Protection of photosystem I during sudden light stress depends on ferredoxin:NADP(H) reductase abundance and interactions.

ABSTRACT: Plant tolerance to high light and oxidative stress is increased by overexpression of the photosynthetic enzyme Ferredoxin:NADP(H) reductase (FNR), but the specific mechanism of FNR-mediated protection remains enigmatic. It has also been reported that the localization of this enzyme within the chloroplast is related to its role in stress tolerance. Here, we dissected the impact of FNR content and location on photoinactivation of photosystem I (PSI) and photosystem II (PSII) during high light stress of Arabidopsis (Arabidopsis thaliana). The reaction center of PSII is efficiently turned over during light stress, while damage to PSI takes much longer to repair. Our results indicate a PSI sepcific effect, where efficient oxidation of the PSI primary donor (P700) upon transition from darkness t

SUBMITTER: Rodriguez-Heredia M 

PROVIDER: S-EPMC8825262 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature