A1 Journal article – refereed

Action spectrum of the redox state of the plastoquinone pool defines its function in plant acclimation

List of Authors: Heta Mattila, Sergey Khorobrykh, Marja Hakala‐Yatkin, Vesa Havurinne, Iiris Kuusisto, Taras Antal, Taina Tyystjärvi, Esa Tyystjärvi

Publisher: WILEY

Publication year: 2020

Journal: Plant Journal

Journal name in source: PLANT JOURNAL

Journal acronym: PLANT J

Volume number: 104

Issue number: 4

Number of pages: 17

ISSN: 0960-7412

eISSN: 1365-313X

DOI: http://dx.doi.org/10.1111/tpj.14983

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 inArabidopsis 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.

Last updated on 2021-24-06 at 10:44