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JXB Advance Access published online on March 14, 2003
Journal of Experimental Botany, doi:10.1093/jxb/erg142
© 2003 by Oxford University Press
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Received November 11, 2002; accepted January 25, 2003
© 2003 Society for Experimental Biology

GENE NOTE

Characterization of an ethylene receptor homologue from wheat and its expression during leaf senescence

Qing-Hu Ma 1* Xing-Mei Wang 1

1 Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China

* To whom correspondence should be addressed. E-mail: mqh{at}ns.ibcas.ac.cn.


  Abstract

A wheat ethylene receptor homologue (W-er1) was isolated from a wheat stem cDNA library using the Arabidopsis ETR1 cDNA as a probe. The predicted amino acid sequence of W-er1 is over 70% similar to ERS1 from Arabidopsis and exhibits homology to bacterial two-component response regulators within the histidine kinase domain. Northern hybridization demonstrated that W-er1 was expressed in stem, leaf and root tissues. Treatments known to induce senescence of detached leaves including jasmonate, abscisic acid and wounding, increased the accumulation of W-er1 mRNA, while benzyladenine treatment did not. These data suggest that W-er1 may play a role in the process of leaf senescence.

Key words: Ethylene receptor homologue, leaf senescence, wheat.


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