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Brassinosteroids protect photosynthesis and antioxidant system of eggplant seedlings from high-temperature stress

文献类型: 外文期刊

作者: Wu, Xuexia 1 ; Yao, Xinfeng 2 ; Chen, Jianlin 2 ; Zhu, Zongwen 1 ; Zhang, Hui 1 ; Zha, Dingshi 3 ;

作者机构: 1.Shanghai Acad Agr Sci, Inst Hort Res, Shanghai Key Lab Protected Hort Technol, Shanghai 201403, Peoples R China

2.Shanghai Acad Agr Sci, Agr Informat Inst Sci & Technol, Shanghai Engn Res Ctr Digital Agr, Shanghai 201403, Peoples R China

3.Shanghai Acad Agr Sci, Inst Hort Res, Shanghai Key Lab Protected Hort Technol, Shanghai 201106, Peoples R China

关键词: EBR;High temperature;Photosynthesis;Chlorophyll fluorescence;Antioxidant system;Eggplant

期刊名称:ACTA PHYSIOLOGIAE PLANTARUM ( 影响因子:2.354; 五年影响因子:2.711 )

ISSN:

年卷期:

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收录情况: SCI

摘要: The effects of 24-epibrassinolide under high temperature in eggplant (Solanum melongena L.) seedlings were studied by investigating the plant growth, chlorophyll content, photosynthesis and antioxidant systems. High temperature significantly inhibitedthe plant growth and markedly decreased the chlorophyll content, net photosynthetic rate, stomatal conductance and transpiration rate, while it increased intercellular CO2 concentration. In a similar manner, high temperature also decreased significantlymaximum quantum efficiency of PSII, potential photochemical efficiency, the quantum efficiency of PSII, photochemical quenching, the excitation capture efficiency of open centers, and increased non-photochemical quenching. Application of 0.05–0.2 μM EBR remarkably promoted the plant growth and alleviated high-temperature-induced inhibition of photosynthesis. Under high temperature, reactive oxygen species levels and lipid peroxidation were markedly increased, which were remarkably inhibited by application of 0.05–0.2 μM EBR. The activities of antioxidative enzymes such as superoxide dismutase, peroxidase, catalase and ascorbate peroxidase, and contents of ascorbic acid and reduced glutathione were significantly increased during high-temperature treatments, and these increases were more pronounced than those of EBR at 0.05–0.2 μM treatment. The EBR treatment also greatly enhanced contents of proline, soluble sugar and protein under high-temperature stress. Taken together, it can be concluded that 0.05–0.2 μM EBR could alleviate the detrimental effects of high temperatures on plant growth by increasing photosynthetic efficiency and enhancing antioxidant enzyme systems. Addition of 0.1 μM EBR had the best ameliorative effect against high temperature, while the addition of 0.4 μM EBR had no significant effects.

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