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JXB Advance Access published online on April 29, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri180
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org
Received March 14, 2005
Accepted April 5, 2005

FOCUS PAPER

Photosynthetic redox control of nuclear gene expression

Vidal Fey 1, Raik Wagner 1, Katharina Bräutigam 1, and Thomas Pfannschmidt 1*

1 Institute of General Botany and Plant Physiology, Department of Plant Physiology, Friedrich-Schiller-University of Jena, Dornburger Str. 159, D-07743 Jena, Germany

* To whom correspondence should be addressed.
Thomas Pfannschmidt, E-mail: Thomas.Pfannschmidt{at}uni-jena.de


  Abstract

Chloroplasts contain 3000-4000 different proteins but only a small subset of them is encoded in the plastid genome while the majority is encoded in the nucleus. Expression of these genes therefore requires a high degree of co-ordination between nucleus and chloroplast. This is achieved by a bilateral information exchange between both compartments including nucleus-to-plastid (anterograde) and plastid-to-nucleus (retrograde) signals. The latter represent a functional feedback control which couples the expression of nuclear encoded plastid proteins to the actual functional state of the organelle. The efficiency of photosynthesis is a very important parameter in this context since it is influenced by many environmental conditions and therefore represents a sensor for the residing environment. Components of the photosynthetic electron transport chain exhibit significant changes in their reduction/oxidation (redox) state depending on the photosynthetic electron flow and therefore serve as signalling parameters which report environmental influences on photosynthesis. Such redox signals control chloroplast and nuclear gene expression events and play an important role in the co-ordination of both genetic compartments. It is discussed here which photosynthetic parameters are known to control nuclear gene expression, how these signals are transduced toward the nucleus, and how they interact with other plastid retrograde signals and cytosolic light perception systems.

Keywords: Crosstalk; nuclear gene expression; photoreceptor; photosynthesis; retrogade signalling; redox regulation; signal transduction networks.
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