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30 April 2024, Volume 53 Issue 2 Previous Issue   
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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 2024, 53(2): 89-99.  DOI: 10.3969/j.issn.1009-7791.2024.02.001 Abstract ( )   PDF (948KB) ( )   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. References | Related Articles | Metrics

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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 2024, 53(2): 100-112.  DOI: 10.3969/j.issn.1009-7791.2024.02.002 Abstract ( )   PDF (3264KB) ( )   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. References | Related Articles | Metrics

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Physiological Characteristics of Flower Bud Differentiation in Erythrina sykesii under Drought Stress LIU Bei-ning, CHEN Fa-xing 2024, 53(2): 113-119.  DOI: 10.3969/j.issn.1009-7791.2024.02.003 Abstract ( )   PDF (597KB) ( )   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. References | Related Articles | Metrics

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Effects of Drought Stress on Flower and Leaf Traits and Antioxidant Enzyme Activities of Gardenia jasminoides CHEN Qing-hai 2024, 53(2): 120-127.  DOI: 10.3969/j.issn.1009-7791.2024.02.004 Abstract ( )   PDF (1988KB) ( )   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. References | Related Articles | Metrics

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Effect of Phosphorus Reduction on Growth, Yield and Quality of Astragalus membranaceus LI Cong, MAO Yao-jie, JIN Xiao-jun 2024, 53(2): 128-136.  DOI: 10.3969/j.issn.1009-7791.2024.02.005 Abstract ( )   PDF (712KB) ( )   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. References | Related Articles | Metrics

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Comprehensive Evaluation of Cold Resistance of 12 Grape Rootstock Cultivars Branches CHANG Qiang, ZHU Yan-fang, GAO Bo, HAO Yan 2024, 53(2): 137-142.  DOI: 10.3969/j.issn.1009-7791.2024.02.006 Abstract ( )   PDF (856KB) ( )   In order to provide scientific basis for the introduction of excellent cold-resistant rootstocks in Gansu, the branches of 12 grape rootstock varieties treated with artificial simulated low temperature were used as test materials, and the relative conductivity, proline, malondialdehyde, soluble sugar and soluble protein contents of the branches were determined. The relative conductivity combined with the Logistic equation was used to predict the half-lethal temperature (LT50) of each variety, and the subordinate function method was applied to make a comprehensive evaluation of the cold resistance of grape rootstocks. The results showed that the relative conductivity, soluble protein, soluble sugar, malondialdehyde, and free proline contents of the branches of each grape rootstock increased gradually, and the calculated half-lethal temperatures (LT50) ranged from -16.32 ℃ to -24.84 ℃; and the results of the comprehensive evaluation showed that the strengths of cold resistance of 12 grape varieties rootstocks were in the order of Beda, Shanhe 2, 101-14, 5BB, 188-08, SO4, Valliant, 3309, 1103P, Du Lot, BRNo.2, 110R. References | Related Articles | Metrics

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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 2024, 53(2): 143-151.  DOI: 10.3969/j.issn.1009-7791.2024.02.007 Abstract ( )   PDF (1355KB) ( )   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. References | Related Articles | Metrics

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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 2024, 53(2): 152-159.  DOI: 10.3969/j.issn.1009-7791.2024.02.008 Abstract ( )   PDF (966KB) ( )   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. References | Related Articles | Metrics

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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 2024, 53(2): 160-168.  DOI: 10.3969/j.issn.1009-7791.2024.02.009 Abstract ( )   PDF (14438KB) ( )   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. References | Related Articles | Metrics

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A new Record of Sarcogyne from China FENG Lei, FENG Rui-yi, SONG Xiao-hua, ZHANG Lu-lu 2024, 53(2): 169-174.  DOI: 10.3969/j.issn.1009-7791.2024.02.010 Abstract ( )   PDF (5354KB) ( )   In order to investigate the species diversity of lichenized fungi in Kunyu Mountain, Shandong Province, identification was carried out using morphological, chemical and phylogenetic analyses. Sarcogyne endopetrophila Tokizawa & Y. Ohmura was found as a newly recorded species from China. It is characterized by endolithic thalli, small lecideoid apothecia with dark-red to black discs lacking pruina, indistinct subhymenium, pale brown and thick hypothecium, verrucose to globose pycnidia and ellipsoid conidia. Detailed taxonomic description and photos as well as a key to all known Chinese Sarcogyne species were provided. References | Related Articles | Metrics

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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 2024, 53(2): 175-180.  DOI: 10.3969/j.issn.1009-7791.2024.02.011 Abstract ( )   PDF (10638KB) ( )   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. References | Related Articles | Metrics

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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 2024, 53(2): 181-190.  DOI: 10.3969/j.issn.1009-7791.2024.02.012 Abstract ( )   PDF (10616KB) ( )   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. References | Related Articles | Metrics