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JXB Advance Access published online on August 27, 2004
Journal of Experimental Botany, doi:10.1093/jxb/erh230
© 2004 by Oxford University Press
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Received May 10, 2004
Accepted June 17, 2004

Light Stress in Plants Special Issue

The central role of the green alga Chlamydomonas reinhardtii in revealing the mechanism of state transitions

Giovanni Finazzi 1*

1 UPR-CNRS 1261 (associée Université Paris 6), Institut de Biologie Physico Chimique, 13 rue Pierre et Marie Curie, F-75005 Paris, France

* To whom correspondence should be addressed. E-mail: giovanni.finazzi{at}ibpc.fr.


  Abstract

This review focuses on the essential role played by the green alga Chlamydomonas reinhardtii in revealing both the mechanism and the physiological consequences of state transitions. Two aspects are considered. The first is the role of the cytochrome b6f complex in regulating state transitions, in light of the recently obtained 3D structure. The second is the switch between linear and cyclic electron flow that follows state transitions in Chlamydomonas. Structural and dynamic elements that might be involved in such a switch, as well as its consequences on the energetic metabolism, are discussed.

Keywords: Chlamydomonas reinhardtii; energetic metabolism; linear and cyclic electron flow; state transitions.
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