rainfall (P<0.05), but fruit shape index was more dependent on precipitation (P<0.01) and embryo rate was more dependent on annual average temperature. Based on the above, the fruit development of A. chinensis was characterized by the obvious phenomenon of simultaneous flowering and overlapping fruiting periods. And the limitation of hydrothermal conditions was probably the main reason for the slow development of fruit and seed and the impact on seedling establishment. At the same time, most of the seed embryos were not fully differentiated when the fruits were abscised, which meant that the seed development had to undergo after-ripening, and therefore the seeds were morphologically dormant. Reference | Related Articles | Metrics | Comments（0）

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Investigation and Analysis of the Diversity of Self-Generated Herbaceous Plants in Three Universities in Lanzhou City AN Qi, LIU Wen-lan Subtropical Plant Science    2024, 53 (3): 257-270.   DOI: 10.3969/j.issn.1009-7791.2024.03.009 Abstract （120）      PDF（pc） （11976KB）（47）       Knowledge map    Save Autogenic plants are essential plant materials for constructing low-cost, low-maintenance, and sustainable conservation-oriented landscapes. To comprehend the current status of autogenic herbaceous plant resources in colleges and universities within Lanzhou City and to apply them more effectively in gardens, the grid sampling approach was adopted to carry out monthly investigations of autogenic herbaceous plants on the campuses of Gansu Agricultural University, Lanzhou University, and the old campus of Lanzhou University of Technology from April to October 2023. The habitats were classified into 4 types, totaling 146 sampling points and 438 sampling plots. The species composition and diversity characteristics were analyzed through calculation methods such as the Shannon-Wiener index and Ducan test. The results indicated that a total of 103 species belonging to 87 genera and 32 families of autogenic herbaceous plants were surveyed in the three universities, among which 61 were native plants, accounting for 59.22%; 21 were invasive alien plants, constituting 20.39%. The life form was predominantly perennial herbs, with a total of 63 species, and 40 were annual and biennial herbs. The top 3 species in terms of species frequency were Taraxacum mongolicum (67.63%), Viola prionantha (55.76%), and Trifolium repens (48.32%), which were abundant in all sampling plots and had certain growth advantages. The dominant families were Compositae and Poaceae, with 44 species belonging to 34 genera. Compositae plants accounted for the highest proportion; among them, Taraxacum mongolicum held significant values within the top 5 in three types of sampling plots such as shade, grassland, and road, and ranked first in the shade sampling plot of Gansu Agricultural University, with an important value of 42.21. From the perspective of spatial pattern, there were more species in shade and grassland habitats, with 59 and 47 species respectively, and their Shannon-Wiener index was in the order of shade > grassland > road > waterside; the Shannon-Wiener index demonstrated a trend of initially rising, then falling, and subsequently rising over the months, with the highest values in June and October, averaging 6.41 and 6.17 respectively. The diversity of each habitat sampling plot was at a relatively high level, which was related to the climate, human disturbance, and management level. The autogenic herbaceous plants on campus exhibit good ecological adaptability and plant landscape effects. Scientific utilization and planning can shape garden plant landscapes with distinctive features and ecological significance. Reference | Related Articles | Metrics | Comments（0）

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Photosynthetic Characteristics and Photosynthetic Carbon Sequestration and Oxygen Release Capacity of 11 Mangrove Species ZHANG Liu, ZHAN Qiao-si, GUO Wei, LAI Can, YANG Qiong, ZHANG Hui Subtropical Plant Science    2023, 52 (6): 465-474.   DOI: 10.3969/j.issn.1009-7791.2023.06.001 Abstract （116）      PDF（pc） （880KB）（577）       Knowledge map    Save Mangrove forest is an important part of the global carbon cycle, and the study of the photosynthetic characteristics of different mangrove plants and the difference in carbon sequestration and oxygen release capacity is an important basis for the cumulative assessment and protection and restoration of carbon pool of mangrove biomass. The daily dynamics of photosynthesis rate of mangrove trees and leaf area index were determined by using Li-6800 Portable Photosynthesizer and TOP-1300 Canopy Analyzer, to analyze the daily capacity of carbon sequestration and oxygen release of the target species. Carbon sequestration per unit land area was used as a measure of the CO2 absorption capacity of mangrove plants for cluster analysis to further analyze the main factors affecting the oxygen sequestration capacity of plants. The results showed that: (1) The net photosynthetic rate of six species was unimodal curve, including Cerbera manghas, Kandelia obovata, Heritiera littoralis, Acanthus ilicifolius, Hibiscus hamabo and Volkameria inermis, and the remaining five species showed a bimodal curve due to photosynthetic lunch break, among which Cerbera manghas was the lowest and Volkameria inermis was the highest. (2) In terms of carbon sequestration and oxygen release capacity per unit land area, 3 species of shrubs (Acanthus ilicifolius, Hibiscus hamabo, Volkameria inermis ) and 4 species of trees (Aegiceras corniculatum, Excoecaria agallocha, Heritiera littoralis, Sonneratia apetala ) performed better. (3) The results of the clustering of daily carbon sequestration per unit land area of 11 mangrove species were divided into three categories, the first category included Hibiscus hamabo and Volkameria inermis with the highest daily carbon sequestration, the second category was Aegiceras corniculatum, Excoecaria agallocha, Heritiera littoralis, Acanthus ilicifolius and Sonneratia apetala with medium daily carbon sequestration, and the third category was Cerbera manghas, Thespesia populnea, Bruguiera gymnorhiza and Kandelia obovata with the lowest daily carbon sequestration. (4) The main influencing factors of daily carbon sequestration and oxygen release per unit land leaf area were transpiration rate (Tr) and stomatal conductance (Gs). Reference | Related Articles | Metrics | Comments（0）

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Differences in Growth and Metabolics between Hydroponic and Peat Soil Cultivation Anoectochilus roxburghii ZHAO Qi, WANG Chi, ZHAO Feng Subtropical Plant Science    2024, 53 (1): 22-30.   DOI: 10.3969/j.issn.1009-7791.2024.01.003 Abstract （115）      PDF（pc） （419KB）（1555）       Knowledge map    Save The aim of the study was to systematically compare the differences in growth indexes and quality components between hydroponics and soil cultivation for 30 days and 90 days, and to investigate the main differential metabolic pathways of Anoectochilus roxburghii. The results showed that comparing with soil cultivation, the root length of hydroponics increased significantly on 30th day, and the root length and leaf area increased significantly on 90th day, but the stem thickness decreased. The net photosynthetic rate increased significantly on 30th day of hydroponics, and the chlorophyll content increased significantly on 90th day of hydroponics. In terms of components, total flavonoids and kinsenoside increased significantly on 30th day of hydroponics, and aspartic acid, γ-aminobutyric acid, and hydroxyproline decreased significantly; aspartic acid, asparagine, γ-aminobutyric acid, and methionine decreased significantly on 90th day of hydroponics. On metabolic pathways, lipid, flavonoid and flavonol biosynthesis, diterpene and secondary metabolic biosynthesis were significantly up-regulated on 30th day, and lipid and secondary metabolic pathways were significantly up-regulated, while diterpene biosynthesis underwent a down-regulation on 90th day in the hydroponically grown group compared to the soil-grown group on 30th day and 90th day. Reference | Related Articles | Metrics | Comments（0）

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Preliminary Study on Bryophyte Diversity in Medog of Xizang, China MA He-ping, SI Meng-xin, GAO Zhi-yuan Subtropical Plant Science    2024, 53 (1): 53-59.   DOI: 10.3969/j.issn.1009-7791.2024.01.007 Abstract （115）      PDF（pc） （492KB）（119）       Knowledge map    Save Medog is rich in plant species due to its special geographical location and huge elevation difference. Its unique physical geography and climatic conditions give birth to a variety of habitats for the distribution of bryophytes and form a diverse bryophyte community. In order to study the bryophyte diversity and its life-form composition in Medog of Xizang, line collection methods was used to investigate and collect bryophyte specimens, species identification and correlation analysis. The results showed that: (1) the present checklist includes 631 species belonging to 239 genera in 83 families, with 2 hornwort species in 2 genera and 2 families, 217 liverwort species in 68 genera and 38 families, and 412 moss species in 169 genera and 43 families. There are 19 dominant families, 26 dominant genus and 19 dominant species of bryophytes in this area. (2) There are 327 species belonging to Soil and Rock-community, accounting for 51.83% of the total bryophytes species in Medog; There are 216 species belonging to Rock-community, accounting for 34.23% of the total bryophytes species in the area; there are 173 species in Soil-community, accounting for 27.42% of the total bryophytes species. There are 97 species in Tree-community, accounting for 15.37% of the total bryophytes species in this area, and 21 species in Leaf epiphyte-community, accounting for 3.32% of the total bryophytes species in this area. Overall, because of its good natural environment conditions, Medog provides good conditions for the survival of rich bryophytes. Reference | Related Articles | Metrics | Comments（0）

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Current Status of Molecular Markers and Genomics of Anoectochilus Herba LIN Shu-qing, MA Xiang-li, XU Wen, HUANG Ze-hao Subtropical Plant Science    2024, 53 (5): 478-486.   DOI: 10.3969/j.issn.1009-7791.2024.05.013 Abstract （109）      PDF（pc） （442KB）（35）       Knowledge map    Save With the development of molecular biotechnology, significant progress has been made in the molecular pharmacognosy research of Anoectochilus herba. This paper summarized the molecular pharmacognostic research on molecular identification, transcriptome sequencing, functional gene cloning and synthesis of Anoectochilus herba, and discussed the problems and prospects of molecular marker biotechnology in the genetic analysis, molecular identification and functional gene discovery, in order to further promote the protection, development and utilization of Anoectochilus herba resources. Reference | Related Articles | Metrics | Comments（0）

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Effects of Drought Stress on Flower and Leaf Traits and Antioxidant Enzyme Activities of Gardenia jasminoides CHEN Qing-hai Subtropical Plant Science    2024, 53 (2): 120-127.   DOI: 10.3969/j.issn.1009-7791.2024.02.004 Abstract （102）      PDF（pc） （1988KB）（80）       Knowledge map    Save The effects of drought stress on the growth, mosaic and leaf traits and antioxidant enzyme activities of Gardenia jasminoides were explored in this paper. Asexual line cuttings of G. jasminoides ‘Lingdi Zhenzhi’ were used as test materials, and the changes of plant height growth, ground diameter growth, relative chlorophyll content, floral traits and leaf traits under different degrees of drought stress were measured and correlation analysis was conducted. The experimental results showed that drought stress significantly reduced the total growth of G. jasminoides plant height and the growth of ground diameter, and reduced the flower diameter, the number of new leaves, leaf length, leaf width and other indexes, and the inhibition effect would be more and more obvious with the increasing of the drought degree, but the overall trend of SPAD was increasing. Drought stress shortened the growth cycle of single leaf of G. jasminoides, and accelerated the maturation of leaves but inhibited the formation of new leaves, thus reducing the accumulation of biomass of G. jasminoides and reducing water consumption, while causing the root system of G. jasminoides to grow slowly and it was difficult to take in enough nutrients, which was one of the reasons leading to the poor growth of G. jasminoides flower traits and leaf traits. Reference | Related Articles | Metrics | Comments（0）

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Deproteinization Methods of Crude Polysaccharide from Seeds of Livistona chinensis and Its Inhibitory Activity on Osteoclast Differentiation LIU Qiu, LIU Jia-quan, WU Jing-yu, RAN Heng-xing, WU Zheng-rong, JIN Jing-wei Subtropical Plant Science    2024, 53 (3): 201-206.   DOI: 10.3969/j.issn.1009-7791.2024.03.002 Abstract （101）      PDF（pc） （2862KB）（462）       Knowledge map    Save This study primarily aimed to explore the optimal protein removal method for polysaccharide of the seed of Livistona chinensis. Using protein clearance rate and polysaccharide retention rate as evaluation indicators, the effects of Sevage method, enzymatic method, and the combination of enzyme and Sevage method on the protein removal from polysaccharide of the seeds were investigated. Additionally, the influence of the obtained polysaccharide of the seeds on RANKL-induced osteoclast differentiation in RAW264.7 cells was explored. The protein removal rates of polysaccharide of the seed using the Sevage method, enzymatic method, and the combined method were 78.85%, 82.40%, and 82.73%, respectively. The polysaccharide retention rates were 72.42%, 92.16%, and 96.72%, respectively. Treatment of RANKL-induced RAW264.7 osteoclast models with polysaccharide of the seed of L. chinensis obtained using the optimal protein removal method revealed that it could reduce the number of osteoclasts generated and decrease their TRAP activity. Therefore, the combination of enzyme and Sevage for protein removal was a relatively effective method that could significantly reduce the protein content in polysaccharide of L. chinensis seed while maintaining a high polysaccharide retention rate. The obtained polysaccharide could also inhibit RANKL-induced osteoclast differentiation in RAW264.7 cells, providing theoretical support for the development of new anti-osteoporosis drugs. Reference | Related Articles | Metrics | Comments（0）

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Characteristics of Leaf Economic Phenotypes of Pinus massoniana under Different Stages of Restoration in the Red Soil Erosion Area of Southern China NING Hong-tao, TENG Yu, WANG Yi-fan, CHEN Ye, LIN Xin-hong, LIU Wen, LI Shou-zhong Subtropical Plant Science    2024, 53 (3): 220-226.   DOI: 10.3969/j.issn.1009-7791.2024.03.005 Abstract （100）      PDF（pc） （744KB）（42）       Knowledge map    Save In the process of ecological restoration, plants form a trade-off strategy between resource acquisition and resource conservation in order to adapt to changes in the environment. The proposal of leaf economic phenotypes provides a theoretical basis for quantifying and describing the resource trade-off strategies of plants. In this paper, we took the leaf traits of Pinus massoniana under different stages of restoration in the southern red soil erosion area as the research object, and explored the changing law of leaf traits (specific leaf area, leaf dry matter content, leaf relative water content, leaf total carbon content, leaf total nitrogen content, and leaf total phosphorus content) of P. massoniana in the process of ecological restoration, as well as the correlation between the leaf traits and the differences between the leaf traits under different stages of restoration. The results showed that specific leaf area, leaf total nitrogen content and leaf total phosphorus content gradually increased with the changes of recovery stage; leaf total carbon content was significantly negatively correlated with leaf total nitrogen content and leaf total phosphorus content; and the PCA1 axis scores of leaf traits increased with the increase of recovery stage. The results indicated that the combination of leaf traits in P. massoniana changed from nutrient-conserving traits to nutrient-acquiring traits with the recovery stage. Reference | Related Articles | Metrics | Comments（0）

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Effect of Yellowing Temperature and Humidity on Comprehensive Evaluation of Chemical Composition of Upper Tobacco Leaves Roasted FANG Chong-chong, ZHANG Hong-fei, PAN Hong, HE Chao-chao, AI Fu-qing Subtropical Plant Science    2024, 53 (2): 143-151.   DOI: 10.3969/j.issn.1009-7791.2024.02.007 Abstract （98）      PDF（pc） （1355KB）（154）       Knowledge map    Save The quadratic saturated D-optimal regression design experiment was used to study the relationship between the curing environment and the comprehensive score of chemical components of Nicotiana tabacum L. leaves in the yellowing stage of Yunyan 87. The results show that the influence of different factors on the comprehensive score of chemical components is temperature effect＞temperature, dry-wet difference interaction effect＞dry-wet temperature difference effect; Under the condition of constant wet-dry difference, the temperature effect equation Y1=83.59-0.89X1+6.35X12, that is, with the increase of temperature, the comprehensive score of chemical components first decreases and then increases. When the temperature X1=39.21 ℃, the comprehensive score Ymin=83.56; Under the condition of constant temperature, the equation of dry-wet difference effect Y2=83.59+3.32X2-4.63X22, that is, with the increase of dry-wet difference, the comprehensive score of chemical components first increases and then decreases. When the dry-wet difference X2=3.72 ℃, Ymax=84.19; Under the interactive effect of temperature and dry-wet difference, the comprehensive score of chemical components in the yellowing stage of upper tobacco leaves was higher when the temperature was 36–36.75 ℃ (dry-wet difference was 2–4 ℃) and 41.3–42 ℃ (dry-wet difference was 3.5–5 ℃). According to the comprehensive score of chemical composition of tobacco leaves, dry bulb temperature of 42 ℃, wet bulb temperature of 37.0 ℃ and relative humidity of 69% are the best combination of temperature and humidity for the quality of upper Nicotiana tabacum leaves. Reference | Related Articles | Metrics | Comments（0）

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Genome Survey Analysis in Ixora chinensis TU Shao-qiang, KE Ling-jun, CAI Yue-qin, LU Luan-mei, YU Hui-wen Subtropical Plant Science    2024, 53 (3): 214-219.   DOI: 10.3969/j.issn.1009-7791.2024.03.004 Abstract （98）      PDF（pc） （2572KB）（251）       Knowledge map    Save Ixora chinensis is a traditional Chinese medicinal herb with both medicinal and ornamental values. The analysis of the genomic characteristics of I. chinensis can lay a theoretical basis for sequencing the whole genome and elucidating the molecular mechanism of biosynthesis of medicinal components. The genomic information of I. chinensis was evaluated by using Survey genome sequencing technology and K-mer analysis to obtain information on genomic duplications, heterozygosity and GC content. Results were as follows. Survey high-throughput sequencing obtained Raw Data 47.63 Gb, filtered Clean data 45.62 Gb. K-mer analysis showed that the genome size was 588.35 Mb, heterozygosity was 1.5598%, repeatability was 64.49%, GC content was 35.71%. The genome of I. chinensis presents high heterozygosity, high repetition, and genome bulky features. Reference | Related Articles | Metrics | Comments（0）

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Inoculation with AMF Promotes the Photosynthetic and Antioxidant Capacities of Ponkan Leaves under High Temperature and Drought Stress ZHOU Hong-hui, GE Cong, HUANG Xiao-bing, ZHANG Long, LU Cong-hui, ZHANG Yu-ping, WANG Ping Subtropical Plant Science    2024, 53 (5): 389-398.   DOI: 10.3969/j.issn.1009-7791.2024.05.001 Abstract （98）      PDF（pc） （1709KB）（34）       Knowledge map    Save The effects of inoculation with Arbuscular mycorrhizal fungi (AMF) on the photosynthesis and antioxidant capacity in the leaves of Citrus reticulata ‘Ponkan’ under high temperature and drought stress were investigated. This study would provide Ponkan a production measure for resisting high temperature and drought stress. The experimental treatments were designed as follows: (1) Ponkan without AMF inoculation under high temperature and drought stress; (2) Ponkan with AMF inoculation under high temperature and drought stress; (3) Ponkan without AMF treatment under normal environmental conditions (control). In this study, AMF infection rate in the root and phenotype of Ponkan were observed, and the photosynthetic parameters, reactive oxygen species (ROS) content and antioxidant enzyme activities were measured in the leaves. The results showed that the leaves of Ponkan without AMF inoculation were obviously yellowed and wilted under high temperature and drought stress compared with the control. The net photosynthetic rate, stomatal conductance, transpiration rate, water use efficiency, maximum photochemical efficiency, actual photosynthetic efficiency and photosynthetic electron transport efficiency in the leaves of Ponkan without AMF inoculation were significantly decreased under high temperature and drought stress, while the intercellular CO2 concentration was increased compared with those of control. However, the net photosynthetic rate and stomatal conductance were increased, the intercellular CO2 concentration was decreased, and the photosynthetic capacity was enhanced in the leaves of Ponkan with AMF inoculation compared with those of Ponkan without AMF inoculation under high temperature and drought stress. In addition, the contents of O2܋, H2O2 and malondialdehyde (MDA) in leaves of Ponkan without AMF inoculation were increased while the activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) and ascorbate peroxidase (APX) were decreased under high temperature and drought stress compared with those of control. However, the contents of O2܋, H2O2 and MDA were decreased and the activities of the antioxidant enzymes were increased in the leaves of Ponkan with AMF inoculation compared with those of Ponkan without AMF inoculation under high temperature and drought stress. The results demonstrated that Ponkan growth was inhibited, and the photosynthetic and antioxidant capacities was reduced in the the leaves of Ponkan without AMF inoculation, while the capacities were effectively improved in the leaves of Ponkan with AMF inoculation under high temperature and drought stress. Therefore, we conclude that the higher photosynthetic and ROS scavenging capacities in the leaves of Ponkan with AMF inoculation alleviate the physiological damage of the plants under high temperature and drought stress. Reference | Related Articles | Metrics | Comments（0）

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Textual Research on the Basic Source of Chenpi and a Brief Introduction to the Planting History of Medicinal Material WANG Ya-rong, FAN Qiang, WU Hong, WANG Jian-song, LIAO Wen-bo Subtropical Plant Science    2023, 52 (5): 453-464.   DOI: 10.3969/j.issn.1009-7791.2023.05.011 Abstract （97）      PDF（pc） （6170KB）（835）       Knowledge map    Save Chenpi is a famous traditional Chinese medicine. Its medicinal materials are dried and mature pericarps of the Rutaceae plant Citrus reticulata Blanco and its cultivated varieties. In this paper, the source of dried tangerine peel was studied by consulting ancient herbal books and combining with the relevant research in modern times, including the source plants, origin and planting history, the analysis of effective components and efficacy, and the study of genetic relationship at the molecular level. "Guangchenpi" produced in Guangdong Province, is the best-dried tangerine peel, and "Xinhui Chenpi (C. reticulata cv. Chachiensis)" produced in Xinhui District of Guangdong Province, is the traditional authentic medicinal material in China, which is a national geographical indication product with excellent quality. The old use of orange peel began in the Liang Dynasty, flourished in Ming and Qing dynasties, and spread to modern times. The Ming Dynasty put forward that "the Chenpi produced in Guangzhong is the best" and emphasized the authenticity of Guangchenpi. There are many kinds of dried tangerine peel, and there are great differences in the content of total flavonoids. Besides hesperidin, polymethoxy brass compounds and volatile oils peculiar to Rutaceae plants can distinguish different sources of dried tangerine peel well, so it is suggested to add the next edition of China Pharmacopoeia as one of the quality control indicators. C. reticulata cv. Kinokuni, C. reticulata cv. Nian Ju, C. reticulata cv. Ponkan etc. have little difference with C. reticulata cv. Chachiensis in the content of flavonoids and polysaccharides, which can be used as effective planting resources for the dried tangerine peel. China's abundant wild citrus resources have strong resistance and adaptability to habitats, which is an important basis for breeding new varieties. Therefore, targeted protection, development, and utilization research should be strengthened. The textual research results of this paper can provide a basis for the further development and utilization of Guangchenpi and tangerine peel. Reference | Related Articles | Metrics | Comments（0）

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Research Progress of PAL Gene and Its Function in Medicinal Plants WANG Ruo-xian, ZHU Rui-yan, KAI Guo-yin, SHI Min Subtropical Plant Science    2024, 53 (2): 181-190.   DOI: 10.3969/j.issn.1009-7791.2024.02.012 Abstract （97）      PDF（pc） （10616KB）（58）       Knowledge map    Save The phenylalanine metabolic pathway is a key metabolic pathway in plants, producing compounds such as flavonoids, phenolic acids, and lignans. These substances not only regulate plant growth, development, and stress resistance, but also employ in the prevention and treatment of diseases, which are major factors in determining the quality of medicinal plants. Phenylalanine ammonia-lyase (PAL) is the catalyst for the first reaction in the phenylalanine metabolic pathway and is the key and rate-limiting enzyme of this pathway. This review examines the fundamental features, control of expression of the PAL gene in medicinal plants, which serves as a foundation for further understanding the role of PAL in medicinal plants. Reference | Related Articles | Metrics | Comments（0）

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Diversity of Understory Herbaceous Plants in Urban Forest Communities and Their Environmental Responses —the Case of Guiyang City CAI Hong-li, OU Jing Subtropical Plant Science    2023, 52 (5): 434-447.   DOI: 10.3969/j.issn.1009-7791.2023.05.009 Abstract （96）      PDF（pc） （3252KB）（224）       Knowledge map    Save Understory herbaceous plants are an important component of forest communities, and are important for maintaining the function and diversity of forest ecosystems. This study analyzed the relationship between the composition and diversity of herbaceous plants and environmental factors based on the data from 1320 understory samples (1 m×1 m) from 44 typical forest community sample plots in Guiyang City. The results showed that (1) there were 257 species of understory herbaceous plants in the study area, belonging to 186 genera in 67 families, including 226 species of seed plants, with perennial herbs as the dominant taxa (69%). Asteraceae, Gramineae, Liliaceae and Labiatae dominated. (2) A total of eight environmental factors explained 20.2% of the variation in the composition of understory herbaceous plants in Guiyang City, and stand type and elevation were the main environmental factors affecting species composition and distribution. (3) The diversity of understory herbaceous plants in different stand types was, in descending order, mixed coniferous-broadleaf forests, mixed broadleaf forests, broadleaf-only forests, mixed coniferous forests, and coniferous-only forests. The Margalef index was significantly correlated with stand type and slope direction. The Shannon-Wiener index was significantly correlated with stand type, apomictic thickness, slope direction, and slope elevation. And the Simpson index, Pielou index were significantly correlated with stand type, apoplastic thickness, and slope position. (4) Multiple regression equations showed that Margalef index was mainly affected by stand type and slope direction, Shannon-Wiener index was mainly affected by stand type, Simpson index was mainly affected by stand type and slope position, and Pielou index was mainly affected by apomictic thickness, slope position and elevation. Therefore, the joint effect of stand type, apoplastic thickness, slope direction, slope position and elevation could better explain the variation of understory herbaceous plant species diversity in the study area. Reference | Related Articles | Metrics | Comments（0）

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New Records of Seed Plants from Guangdong Province Ⅴ ZENG Qiu-gen, YANG Ling-han, LIAO Li-juan, ZHAO Wen-sheng, ZHANG Ming-kai, ZENG You-hong, LIN Hong, JIA Xin-yu, GUO Jian-qiang, FAN Qiang Subtropical Plant Science    2024, 53 (2): 175-180.   DOI: 10.3969/j.issn.1009-7791.2024.02.011 Abstract （95）      PDF（pc） （10638KB）（94）       Knowledge map    Save Five species, Scutellaria tenera C. Y. Wu & H. W. Li, Scutellaria axilliflora Hand.-Mazz, Paraphlomis seticalyx C. Y. Wu ex H. W. Li, Salvia sinica Migo and Tricyrtis viridula Hir. Takah., were reported as new records in Guangdong Province, China. All of them were discovered in northen Guangdong province. The discovery of these new records enriched the germplasm resources of Guangdong Province. Reference | Related Articles | Metrics | Comments（0）

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Effect of Phosphorus Reduction on Growth, Yield and Quality of Astragalus membranaceus LI Cong, MAO Yao-jie, JIN Xiao-jun Subtropical Plant Science    2024, 53 (2): 128-136.   DOI: 10.3969/j.issn.1009-7791.2024.02.005 Abstract （94）      PDF（pc） （712KB）（587）       Knowledge map    Save The effects of phosphorus reduction on the growth, physiology, yield and quality of Astragalus mongolicus were studied to provide scientific basis for its fertilization and cultivation. The growth, physiology, yield and quality indexes were measured by setting 4 phosphorus application levels. Results showed that phosphorus reduction by 25% treatment (P2) had a significant effect of on growth, yield and quality of A. membranaceus. The seedling emergence rate, leaf area, root length, root diameter, fresh biomass, dry biomass, carotenoids, SOD activity, POD activity, CAT activity, economic benefit and glucosinolate of acacia catechu exhibited significantly increased by 6.76%, 3.32%, 6.76%, 18.01%, 2.13%, 3.80%, 26.00%, 7.12%, 12.04%, 3.90%, 10.72% and 13.47% respectively, compared to the full phosphorus application treatment. There were no significant differences in stem diameter, chlorophyll a, chlorophyll b, fresh yield, dry yield, drying rate, first grade rate, total ash, extract, polysaccharide and astragaloside, compared with total phosphorus application. Reference | Related Articles | Metrics | Comments（0）

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Application of Horticultural Therapy to Improvement of College Students' Psychological Quality GUO Can-li, XIE Han, WANG Li-xian, LI Dong-ze Subtropical Plant Science    2024, 53 (1): 72-79.   DOI: 10.3969/j.issn.1009-7791.2024.01.011 Abstract （94）      PDF（pc） （531KB）（154）       Knowledge map    Save This paper explores the benefits of alleviating college students' mood and improving their psychological quality, expected to provide reference for the popularization and application of horticultural therapy in colleges and universities. Through 10 types of horticultural activities, and the POMS scale and satisfaction survey were used for quantitative and qualitative analysis. The results indicate that the mood state TMD of participants in 10 horticultural activities decrease, with an average decrease of 12.68; Activities such as plant recognition, leaf vein bookmarking, plant sowing, plant rubbing, succulent planting, and sachet making can significantly improve the negative emotions of college students; Various horticultural activities have a good effect on improving specific mood states such as fatigue (2.50), depression (2.05), and tension (1.91). Among them, plant rubbing activities have the best effect and can significantly improve 6 mood states; The average overall satisfaction evaluation of various horticultural activities is 8.10, indicating a good overall evaluation, with higher satisfaction rates for sachet making and succulent planting. This study indicates that each horticultural activity has a certain improvement effect on the participants' emotions. Plant recognition, plant sowing, succulent cultivation, and sachet making improve the participants' psychological status well, conclusion that horticultural therapy can improve the psychological quality of college students to a certain extent. It is feasible to apply horticultural therapy to college students' mental health education. Reference | Related Articles | Metrics | Comments（0）

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Current Status and Hotspot Analysis of Wildlife Conservation Research Based on CiteSpace in China ZHAN Hui-ying, XIE Ting-ting, HUANG Liang, YU Ding-kun, WU Jian-dong, HUANG Sha, LIU Jun Subtropical Plant Science    2024, 53 (2): 160-168.   DOI: 10.3969/j.issn.1009-7791.2024.02.009 Abstract （93）      PDF（pc） （14438KB）（34）       Knowledge map    Save Using bibliometric software CiteSpace, a visual analysis of the theme of wildlife conservation was conducted to provide the latest hotspots and research directions for wildlife studies. Based on the CNKI database, a journal literature analysis was performed, and 1139 standard articles were visually analyzed for publication volume, publishing institutions, authors, co-occurrence of keywords, clustering, and burst analysis. The results showed that the overall publication volume in the field of wildlife conservation showed an increasing trend, with forestry-related journals ranking high in publication volume. Domestically, attention to wildlife conservation was particularly high around the time of revising conservation laws. Core research institutions were closely interconnected, forming seven large collaborative networks among researchers. Over time, research on the keyword "wildlife" had persisted. In the early stages, the researches in this field mainly focused on the ecological environment. With the introduction of the concept of harmonious coexistence between humans and nature, societal attention and protection towards wildlife had increased. The emphasis on the survival environment of wildlife, particularly in natural protected areas, was gradually growing. Combining wildlife conservation with research on nature reserves and further exploring conservation strategies and measures, predicting conservation directions, can better address threats to nature and wildlife. Reference | Related Articles | Metrics | Comments（0）

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Effects of Soil Amendments on Soil Environment and Baby Bok Choy Quality WEI Jin-yi, WANG Ming-yuan, TANG Yi, WANG Zi-shu, YANG Chen-yi Subtropical Plant Science    2024, 53 (1): 40-45.   DOI: 10.3969/j.issn.1009-7791.2024.01.005 Abstract （92）      PDF（pc） （642KB）（325）       Knowledge map    Save In order to explore the effects of soil amendments on the soil environment, quality and yield of the Baby Bok Choy, the soil amendments developed by our laboratory were used as materials, and soil pH, organic matter content and the internal and external quality of ‘Xiaobaimiao’ cabbage were studied. Four treatments were designed as follows: no soil amendments (CK), and application of the soil amendments 25 kg (B25), 50 kg (B50) and 75 kg (B75) per 667 m2 of vegetable garden. The results showed that the application of soil amendments could maintain soil pH 7.0 above and improve soil acidification. The organic matter content in different soil layers decreased with the deepening of the soil layer. In the soil layer of 31–45 cm, the highest organic matter content was observed in the B25 treatment, which was 5.35 g·kg–1, significantly higher than that in the CK group (P<0.05); soil amendments could increase the content of Vᴄ, soluble protein, and free amino acids in the Baby Bok Choy, while reducing nitrate content. Among them, under B75 treatment, the content of Vᴄ, soluble protein, and free amino acids was the highest, significantly different from the CK group (P<0.05), and the nitrate content was the lowest, 0.4713 mg·g–1, significantly different from other treatments (P<0.05). Moderate application of soil amendments could increase the length, width, and number of leaves of the Baby Bok Choy, and improve its external quality. Under B25 and B50 treatments, the fresh weight of the Baby Bok Choy above ground increased by 79 g and 16 g compared to the CK group, respectively, with significant differences (P<0.05). The application of soil amendments can improve the yield and quality of the Baby Bok Choy, and improve the soil environment. Reference | Related Articles | Metrics | Comments（0）

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Physiological Response of Prunus pseudocerasus × incisa to High Temperature Stress HONG Zhi-meng, XIA Si-ying Subtropical Plant Science    2023, 52 (5): 398-403.   DOI: 10.3969/j.issn.1009-7791.2023.05.004 Abstract （91）      PDF（pc） （895KB）（82）       Knowledge map    Save In this paper, five temperature levels of 25 ℃, 30 ℃, 35 ℃, 40 ℃ and 45 ℃ were selected. Each temperature level was treated for 2 h, 4 h, 6 h and 8 h, respectively. The physio-biochemical changes of leaves under temperature stress were determined to explore the effects of temperature stress on physiological response of Prunus pseudocerasus × incisa. The results showed that the chlorophyll content decreased first and then increased as the stress temperature increased, and the SOD activities, the contents of MDA and the soluble protein increased first and then decreased. CAT, POD activities showed an upward trend. The contents of chlorophyll, soluble protein, soluble sugar, MDA, and POD, SOD activities were presented significant differences along with the duration of stress prolongs under the same temperature stress. By means of principal component analysis showed that POD activity, SOD activity, and contents of chlorophyll, soluble protein and soluble sugar were the main physiological index to high temperature stress. Reference | Related Articles | Metrics | Comments（0）

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Effects of Different Concentrations of Melatonin Treatment on the Hardness and Pectin of Postharvest……… Blueberry Fruits SUN Meng-meng, TAO Le-ren Subtropical Plant Science    2023, 52 (6): 475-480.   DOI: 10.3969/j.issn.1009-7791.2023.06.002 Abstract （89）      PDF（pc） （698KB）（790）       Knowledge map    Save In response to the issues of difficult storage and decreased hardness of blueberries after picking, this experiment used blueberries as materials and treated them with different concentrations of melatonin (0, 50, 100, and 150 mg·L–1). The hardness, pectin content, pectin methylesterase (PME) activity, polygalacturonase (PG) activity, pectin lyase (PL) activity, β-galactosidase (β-GAL) activity, degree of pectin methylation, β-eliminating reaction degree, H2O2 and malondialdehyde (MDA) content were measured to explore the mechanism of melatonin's effect on blueberry fruit preservation. The results showed that different concentrations of melatonin treatment could delay the decrease of blueberry hardness, but the effect was not significant when the treatment concentration was low (50 mg·L–1). The 150 mg·L–1 melatonin treatment had the best preservation effect on blueberry fruit, maintaining pectin content and inhibiting PG, PL, PME, and β-GAL activity of cell wall degrading enzymes, reducing the demethylation of pectin. These results indicated that melatonin could delay the degradation of cell wall polysaccharides by inhibiting enzyme activity, which was feasible for post harvest preservation of blueberry fruits. Reference | Related Articles | Metrics | Comments（0）

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Construction of LM-BP Neural Network Prediction Model for the Softness of Flue-cured Tobacco Leaves Based on Fresh Leaf Appearance Parameters LIU Shun-qi, LIU Qiang, PAN Hong, ZHANG Hong-fei, KUANG Peng-fei, AI Fu-qing Subtropical Plant Science    2024, 53 (2): 152-159.   DOI: 10.3969/j.issn.1009-7791.2024.02.008 Abstract （89）      PDF（pc） （966KB）（54）       Knowledge map    Save In order to predict the softness of tobacco leaves by using the appearance parameters of fresh tobacco leaves, a LM-BP neural network prediction model was established by studying the relationship between the field ripening appearance parameters such as lightness and darkness (L), redness value (a), yellowness value (b), color saturation (C), hue angle (H), SPAD value, etc. and the softness of post-roasted leaves of YUNYU 87 with different retention numbers of the upper leaves. The results showed that the appearance characteristic parameters of upper leaves with different numbers of retained leaves were different, and the softness of tobacco leaves after baking was also different, and the value of softness after baking was lower in the number of retained leaves of 19 leaves than that in the number of leaves of 16-18 leaves, which ranged from 5.62 to 13.29 mN; There was a correlation between the parameters of tobacco appearance characteristics and the softness of post-roasted tobacco; stepwise regression analysis screened out the factors with greater influence on the softness of post-roasted tobacco as the number of retained leaves, L, H and SPAD value; The LM algorithm was used to replace the gradient algorithm to create the LM-BP neural network prediction model, and the training results showed that the prediction accuracy R2 was close to 1, the average absolute percentage error MAPE<5%, and the root-mean-square error RMSE<2. Properly retaining more leaves increases the softness of the tobacco after roasting; There was a correlation between the maturation appearance characteristics of tobacco leaves in the field and the softness of the tobacco after roasting; The LM-BP neural network was used to create a prediction model with high accuracy, which can be used for intelligent judgement of tobacco maturity in the field. Reference | Related Articles | Metrics | Comments（0）

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Four Newly Recorded Species of Orchidaceae in Qinghai Province RAO Wen-hui, WANG Mei-na, CHEN Jian-bin, ZHANG De-ning, LI Jian, KONG De-min, WU Xin-yi, ZHANG Cheng, ZHANG Sheng-bang Subtropical Plant Science    2024, 53 (4): 373-376.   DOI: 10.3969/j.issn.1009-7791.2024.04.011 Abstract （88）      PDF（pc） （9036KB）（252）       Knowledge map    Save This paper reported four newly recorded species of Orchidaceae in Qinghai, China, including Gymnadenia conopsea (L.) R. Br., Neottia puberula var. maculata (Tang & F. T. Wang) S. C. Chen, S. W. Gale & P. J. Cribb, Platanthera minutiflora Schlechter, Platanthera urceolata (Hook. f.) R. M. Bateman. These new records have enriched the diversity of Orchidaceae in Qinghai province, and have certain significance to the study of flora in the future. Reference | Related Articles | Metrics | Comments（0）

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New Data of Salvia from Zhejiang Province LI Jun-ping, ZHANG Pei-lin, ZHONG Jian-ping, ZHU Yi-rong, XU Liang-dong, ZHU Hao-dong, XIE Wen-yuan Subtropical Plant Science    2024, 53 (1): 60-63.   DOI: 10.3969/j.issn.1009-7791.2024.01.008 Abstract （87）      PDF（pc） （276KB）（291）       Knowledge map    Save The classification below Salvia sinica Migo (Lamiaceae) was studied in this paper. The form rake of S. sinica f. purpurea H. W. Li was restored, and S. sinica f. flaviflora J. P. Li, Y. R. Zhu et Z. H. Chen, as a new form from Zhejiang Province was reported. The voucher specimens were deposited in Zhejiang Museum of Natural History (ZM). Reference | Related Articles | Metrics | Comments（0）

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Research Advances in Metabolic Regulation, Storage and Transport of Carotenoids in Plants YU Yin-feng, LIU Qing-qing, LIU Xiao-chun, ZHANG Da-sheng, CUI Li-jie Subtropical Plant Science    2024, 53 (1): 80-88.   DOI: 10.3969/j.issn.1009-7791.2024.01.012 Abstract （86）      PDF（pc） （367KB）（6660）       Knowledge map    Save Carotenoids are a group of natural pigments widely found in plants, which are generally composed of C40 terpenoids and their derivatives, which are connected from end to end of 8 isoprene units. In plants, carotenoids not only make plant organs appear color, but also perform important biological functions. In recent years, although the biosynthesis pathway of carotenoids is relatively clear, the mechanisms of metabolic regulation, including storage and transport of carotenoids in vivo are not yet understood. This paper briefly summarized the research progress of the biosynthesis, storage localization of carotenoids and terpenoid transporters, and focused on the potential substances that mediate carotenoid transport and the methods of identifying carotenoid transporters, in order to provide a better understanding of carotenoid synthesis and transportation. Reference | Related Articles | Metrics | Comments（0）

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Mechanism of Traditional Chinese Medicine Genkwa Flos for Treatment of Primary Dysmenorrhea Based on Network Pharmacology and Molecular Docking LI Si-meng, TIAN Rong, YIN Ming-jing, GU Wei Subtropical Plant Science    2024, 53 (1): 31-39.   DOI: 10.3969/j.issn.1009-7791.2024.01.004 Abstract （86）      PDF（pc） （470KB）（234）       Knowledge map    Save The effective material basis and potential mechanism of Genkwa Flos in treating primary dysmenorrhea by network pharmacology and molecular docking techniques were studied. Based on the TCMSP database, the active substances and targets of Genkwa Flos were predicted, and the targets related to primary dysmenorrhea were obtained with the help of DisGeNET and other databases. Based on the intersection targets of Genkwa Flos and primary dysmenorrhea, the intersection target protein interaction network was constructed using the STRING database, and the “Genkwa Flos-active substances-target-primary dysmenorrhea” network was constructed using Cytoscape3.7.2. Gene ontology (GO) and Kyoto encyclopedia of genes and genomes (KEGG) pathway enrichment analysis were performed using the DAVID database, and molecular docking of the core targets and corresponding active ingredients was performed using Autodock tools. Results showed that the core active substances of Genkwa Flos for treating primary dysmenorrhea are Genkwanin, (2R)-5,7-dihydroxy-2- (4-hydroxyphenyl) chroman-4-one, 7-hydroxy-6-methoxy-3,7’-dicoumarin, Gentiacaulein, Hydroxygenkwanin, kaempferol, luteolin, sitosterol, 9-hydroxyglabratolide; key targets include ESR1, PTGS1, PTGS2, GSTM1, CYP1A1, OPRM1, NTRK2 and NR1H2; the associated biological processes are mainly related to aging, positive regulation of nitric oxide biosynthetic process, cytoplasm and ATPase binding; thepathway of KEGG are mainly enriched in the pathogenesis of cancer, chemical carcinogenesis-receptor activation, and chemical carcinogenesis- DNA adducts. In addition, molecular docking shows that the docking energy values between the core active ingredient Genkwanin and the key target proteins are all less than –7.0 kcal·mol–1, which have strong binding activity and can form stable structural conformations. This study used network pharmacology and molecular docking methods to preliminarily explore the active material basis of Genkwa Flos for treating primary dysmenorrhea from the perspective of “Chinese medicine-ingredient-target-disease”, laying a foundation for further studying the mechanism of action of this kind of ingredients for treating dysmenorrhea. Reference | Related Articles | Metrics | Comments（0）

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Identification and Expression Analysis of PYL Gene Family in Eriobotrya japonica LIN Qiu-xiang, HAN Yu-xin Subtropical Plant Science    2024, 53 (1): 1-11.   DOI: 10.3969/j.issn.1009-7791.2024.01.001 Abstract （84）      PDF（pc） （452KB）（1351）       Knowledge map    Save Abscisic acid (ABA) is one of the important hormones regulating plant growth and development, and abiotic stress. As an ABA receptor, PYL is located at the top of its signaling pathway and plays a core regulatory role. However, this gene family has not been identified and analyzed in detail in loquat. In this study, 12 PYL genes were identified in loquat based on bioinformatics analysis. The molecular weight of the coding PYL protein ranged from 10.47 to 29.12 kDa, and most of them were localized in the cytoplasm. PYL family genes were distributed on 8 chromosomes. Phylogenetic tree analysis showed that PYL gene family could be divided into three subfamilies and EjPYL1 was closely related to AtPYL13. PYL proteins in loquat were consisted of motif 1-6, and motif3 was the common domain. Genes of PYL family were collinearity in species loquat. There were 2 pairs of collinearity between loquat and Arabidopsis thaliana. Cis-components in promoter of PYL genes were related to low temperature, drought, light and hormone response. RNA-seq of loquat young fruits indicated that EjPYL6 and EjPYL8 were both up-regulated by low temperature in fruit pulp and seeds. This study can provide theoretical basis for further understanding ABA signal transduction pathway and breeding new varieties of loquat with frost resistance. Reference | Related Articles | Metrics | Comments（0）

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Calyptocarpus, a Newly Naturalized Genus of Asteraceae in Guangdong HE Chun-mei, TONG Yi-hua Subtropical Plant Science    2024, 53 (1): 68-71.   DOI: 10.3969/j.issn.1009-7791.2024.01.010 Abstract （83）      PDF（pc） （345KB）（127）       Knowledge map    Save This paper reported a newly naturalized genus of Asteraceae, Calyptocarpus Less. in Guangdong. Calyptocarpus vialis Less. is native to the southern United States, Mexico and Cuba, and was previously reported to be naturalized in China (Taiwan, Yunnan and Guangxi), Indonesia (Java), Oceania, India and Africa. Many populations of this invasive species were discovered in Chebei Chong, Guangzhou. It grows vigorously and tends to take over the habitat of other native herbaceous plants, which seems to be an invasive species and should attract the attention of relevant departments. Calyptocarpus vialis is similar to Synedrella nodiflora (L.) Gaertn., but markedly differs by having prostrate stems, homogeneous achenes with wingless ray ones, and palea with an acute apex. The vouchers are deposited in the herbarium of South China Botanical Garden, Chinese Academy of Sciences (IBSC). Reference | Related Articles | Metrics | Comments（0）