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Plant and Cell Physiology Advance Access originally published online on May 13, 2006
Plant and Cell Physiology 2006 47(7):1010-1016; doi:10.1093/pcp/pcj058
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© The Author 2006. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

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

Group of Plant Ecophysiology, Biology Department, University of Konstanz, Germany

* Corresponding author: E-mail, Johann.Lavaud{at}uni-konstanz.de; Fax, +49-7531-88-3042.

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 ({Delta}pH). In this report, special illumination conditions and chemicals were used to perturb the kinetics of the {Delta}pH build-up, of the XC and of NPQ. We found that the {Delta}pH-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.

(Received March 22, 2006; Accepted May 1, 2006)
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