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JXB Advance Access originally published online on May 19, 2006
Journal of Experimental Botany 2006 57(8):1677-1684; 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

RESEARCH PAPER

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

Anja Krieger-Liszkay1 {dagger} and Achim Trebst2,*

1Institut für Biologie II, Biochemie der Pflanzen, Universität Freiburg, Germany
2Biochemie der Pflanzen, Ruhr Universität Bochum, Germany

*To whom correspondence should be sent. E-mail: achim.trebst{at}rub.de

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.

Key words: Photosystem II, ROS, singlet oxygen, tocopherol


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