Plastoquinone homoeostasis by Arabidopsis proton gradient regulation 6 is essential for photosynthetic efficiency.

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2019
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Abstract
Photosynthesis produces organic carbon via a light-driven electron flow from HO to CO that passes through a pool of plastoquinone molecules. These molecules are either present in the photosynthetic thylakoid membranes, participating in photochemistry (photoactive pool), or stored (non-photoactive pool) in thylakoid-attached lipid droplets, the plastoglobules. The photoactive pool acts also as a signal of photosynthetic activity allowing the adaptation to changes in light condition. Here we show that, in Arabidopsis thaliana, proton gradient regulation 6 (PGR6), a predicted atypical kinase located at plastoglobules, is required for plastoquinone homoeostasis, i.e. to maintain the photoactive plastoquinone pool. In a pgr6 mutant, the photoactive pool is depleted and becomes limiting under high light, affecting short-term acclimation and photosynthetic efficiency. In the long term, pgr6 seedlings fail to adapt to high light and develop a conditional variegated leaf phenotype. Therefore, PGR6 activity, by regulating plastoquinone homoeostasis, is required to cope with high light.
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Authors Pralon, Thibaut;Shanmugabalaji, Venkatasalam;Longoni, Paolo;Glauser, Gaetan;Ksas, Brigitte;Collombat, Joy;Desmeules, Saskia;Havaux, Michel;Finazzi, Giovanni;Kessler, Felix;
Journal Communications biology
Year 2019
DOI
10.1038/s42003-019-0477-4
URL
Keywords
photocatalyst l-cysteine polyethylene glycol mn-zns quantum dot organic dye zeolite nay

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