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28 February 2023, Volume 52 Issue 1 Previous Issue    Next Issue
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Plant physiology, biochemistry and molecular biology
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Plant physiology, biochemistry and molecular biology

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Effects of Drought Stress on Physiological and Biochemical Characteristics and NtDEGP5 Gene Expression SHU Yan-qi, LUO Jia-jun, JIA Rong-li, DUAN Li-li, MO Ze-jun, LIU Ren-xiang 2023, 52(1): 1-8.  DOI: 10.3969/j.issn.1009-7791.2023.01.001 Abstract ( )   PDF (859KB) ( )   To study the effects of drought stress on physiological and biochemical characteristics and the differential expression of NtDEGP5 gene in different tobacco cultivars, drought resistant variety NC82 and drought sensitive Yunyan 87 were used as materials, and PEG-6000 was used to treat seedlings with drought stress. Fv/Fm, SOD activity, POD activity, MDA content and NtDEGP5 relative expression of two tobacco cultivars were determined after treatment, so as to provide a basis for further research on the function of NtDEGP5 gene. The results showed that drought stress had effects on Fv/Fm, SOD activity, POD activity and MDA content of tobacco seedlings. As the drought continued, Fv/Fm showed a gradual decline trend, while POD, SOD activity and MDA content showed a trend of first increasing and then decreasing. The response of different varieties to drought stress was different. Under drought stress for 0 to 9 hours, the Fv/Fm of Yunyan 87 seedlings decreased more than that of NC82, while the POD, SOD activity and MDA content increased less than that of NC82. The difference was not significant after 12 hours of drought stress. Under drought stress, the expression of NtDEGP5 was different among varieties and organs. The expression levels in roots, stems and leaves of Yunyan 87 seedlings were very low, and that in roots of NC82 seedlings was also very low, but it was high in leaves and stems after treatment for 9–12 h. NtDEGP5 expression in leaves of NC82 was positively correlated with Fv/Fm, POD activity and MDA content. The results showed that Fv/Fm, SOD activity, POD activity and MDA content could be used as drought resistance evaluation indicators of tobacco seedlings. NtDEGP5 gene expression was significantly correlated with drought resistance evaluation indicators. It was speculated that NtDEGP5 had drought resistance function. References | Related Articles | Metrics

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Effects of Aluminum on the Absorption of Nutrients and Enzyme Activity of Ectomycorrhizal Fungi LI Kuai-fen, LIU Hai-yan 2023, 52(1): 9-17.  DOI: 10.3969/j.issn.1009-7791.2023.01.002 Abstract ( )   PDF (686KB) ( )   Effects of treatment on biomass, pH, nutrient uptake, antioxidant enzyme activity, and MDA content of Suillus luteus (Sl), Suillus bovines (Sb) and Suillus placidus (Sp) were tested by liquid culture with different concentrations of Al3+ (0, 0.2, 0.4, 0.8, 1.2 and 1.6 mmol·L–1). The results showed that aluminum treatment significantly increased the biomass, P content, and Al content of the three strains, and decreased the pH in the culture medium. When the concentration of Al3+was 0.8 mmol·L–1, the biomass increase in the strain was the largest, and the aluminum content of the three strains treated with Al3+at various concentrations was Sp>Sb>Sl; The potassium content showed a trend of first increasing and then decreasing as the concentration of Al3+ increased. Low concentration of Al3+ (≤0.4 mmol·L–1) significantly promoted the accumulation of nitrogen in the Sl strain, and the treatment with 0.4 mmol·L–1 Al3+ increased by 42.65% compared to the treatment without aluminum. Aluminum treatment also significantly decreased the POD and SOD activities of the strain, and increased the MDA content of the strain. The biomass of the strain was significantly positively correlated with the N, P, and K content of the mycelium (P<0.01), with the highest correlation with P content (r=0.635). To sum up, the concentration of Al3+ in the environment is a key factor affecting the absorption of aluminum by ectomycorrhizal fungi. At a certain concentration of Al3+, ectomycorrhizal fungi can increase the absorption of nutrient elements N, P, and K, improve the activity of mycelial enzymes, reduce the content of MDA, alleviate aluminum toxicity, and enhance their viability under aluminum stress, providing a theoretical basis for screening excellent strains with strong resistance (or tolerance) to aluminum. References | Related Articles | Metrics

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Effect of Different Nitrogen and Phosphorus Concentrations on Closterium leibleinii Growth and Fat Soluble RUAN Ye-ye, LIN Xiong-ping, WENG Qing, HE Zi-hong, LIN Hao, ZHANG Zhi-ying 2023, 52(1): 18-22.  DOI: 10.3969/j.issn.1009-7791.2023.01.003 Abstract ( )   PDF (509KB) ( )   In this experiment, Closterium leibleinii was used as the test material to study the growth and lipid-soluble content of C. leibleinii cultured at different nitrogen and phosphorus concentrations to provide basic information for the development of C. leibleinii as biodiesel. The results showed that the optimum nitrogen concentration was 5.30 mg·L–1 for the growth of C. leibleinii, with the maximum growth rate 3.675×106 cell·L–1·d–1; the optimum phosphorus concentration was 0.02 mg·L–1 with the maximum growth rate 4.05×105 cell·L–1·d–1. The crude lipid accounted for 88.04% of the dry weight of the algae at the optimum NP concentration-BG11. It was concluded that C. leibleinii had a high growth rate and high lipid-soluble material in the medium with optimum nitrogen and phosphorus, and could be developed and utilized as a promising biodiesel. References | Related Articles | Metrics

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Induction of Tobacco Resistance to Alternaria alternata by Two Plant Growth Regulators GUO Juan, PENG Jian-tao, LONG Xiao-fu, YANG Qian 2023, 52(1): 23-31.  DOI: 10.3969/j.issn.1009-7791.2023.01.004 Abstract ( )   PDF (3323KB) ( )   In order to explore the effects of plant growth regulators on the metabolism of antioxidant enzymes and polyphenols of tobacco, the mycelia growth of Alternaria alternate, under treatment with different concentrations of methyl jasmonate (MeJA) and salicylic acid (SA), the defense enzyme activities and polyphenol contents in tobacco mature leaves inoculated with and uninoculated with A. alternata were measured. The results showed that 1 mmol·L–1 MeJA had the best inhibitory effect on A. alternata, and the inhibitory rate was more than 59%, followed by 3.5 mmol·L–1 SA. The inhibitory effect of MeJA and SA on A. alternata was enhanced with the increase of growth regulator concentration. The treatment with 0.1 mmol·L–1 MeJA and 2.5 mmol·L–1 SA could induce SOD, POD and CAT defense enzymes activities in tobacco, and reduce H2O2 reactive oxygen content, while MeJA had better induction effect. Treatment with the two plant growth regulators and inoculating with the A. alternata could induce and improve the activities of PPO and PAL in tobacco leaves, which were related to polyphenol metabolism, but had little effect on tobacco polyphenols. The top three polyphenols with high content in mature tobacco leaves were chlorogenic acid, rutin and cryptochlorogenic acid. References | Related Articles | Metrics

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Effect of Shading on Growth and Protective Enzyme Activities of Tutcheria championi Seedlings WEN Shan-na, TIAN Xue-qin, CHEN Xue-mei, XUE Ke-na, HE Jian-qiang 2023, 52(1): 32-37.  DOI: 10.3969/j.issn.1009-7791.2023.01.005 Abstract ( )   PDF (367KB) ( )   In order to observe the adaptability of Tutcheria championi seedlings to shading environment, using full light (no shading) as control, the influence on the growth and physiological characteristics of two-year T. championi seedlings were investigated under the conditions of 30%, 50% and 70% shading. The results showed that the seedlings under full light was stronger than the other treatments, the seedling height, ground diameter were higher than the seedlings under shading treatments. The total biomass, root mass ratio and root shoot ration of seedlings under full light were significantly higher than seedlings under shading treatments. The chlorophyll content of seedling leaves under 50% shading was significantly higher than that under full light and 70% shading (P<0.05), and there was no significant difference in chlorophyll a/b value among all treatments. There were no significant differences in malondialdehyde (MDA) content and superoxide dismutase (SOD) activity among all treatments (P>0.05). Catalase (CAT) activity was the highest in the 70% shading treatment, which was significantly higher than those of full light and 50% shading treatments (P<0.05). Therefore, sufficient light is good for the growth of T. championi seedlings. References | Related Articles | Metrics

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Diurnal Variation of Photosynthetic Characteristics and Environmental Factors in Tigridiopalma exalata HUANG Jian-rui, LUO Yu-qian, MIAO Shen-yu 2023, 52(1): 38-42.  DOI: 10.3969/j.issn.1009-7791.2023.01.006 Abstract ( )   PDF (435KB) ( )   Portable photosynthesis, transpiration device was applied to the determination of Tigridiopalma exalata photosynthetic characteristics, transpiration characteristics and the diurnal variation of the environmental impact factors. The results showed that the diurnal variation of net photosynthetic rate of T. exalata was a bimodal pattern. The net photosynthetic rate was significantly correlated with photosynthetic active radiation, atmospheric humidity, and transpiration rate. The purpose of this study was to determine the physiological and ecological characteristics of T. exalata, so as to provide data basis for the research on ecological adaptability of T. exalata, and to provide theoretical reference for conservation measures and expansion of breeding scale. References | Related Articles | Metrics

Plant ecology, resources and taxonomy

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Adaptability Analysis of Third Generation Full-sib Chinese Fir Families Based on BLUP Breeding Value and WANG Run-hui, HU De-huo, WEI Ru-ping, YAN Shu, WU Guan-di, HUANG Rong, ZHENG Hui-quan 2023, 52(1): 43-49.  DOI: 10.3969/j.issn.1009-7791.2023.01.007 Abstract ( )   PDF (1581KB) ( )   Cunninghamia lanceolata is an important commercial timber and carbon sequestration tree species in south China. Based on the diameter at breast height (DBH) of 33 third-generation full-sib families of C. lanceolata from Guangdong at multiple tested sites and the multi-site ANOVAs approach, we identified a significant difference (P<0.01) of the genetic adaption in families. While, the site and block effects and the site×family interaction effect seemed to be profound. Regarding this, best linear unbiased prediction (BLUP) based on individual model was carried out to calculate the individual breeding value of the families in each experimental site. The obtained result highlighted the preliminarily separation of the families according to their adaptability and the superior families with higher individual breeding value and adaptability (e.g. families 1, 4, 13 and 31). Further genotype main effect plus genotype-by-environment interaction (GGE) biplot analysis directly gave ‘who won where’ functional diagram, high yield and stable families graph and ideal families selection result that highly agreed with that of BLUP’s, indicating a consistency of these two methods and their forecasting power. References | Related Articles | Metrics

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Prediction of Potential Geographic Distribution of Praxelis clematidea in China Using Random Forest Model ZHANG Hua-wei, LI Zhi-peng 2023, 52(1): 50-59.  DOI: 10.3969/j.issn.1009-7791.2023.01.008 Abstract ( )   PDF (5422KB) ( )   Praxelis clematidea is now causing serious damage to the plant of south of China. By predicting suitable habits in China, scientific basis can be provided for the agricultural and forestry departments to strengthen the prevention and control of P. clematidea. Based on 296 distribution record sites of P. clematidea distributed in China, domestic climate factors and topographic factors, the random forest model and geographic information system (GIS) technology were used to predict its potential habitat areas in China. The predicted results from the random forest model were achievable. The primary environmental factor influencing the distribution of P. clematidea was the minimum temperature in the coldest month, followed by the average annual precipitation, while topographic factors and land use type were less influential. P. clematidea mainly locate in the southern provinces of China, Guangdong, Guangxi, Hainan, Fujian, southern Jiangxi, southwestern Yunnan belonged to the high habitat of P. clematidea, accounting for 8.08% of the national land area; coastal Zhejiang, central Jiangxi, Sichuan, Chongqing junction and other areas belonged to the moderate or general habitat, accounting for 2.32% and 3.37% of the national land area, respectively. Low-suitability and non-suitability zones accounted for 9.09% and 77.14% of the country's land area, respectively. There was no significant change in the total area of P. clematidea suitable zone under the future climate scenario compared with the current stage, but the area of moderate suitable zone increased significantly from 2.32% to 4.33%. In the context of global warming, P. clematidea is not yet at its maximum reproduction range in China, and there is a possibility of its continuous spread. References | Related Articles | Metrics

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Characterization of Leaf Functional Traits of Wikstroemia indica and Its Responses to Soil Factors ZHANG Qun, CHEN Ying, CAO Sheng-xuan, DENG Chuan-yuan 2023, 52(1): 60-66.  DOI: 10.3969/j.issn.1009-7791.2023.01.009 Abstract ( )   PDF (411KB) ( )   In order to explore the characteristics and influencing factors of leaf functional traits of Wikstroemia indica, based on the island vegetation investigation, the leaves of W. indica were sampled and their functional trait indexes were determined. The difference and relationship between leaf functional traits were explored by coefficient of variation method and Pearson correlation analysis, and the response of leaf functional traits of W. indica to soil factors was explored by redundancy analysis. The results showed that the variation coefficient of leaf functional traits of W. indica was from 9.76% to 23.73%, among which the variation degree of leaf volume was the largest (23.73%) and the variation degree of leaf dry matter content was the smallest (9.76%). On the whole, the leaf functional traits of W. indica remained relatively stable. The leaf function traits of W. indica were closely related to each other. The leaf functional characteristics of W. indica were mainly affected by organic matter, total nitrogen and alkaline hydrolyzable nitrogen in the soil. The organic matter, total nitrogen and alkaline hydrolyzable nitrogen in the soil were in direct proportion to the specific leaf area and in inverse proportion to the leaf thickness and leaf volume. The leaves of W. indica can adapt to the changes of external environment through certain character variation and combination to better adapt to the harsh environment of the island. The research results can provide reference for the protection and utilization of wild germplasm resources of W. indica and artificial cultivation. References | Related Articles | Metrics

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Pecteilis cambodiana, a New Record Species of Orchidaceae from China MA Liang, LIN Gui-can, YU Yu-yun, LIU Zhong-jian, LAN Si-ren 2023, 52(1): 67-69.  DOI: 10.3969/j.issn.1009-7791.2023.01.010 Abstract ( )   PDF (1041KB) ( )   Pecteilis cambodiana (Gagnep.) Aver. (Orchidaceae) was reported as a new record from China. Its feature description and color pictures were provided. The voucher specimens were deposited in herbarium of College of Forestry, Fujian Agriculture and Forestry University (FJFC). References | Related Articles | Metrics

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Additions to the Flora of Hong Kong, China ZHU Hui-ling, LIU Jin-gang, WONG Chuk-kwan, Craig WILLIAMS, HANG King-yeung, ZHANG Jin-long, Stephan W. GALE 2023, 52(1): 70-77.  DOI: 10.3969/j.issn.1009-7791.2023.01.011 Abstract ( )   PDF (7599KB) ( )   Six native and two naturalised vascular plant species are newly added to the flora of Hong Kong SAR, China. The newly recorded native species are Aphanamixis polystachya (Wall.) R. Parker, Oplismenus undulatifolius (Ard.) Roemer & Schuit., Sageretia ellipsoidea Yi Yang, H. Sun & H. Peng, Sageretia hamosa (Wall.) Brongn., Trachelospermum brevistylum Hand.-Mazz. and Zingiber hainanense Y. S. Ye, L. Bai & N. H. Xia; and the two naturalised species are Alysicarpus ovalifolius (Schumach.) J. Léonard and Melothria pendula L. This is the first time the genera Aphanamixis Blume and Melothria L. have been recorded in the territory. Notes on distribution, habitat, phenology, taxonomy and key diagnostic features are provided. References | Related Articles | Metrics

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Research Progresses in the Quality Changes and the Storage Technologies of Postharvest Citrus Fruit WU Han-lu, ZENG Ling-zhen, LIN Yu-zhao, LIN He-tong 2023, 52(1): 78-84.  DOI: 10.3969/j.issn.1009-7791.2023.01.012 Abstract ( )   PDF (354KB) ( )   Citrus is an important tropical and subtropical fruit in southern China. Citrus fruit has higher nutritive value which can bring health benefits to humans. However, the harvested citrus fruit is prone to decay, dehydration, nutrients loss and disease occurrence, which lead to the quality deterioration, and thus reduce its commercial value. In order to provide the scientific basis and guide the production for improving the storability, maintaining the quality, and prolonging the storage life of citrus fruit during postharvest storage, the research progresses in the changes of fruit appearance color, fruit moisture, contents of pulp sugar, acid and vitamin C, the occurrences of fruit diseases including blue mold, brown spot, granulation and oleocellosis in the harvested citrus fruit, and the storage technologies such as low temperature storage, heat treatment, short-wave ultraviolet (UV-C) irradiation, chemical preservatives, and biological control for postharvest citrus fruit were reviewed in this paper. References | Related Articles | Metrics