AUTHOR=Ma Mingzhu , Liu Yifei , Bai Chunming , Yang Yunhong , Sun Zhiyu , Liu Xinyue , Zhang Siwei , Han Xiaori , Yong Jean Wan Hong 

TITLE=The Physiological Functionality of PGR5/PGRL1-Dependent Cyclic Electron Transport in Sustaining Photosynthesis

JOURNAL=Frontiers in Plant Science

VOLUME=Volume 12 - 2021

YEAR=2021

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2021.702196

DOI=10.3389/fpls.2021.702196

ISSN=1664-462X

ABSTRACT=The cyclic electron transport (CET), after the linear electron transport (LET), is another important electron transport pathway during the light reactions of photosynthesis. The PGR5(Proton Gradient Regulation 5)/PGRL1(PRG5-like photosynthetic phenotype 1) and the NADH dehydrogenase-like complex(NDH) pathways are linked to the CET. Recently, the regulation of cyclic electron transport around 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 (PSII) and photosystem I (PSI), ATP/NADPH ratio maintenance, and regulating the transitions between LET and CET in order to optimize photosynthesis when encountering unfavourable 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.