数字农科院2.0

Cyclic Electron Flow Modulate The Linear Electron Flow And Reactive Oxygen Species In Tomato Leaves Under High Temperature

文献类型： 外文期刊

作者： Lu, JZ; Yin, ZP; Lu, T; Yang, XL; Wang, F; Qi, MF; Li, TL; Liu, YF

作者机构：

关键词： High Temperature; Photoinhibition; Cyclic Electron Bow; Pgr5; Ndh

期刊名称： PLANT SCIENCE

ISSN： 0168-9452

年卷期： 2020 年 292 卷

页码：

收录情况： JCR（2021版）

摘要： The cyclic electron flow (CEF) around photosystem I (PSI) plays a crucial role in photosynthesis and also functions in plant tolerance of abiotic environmental stress. However, the role of PGR5/PGRL1- and NDH-dependent CEF in tomato under hightemperature (HT) is poorly understood. Here, we assessed the photo-protective effect of these pathways in tomato leaves under HT by using antimycin A (AA) and rotenone (R), which are chemical inhibitors of PGR5/PGRL1- and NDH-dependent CEF, respectively. The results showed that AA treatment caused significantly greater inhibition of CEF under HT compared to R treatment. Moreover, AA treatment caused a greater decrease in maximal photochemistry efficiency (F-v/F-m) and increased damage to the donor and acceptor side of photosystem II (PSII); however, the limitation of the acceptor side in PSI [Y(NA)] was significantly increased. In addition, thylakoid membrane integrity was compromised and reactive oxygen species, proton gradient (Delta pH), antioxidant enzyme activity, and the expression of photosystem core subunit genes were significantly decreased under AA treatment. These findings indicate that PGR5/PGRL1-dependent CEF protects PSII and PSI from photooxidative damage through the formation of ApH while maintaining thylakoid membrane integrity and normal gene expression levels of core photosystem components. This study demonstrates that PGR5/PGRL1-dependent CEF plays a major role in HT response in tomato.

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