Fluctuating light induces a significant photoinhibition of photosystem I in maize

文献类型： 外文期刊

第一作者： Yang, Qiu-Yan

作者： Yang, Qiu-Yan;Wang, Xiao-Qian;Yang, Qiu-Yan;Huang, Wei;Yang, Ying-Jie

作者机构：

关键词： C 4 plants; Cyclic electron flow; Fluctuating light; Photosystem I; Photorespiration

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：6.5； 五年影响因子：6.4 ）

ISSN： 0981-9428

年卷期： 2024 年 207 卷

页码：

收录情况： SCI

摘要： In nature, light intensity usually fluctuates and a sudden shade -sun transition can induce photodamage to photosystem I (PSI) in many angiosperms. Photosynthetic regulation in fluctuating light (FL) has been studied extensively in C3 plants; however, little is known about how C4 plants cope FL to prevent PSI photoinhibition. We here compared photosynthetic responses to FL between maize (Zea mays, C4) and tomato (Solanum lycopersicum, C3) grown under full sunlight. Maize leaves had significantly higher cyclic electron flow (CEF) activity and lower photorespiration activity than tomato. Upon a sudden shade -sun transition, maize showed a significant stronger transient PSI over -reduction than tomato, resulting in a significant greater PSI photoinhibition in maize after FL treatment. During the first seconds upon shade -sun transition, CEF was stimulated in maize at a much higher extent than tomato, favoring the rapid formation of trans-thylakoid proton gradient (ApH), which was helped by a transient down -regulation of chloroplast ATP synthase activity. Therefore, modulation of ApH by regulation of CEF and chloroplast ATP synthase adjusted PSI redox state at donor side, which partially compensated for the deficiency of photorespiration. We propose that C4 plants use different photosynthetic strategies for coping with FL as compared with C3 plants.

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