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JXB Advance Access published online on September 9, 2003
Journal of Experimental Botany, doi:10.1093/jxb/erg285
© 2003 by Oxford University Press
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Received May 19, 2003; accepted July 22, 2003
© 2003 Society for Experimental Biology

GENE NOTE

Photosynthetic genes are differentially transcribed during the dehydration-rehydration cycle in the resurrection plant, Xerophyta humilis

Helen Collett 1*, Rafal Butowt 1, James Smith 1, Jill Farrant 1, and Nicola Illing 1

1 Department of Molecular and Cell Biology, University of Cape Town, Rondebosch 7701, South Africa

* To whom correspondence should be addressed. E-mail: collett{at}science.uct.ac.za.


  Abstract

One of the desiccation-tolerant mechanisms of the resurrection plant, Xerophyta humilis, is the ability to shut down photosynthesis reversibly. The X. humilis psbR and ChlP genes, encoding the 10 kDa polypeptide of photosystem II (PSII) and a geranylgeranyl reducatase, respectively, were isolated in a differential display screen as dehydration-down-regulated and rehydration-up-regulated transcripts. Two other PSII genes, psbA (chloroplast-encoded) and psbP (nuclear-encoded), isolated by degenerate primer PCR, display a similar trend in expression.

Key words: Dehydration-rehydration cycle, photosynthesis, photosystem II genes, resurrection plant, transcript.


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