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JXB Advance Access originally published online on September 9, 2003
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Journal of Experimental Botany, Vol. 54, No. 392, pp. 2593-2595, November 1, 2003
© 2003 Oxford University Press

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

Received 19 May 2003; Accepted 22 July 2003

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

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

* To whom correspondence should be addressed. Fax: +27 21 689 7573. E-mail: collett{at}science.uct.ac.za

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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