The xanthophyll cycle pool size controls the kinetics of non‐photochemical quenching in Arabidopsis thaliana

FEBS Letters - Tập 582 - Trang 262-266 - 2008
Matthew P. Johnson1, Paul A. Davison1, Alexander V. Ruban2, Peter Horton1
1Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, United Kingdom
2School of Biological and Chemical Sciences, Queen Mary University of London, Mile End, Bancroft Road, London E1 4NS, United Kingdom

Tóm tắt

Arabidopsis plants overexpressing β‐carotene hydroxylase 1 accumulate over double the amount of zeaxanthin present in wild‐type plants. The final amplitude of non‐photochemical quenching (NPQ) was found to be the same in these plants, but the kinetics were different. The formation and relaxation of NPQ consistently correlated with the de‐epoxidation state of the xanthophyll cycle pool and not the amount of zeaxanthin. These data indicate that zeaxanthin and violaxanthin antagonistically regulate the switch between the light harvesting and photoprotective modes of the light harvesting system and show that control of the xanthophyll cycle pool size is necessary to optimize the kinetics of NPQ.

Tài liệu tham khảo

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FEBS Letters

Tập 582

262-266

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