摘要
环式电子传递(CEF)是光合作用光反应中仅次于线性电子传递(LEF)的另一条重要的电子传递途径。CEF包括NAD(P)H脱氢酶复合体(NDH)和PGR5 (Proton Gradient Regulation 5)/PGRL1 (Proton Gradient Regulation Like 1)两条途径,其中PGR5/PGRL1被认为是高等植物CEF中的主要途径。本文综述了PGR5/PGRL1介导的CEF的主要作用机理,以及在逆境胁迫下该途径通过保护光系统Ⅱ和光系统Ⅰ、维持ATP/NADPH比例、调节LEF和CEF的转换来缓解光抑制中的生理作用,以期为今后的相关研究提供参考。
Cyclic electron flow(CEF) is an important electron transport pathway in light reaction of photosynthesis followed by linear electron flow(LEF). CEF includes NAD(P)H dehydrogenase complex(NDH) and PGR5(Proton Gradient Regulation 5)/PGRL1(Proton Gradient Regulation Like 1) pathways. Among them,PGR5/PGRL1-dependent CEF is considered to be the key pathway in plants. This review summarizes the mechanism of PGR5/PGRL1-dependent CEF and the physiological mechanism of PGR5/PGRL1-dependent CEF under stresses by protecting photosystem Ⅱ(PSⅡ) and PSI, maintaining ATP/NADPH ratio, and adjusting the conversion of LEF and CEF to alleviate the physiological role of photoinhibition. This review would provide a theoretical basis for future researches in the field of the mechanism of PGR5/PGRL1-dependent CEF.
引文
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