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Review article - Peer-reviewed, 2021

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

Authors' information

Ma, Mingzhu
Shenyang Agricultural University
Liu, Yifei
Shenyang Agricultural University
Bai, Chunming
Liaoning Academy of Agricultural Sciences
Yang, Yunhong
Yingkou Magnesite Chemical Ind Group Co
Sun, Zhiyu
Shenyang Agricultural University
Liu, Xinyue
Shenyang Agricultural University
Zhang, Siwei
Shenyang Agricultural University
Han, Xiaori
Shenyang Agricultural University
University of Western Australia
Swedish University of Agricultural Sciences, Department of Biosystems and Technology

Sustainable Development Goals

SDG13 Climate action
SDG2 Zero hunger

UKÄ Subject classification

Biochemistry and Molecular Biology

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