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The xanthophyll cycle pool size controls the kinetics of non‐photochemical quenching in Arabidopsis thaliana
Author(s) -
Johnson Matthew P.,
Davison Paul A.,
Ruban Alexander V.,
Horton Peter
Publication year - 2008
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2007.12.016
Subject(s) - xanthophyll , violaxanthin , zeaxanthin , antheraxanthin , non photochemical quenching , quenching (fluorescence) , kinetics , arabidopsis thaliana , chemistry , biophysics , lutein , photochemistry , botany , photosynthesis , biology , carotenoid , biochemistry , fluorescence , physics , mutant , optics , quantum mechanics , gene
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.
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