Physiological function of PGR5-dependent PSI cyclic electron transport in rice

Abstract

PSI cyclic electron transport generates ΔpH and consequently ATP without accumulation of NADPH and is required for both photoprotection and efficient photosynthesis. In higher plants, the main pathway is mediated by Antimycin A-sensitive, PGR5-dependent electron transport. In this study, we knock-downed the PGR5 gene in rice to study its function in the monocotyledonous crop. Both ETR and NPQ were severely impaired in the lines, suggesting that the function of PGR5 is conserved between Arabidopsis and rice.