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JXB Advance Access originally published online on January 12, 2005
Journal of Experimental Botany 2005 56(411):407-416; doi:10.1093/jxb/eri106
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Journal of Experimental Botany, Vol. 56, No. 411, © Society for Experimental Biology 2005; all rights reserved

RESEARCH PAPER

Cyclic electron transport in C3 plants: fact or artefact?

Giles N. Johnson*

School of Biological Sciences, University of Manchester, 3.614 Stopford Building, Oxford Road, Manchester M13 9PT, UK

* Fax: +44 (0)161 275 3938. E-mail: giles.johnson{at}man.ac.uk

The phenomenon of cyclic electron transport was first characterized in higher plant chloroplasts 50 years ago, yet there is still a debate about whether or not this is a physiological process. The recent isolation of mutants that appear to lack cyclic electron transport, as well as new data providing functional evidence for its occurrence, support the notion that this pathway plays an important role in plant responses to stress, providing a pH gradient across the thylakoid membrane to trigger non-photochemical quenching of chlorophyll fluorescence. At present, little is known about the regulation of cyclic electron transport, but it is possible that this is activated in response to a low redox potential in the chloroplast stroma.

Key words: Cyclic electron transport, cytochrome b6f, NPQ pgr5, photosystem I, photosystem II, {Delta}pH


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