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Review article2021Peer reviewedOpen access

The physiological functionality of PGR5/PGRL1-dependent cyclic electron transport in sustaining photosynthesis

Liu, Yifei; Bai, Chunming; Yang, Yunhong; Sun, Zhiyu; Zhang, Siwei; Han, Xiaori; Yong, Jean W.H


The cyclic electron transport (CET), after the linear electron transport (LET), is another important electron transport pathway during the light reactions of photosynthesis. The proton gradient regulation 5 (PGR5)/PRG5-like photosynthetic phenotype 1 (PGRL1) and the NADH dehydrogenase-like complex pathways are linked to the CET. Recently, the regulation of CET around photosystem I (PSI) has been recognized as crucial for photosynthesis and plant growth. Here, we summarized the main biochemical processes of the PGR5/PGRL1-dependent CET pathway and its physiological significance in protecting the photosystem II and PSI, ATP/NADPH ratio maintenance, and regulating the transitions between LET and CET in order to optimize photosynthesis when encountering unfavorable conditions. A better understanding of the PGR5/PGRL1- mediated CET during photosynthesis might provide novel strategies for improving crop yield in a world facing more extreme weather events with multiple stresses affecting the plants.


photosynthesis; cyclic electron transport; proton gradient regulation 5; PRG5-like photosynthetic phenotype 1; photoinhibition

Published in

Frontiers in Plant Science
2021, Volume: 12, article number: 702196

    Sustainable Development Goals

    SDG13 Take urgent action to combat climate change and its impacts
    SDG2 End hunger, achieve food security and improved nutrition and promote sustainable agriculture

    UKÄ Subject classification

    Biochemistry and Molecular Biology

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