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Action spectrum of the redox state of the plastoquinone pool defines its function in plant acclimation
Author(s) -
Mattila Heta,
Khorobrykh Sergey,
HakalaYatkin Marja,
Havurinne Vesa,
Kuusisto Iiris,
Antal Taras,
Tyystjärvi Taina,
Tyystjärvi Esa
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.14983
Subject(s) - plastoquinone , photosystem ii , redox , light intensity , action spectrum , photosynthesis , dcmu , photochemistry , chemistry , photosystem , photosystem i , botany , biophysics , biology , chloroplast , physics , thylakoid , biochemistry , optics , inorganic chemistry , gene
SUMMARY The plastoquinone (PQ) pool mediates electron flow and regulates photoacclimation in plants. Here we report the action spectrum of the redox state of the PQ pool in Arabidopsis thaliana , showing that 470–500, 560 or 650–660 nm light favors Photosystem II (PSII) and reduces the PQ pool, whereas 420–440, 520 or 690 nm light favors Photosystem I (PSI) and oxidizes PQ. These data were used to construct a model predicting the redox state of PQ from the spectrum of any polychromatic light source. Moderate reduction of the PQ pool induced transition to light state 2, whereas state 1 required highly oxidized PQ. In low‐intensity PSI light, PQ was more oxidized than in darkness and became gradually reduced with light intensity, while weak PSII light strongly reduced PQ. Natural sunlight was found to favor PSI, which enables plants to use the redox state of the PQ pool as a measure of light intensity.