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Redox regulation of PGRL1 at the onset of low light intensity
Author(s) -
Wolf BatChen,
Isaacson Tal,
Tiwari Vivekanand,
Dangoor Inbal,
Mufkadi Sapir,
Da Avihai
Publication year - 2020
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/tpj.14764
Subject(s) - photosynthesis , biophysics , oxidative phosphorylation , redox , photochemistry , chemistry , quenching (fluorescence) , electron transport chain , electron flow , photosystem ii , light intensity , photosystem i , biochemistry , biology , fluorescence , inorganic chemistry , physics , quantum mechanics , optics
SUMMARY PGR5‐LIKE PHOTOSYNTHETIC PHENOTYPE1 (PGRL1) regulates photosystem I cyclic electron flow which transiently activates non‐photochemical quenching at the onset of light. Here, we show that a disulfide‐based mechanism of PGRL1 regulated this process in vivo at the onset of low light levels. We found that PGRL1 regulation depended on active formation of key regulatory disulfides in the dark, and that PGR5 was required for this activity. The disulfide state of PGRL1 was modulated in plants by counteracting reductive and oxidative components and reached a balanced state that depended on the light level. We propose that the redox regulation of PGRL1 fine‐tunes a timely activation of photosynthesis at the onset of low light.