Journal Article

In Diatoms, the Transthylakoid Proton Gradient Regulates the Photoprotective Non-photochemical Fluorescence Quenching Beyond its Control on the Xanthophyll Cycle

Johann Lavaud and Peter G. Kroth

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 7, pages 1010-1016
Published in print July 2006 | ISSN: 0032-0781
Published online July 2006 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcj058
In Diatoms, the Transthylakoid Proton Gradient Regulates the Photoprotective Non-photochemical Fluorescence Quenching Beyond its Control on the Xanthophyll Cycle

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In diatoms, the non-photochemical fluorescence quenching (NPQ) regulates photosynthesis during light fluctuations. NPQ is associated with an enzymatic xanthophyll cycle (XC) which is controlled by the light-driven transthylakoid proton gradient (ΔpH). In this report, special illumination conditions and chemicals were used to perturb the kinetics of the ΔpH build-up, of the XC and of NPQ. We found that the ΔpH-related acidification of the lumen is also needed for NPQ to develop by switching the xanthophylls to an ‘activated’ state, probably via the protonation of light-harvesting antenna proteins. It confirms the NPQ model previously proposed for diatoms.

Keywords: Diatom; Diatoxanthin; NPQ; Phaeodactylum tricornutum; Transthylakoid ΔpH; Xanthophyll cycle

Journal Article.  4158 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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