文献类型： 外文期刊

作者： Xu Chao ¹ ; Tang Yuqing ¹ ; Liu Xincheng ¹ ; Yang Huidong ¹ ; Wang Yuting ¹ ; Hu Zhongdong ¹ ; Hu Xinlong ¹ ; Liu Buchun ² ; Su Jing ³ ;

作者机构： 1.Jiangxi Acad Agr Sci, Inst Hort, Key Lab Hort Plant Genet & Physiol, Nanchang, Jiangxi, Peoples R China

2.Natl Engn Lab Efficient Crop Water Use & Disaster, Key Lab Agr Environm, CAAS, Inst Environm & Sustainable Dev Agr,Minist Agr &, Beijing, Peoples R China

3.Nanjing Inst Environm Sci, MEE, Nanjing, Peoples R China

关键词： Antioxidants; chlorophyll fluorescence; gas exchange; heat stress; photosynthesis

期刊名称：PLANT SIGNALING & BEHAVIOR （ 影响因子：2.734； 五年影响因子：2.746 ）

ISSN： 1559-2316

年卷期： 2022 年 17 卷 1 期

页码：

收录情况： SCI

摘要： Studies have not fully explained the underlying mechanism of spermidine-mediated heat tolerance. This study investigated the possible role of spermidine (Spd) in regulating citrus heat tolerance. The results showed that exogenous Spd effectively alleviated the limitation of high temperature (HT) on photosynthesis. Exogenous Spd increased the chlorophyll content, net photosynthetic rate, intercellular carbon dioxide concentration, stomatal conductance, maximum and effective quantum yield of PSII photochemistry, nonphotochemical quenching coefficient, and electron transport rate in citrus seedlings under HT stress, but declined the stomatal limitation value. In addition, Spd treatment promoted the dynamic balance of the citrus enzymatic and non-enzymatic antioxidants system. Spd application significantly increased the activity of superoxide dismutase, peroxidase, catalase, ascorbic acid, and glutathione and the expression level of corresponding genes at high temperature, while reducing the content of H2O2 and malondialdehyde. Therefore, our findings suggested exogenous Spd significantly ameliorated citrus physiological and photosynthetic adaptation under HT stress, thereby providing helpful guidance for citrus cultivation in HT events.