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Pralon, Thibaut; Shanmugabalaji, Venkatasalam; Longoni, Paolo; Glauser, Gaetan; Ksas, Brigitte; Collombat, Joy; Desmeules, Saskia; Havaux, Michel; Finazzi, Giovanni; Kessler, Felix
Communications biology, 06/2019, Letnik: 2, Številka: 1Journal Article
Photosynthesis produces organic carbon via a light-driven electron flow from H O 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 , 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 mutant, the photoactive pool is depleted and becomes limiting under high light, affecting short-term acclimation and photosynthetic efficiency. In the long term, 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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