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JXB Advance Access published online on May 19, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erl002
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received February 2, 2006
Accepted March 28, 2006

Oxygen Metabolism ROS and Redox Signalling in Plants Special Issue

Tocopherol is the scavenger of singlet oxygen produced by the triplet states of chlorophyll in the PSII reaction centre

Anja Krieger-Liszkay 1 and Achim Trebst 2 *

1 Institut für Biologie II, Biochemie der Pflanzen, Universität Freiburg, Germany; Present address: Service de Bioénergétique, DBJC, CNRS URA 2096, CEA Saclay, F-91191 Gif-sur-Yvette, France
2 Biochemie der Pflanzen, Ruhr Universität Bochum, Germany

* To whom correspondence should be addressed.
Achim Trebst, E-mail: achim.trebst{at}rub.de


  Abstract

Recent developments on the role of tocopherol in the antioxidant network of the chloroplast and, in particular, in the protection of PSII in high light are summarized. The origin and conditions for singlet oxygen production in the reaction centre via P680 triplet formation are discussed, as well as the scavenging of this singlet oxygen by tocopherol. This is probably the obligatory function of tocopherol in the plant in high light acclimation. Furthermore, tocopherol is part of the modulation system of ROS in stress signalling.

Keywords: Photosystem II; ROS; singlet oxygen; tocopherol.
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