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JXB Advance Access originally published online on March 14, 2003
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Journal of Experimental Botany, Vol. 54, No. 386, pp. 1489-1490, May 1, 2003
© 2003 Oxford University Press

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

Received 11 November 2002; Accepted 25 January 2003

Qing-Hu Ma1, and Xing-Mei Wang

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

1 To whom correspondence should be addressed. Fax: +86 010 62590839. E-mail: mqh{at}ns.ibcas.ac.cn

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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