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JXB Advance Access published online on September 27, 2007
Journal of Experimental Botany, doi:10.1093/jxb/erm145
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© The Author [2007]. 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

FOCUS PAPER

Light-regulated nucleo-cytoplasmic partitioning of phytochromes

Eva Kevei1,2,*, Eberhard Schafer1 and Ferenc Nagy2

1Biologie II/Institute fur Botanik, University of Freiburg, D-79104 Freiburg, Germany
2Institute of Plant Biology, Biological Research Center, H-6726 Szeged, Hungary

* To whom correspondence should be addressed. E-mail: kevei{at}brc.hu

Phytochrome photoreceptors regulate development, growth, and fitness throughout the entire life-cycle of plants, from seed germination to flowering, by regulating expression patterns of ~10–30% of the entire plant transcriptome. Identification of components and elucidation of the molecular mechanisms underlying phytochrome-controlled signal transduction cascades have therefore attracted considerable attention. Phytochrome-controlled signalling is a complex cellular process; it starts with the light-induced intramolecular conformational change of the photoreceptor and includes regulated partitioning and degradation of signalling components and of the photoreceptors themselves. In this review, the data available about light quality- and quantity-dependent nucleo-cytoplasmic partitioning of phytochromes is summarized and the possible function of phytochrome-containing nuclear complexes, termed nuclear bodies, in red/far-red light-induced signalling is discussed.

Key words: Light signalling, nuclear import, phytochromes

Received 12 April 2007; Revised 25 May 2007 Accepted 30 May 2007


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