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JXB Advance Access originally published online on March 13, 2009
Journal of Experimental Botany 2009 60(6):1589-1604; doi:10.1093/jxb/erp039
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© 2009 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

HHP1 is involved in osmotic stress sensitivity in Arabidopsis

Chin-chung Chen2, Ching-shin Liang2, Ai-ling Kao2 and Chien-chih Yang1,2,*

1Department of Biochemical Science and Technology, National Taiwan University, 1 Sec. 4, Roosevelt Road, Taipei, Taiwan
2Institute of Microbiology and Biochemistry, National Taiwan University, 1 Sec. 4, Roosevelt Road, Taipei, Taiwan

* To whom correspondence should be addressed: E-mail: ccyang{at}ntu.edu.tw

HHP1 (heptahelical protein 1), a protein with a predicted seven transmembrane domain structure homologous to adiponectin receptors (AdipoRs) and membrane progestin receptors (mPRs), has been characterized. Expression of HHP1 was increased in response to abscisic acid (ABA) and salt/osmotic stress as shown by quantitative real-time PCR and HHP1 promoter-controlled GUS activity. The HHP1 T-DNA insertion mutant (hhp1-1) showed a higher sensitivity to ABA and osmotic stress than the wild-type (WT), as revealed by the germination rate and post-germination growth rate. The induced expression of stress-responsive genes (RD29A, RD29B, ADH1, KIN1, COR15A, and COR47) was more sensitive to exogenous ABA and osmotic stress in hhp1-1 than in the WT. The hypersensitivity in the hhp1-1 mutant was reversed in the complementation mutant of HHP1 expressing the HHP1 gene. The data suggest that the mutation of HHP1 renders plants hypersensitive to ABA and osmotic stress and HHP1 might be a negative regulator in ABA and osmotic signalling.

Key words: ABA, HHP1, mPR, osmotic stress

Received 10 December 2008; Revised 21 January 2009 Accepted 22 January 2009


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