Skip to Main content Skip to Navigation
Journal articles

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

Abstract : Photosynthesis produces organic carbon via a light-driven electron flow from H$_2$O to CO$_2$ 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 $pgr$6 mutant, the photoactive pool is depleted and becomes limiting under high light, affecting short-term acclimation and photosynthetic efficiency. In the long term, $pgr$6 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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [49 references]  Display  Hide  Download

https://hal-cea.archives-ouvertes.fr/cea-02178683
Contributor : Véronique Lamare <>
Submitted on : Wednesday, July 10, 2019 - 10:00:14 AM
Last modification on : Tuesday, September 22, 2020 - 2:46:02 PM

File

2019-Pralon-SAVE-s42003-019-04...
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

Thibaut Pralon, Venkatasalam Shanmugabalaji, Paolo Longoni, Gaétan Glauser, Brigitte Ksas, et al.. Plastoquinone homoeostasis by Arabidopsis proton gradient regulation 6 is essential for photosynthetic efficiency. Communications Biology, Nature Publishing Group, 2019, 2, pp.220. ⟨10.1038/s42003-019-0477-4⟩. ⟨cea-02178683⟩

Share

Metrics

Record views

423

Files downloads

812