Rapid regulation of photosynthetic light harvesting in the absence of minor antenna and reaction centre complexes.

Journal of Experimental Botany
Francesco SacconA V Ruban

Abstract

Plants are subject to dramatic fluctuations in the intensity of sunlight throughout the day. When the photosynthetic machinery is exposed to high light, photons are absorbed in excess, potentially leading to oxidative damage of its delicate membrane components. A photoprotective molecular process called non-photochemical quenching (NPQ) is the fastest response carried out in the thylakoid membranes to harmlessly dissipate excess light energy. Despite having been intensely studied, the site and mechanism of this essential regulatory process are still debated. Here, we show that the main NPQ component called energy-dependent quenching (qE) is present in plants with photosynthetic membranes largely enriched in the major trimeric light-harvesting complex (LHC) II, while being deprived of all minor LHCs and most photosystem core proteins. This fast and reversible quenching depends upon thylakoid lumen acidification (ΔpH). Enhancing ΔpH amplifies the extent of the quenching and restores qE in the membranes lacking PSII subunit S protein (PsbS), whereas the carotenoid zeaxanthin modulates the kinetics and amplitude of the quenching. These findings highlight the self-regulatory properties of the photosynthetic light-harvesting membrane...Continue Reading

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Citations

Jun 23, 2020·Journal of Experimental Botany·Matthew P Johnson
Dec 23, 2020·Plant & Cell Physiology·Alexander V Ruban, Sam Wilson
Aug 21, 2020·IScience·Francesco SacconTomáš Polívka
Jan 26, 2021·The Journal of Biological Chemistry·Fei LiBruno Robert
Jan 2, 2021·Journal of Photochemistry and Photobiology. B, Biology·Lorenzo FerroniSimonetta Pancaldi
Apr 28, 2021·Plant Science : an International Journal of Experimental Plant Biology·Ying ChenHisashi Ito
Jul 3, 2021·Biophysical Journal·Premashis MannaGabriela S Schlau-Cohen
Sep 30, 2021·The Journal of Physical Chemistry Letters·Anthi ChrysafoudiVangelis Daskalakis

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Methods Mentioned

BETA
fluorescence

Software Mentioned

NoM
FluoFit

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