Skip to Main content Skip to Navigation
Journal articles

Plant tolerance to excess light energy and photooxidative damage relies on plastoquinone biosynthesis

Abstract : Plastoquinone-9 is known as a photosynthetic electron carrier to which has also been attributed a role in the regulation of gene expression and enzyme activities via its redox state. Here, we show that it acts also as an antioxidant in plant leaves, playing a central photoprotective role. When Arabidopsis plants were suddenly exposed to excess light energy, a rapid consumption of plastoquinone-9 occurred, followed by a progressive increase in concentration during the acclimation phase. By overexpressing the plastoquinone-9 biosynthesis gene SPS1 (SOLANESYL DIPHOSPHATE SYNTHASE 1) in Arabidopsis, we succeeded in generating plants that specifically accumulate plastoquinone-9 and its derivative plastochromanol-8. The SPS1-overexpressing lines were much more resistant to photooxidative stress than the wild type, showing marked decreases in leaf bleaching, lipid peroxidation and PSII photoinhibition under excess light. Comparison of the SPS1 overexpressors with other prenyl quinone mutants indicated that the enhanced phototolerance of the former plants is directly related to their increased capacities for plastoquinone-9 biosynthesis.
Document type :
Journal articles
Complete list of metadata

https://hal-amu.archives-ouvertes.fr/hal-03246179
Contributor : Julien Caugant <>
Submitted on : Wednesday, June 2, 2021 - 11:30:34 AM
Last modification on : Thursday, June 3, 2021 - 3:36:28 AM

File

srep10919.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

Brigitte Ksas, Noëlle Becuwe, Anne Chevalier, Michel Havaux. Plant tolerance to excess light energy and photooxidative damage relies on plastoquinone biosynthesis. Scientific Reports, Nature Publishing Group, 2015, 5, ⟨10.1038/srep10919⟩. ⟨hal-03246179⟩

Share

Metrics

Record views

25

Files downloads

10