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Plant and Cell Physiology Advance Access published online on May 13, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj058
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Plant and Cell Physiology 2006 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received March 22, 2006
Accepted May 1, 2006

Short Communication

In Diatoms, the Transthylakoid Proton Gradient Regulates the Photoprotective Non-Photochemical Fluorescence Quenching beyond Its Control on the Xanthophyll Cycle

Johann Lavaud 1 * and Peter G. Kroth 1

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

* To whom correspondence should be addressed.
Johann Lavaud, E-mail: Johann.Lavaud{at}uni-konstanz.de


  Abstract

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 proposed for diatoms (Goss et al. 2006).

Keywords: diatom; diatoxanthin; Phaeodactylum tricornutum; NPQ; xanthophyll cycle; transthylakoid delta pH.
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