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mediates plant responses to abscisic acid and drought tolerance in Arabidopsis.pdf

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mediates plant responses to abscisic acid and drought tolerance in Arabidopsis

ABO3, a WRKY transcription factor, mediates plant responses to abscisic acid and drought tolerance in Arabidopsis Xiaozhi Ren1, Zhizhong Chen1, Yue Liu1, Hairong Zhang1, Min Zhang1, Qian Liu1, Xuhui Hong1, Jian-Kang Zhu2,3 and Zhizhong Gong1,3,4,* 1State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China, 2Department of Botany and Plant Sciences, Institute for Integrative Genome Biology, 2150 Batchelor Hall, University of California, Riverside, CA 92521, USA, 3China Agricultural University, University of California-Riverside Center for Biological Sciences and Biotechnology, Beijing 100193, China, and 4National Center for Plant Gene Research, Beijing 100193, China Received 11 March 2010; revised 20 April 2010; accepted 28 April 2010; published online 7 June 2010. *For correspondence (fax 86 10 e-mail gongzz@). SUMMARY The biological functions of WRKY transcription factors in plants have been widely studied, but their roles in abiotic stress are still not well understood. We isolated an ABA overly sensitive mutant, abo3, which is disrupted by a T-DNA insertion in At1g66600 encoding a WRKY transcription factor AtWRKY63. The mutant was hypersensitive to ABA in both seedling establishment and seedling growth. However, stomatal closure was less sensitive to ABA, and the abo3 mutant was less drought tolerant than the wild type. Northern blot analysis indicated that the expression of the ABA-responsive transcription factor ABF2/AREB1 was markedly lower in the abo3 mutant than in the wild type. The abo3 mutation also reduced the expression of stress- inducible genes RD29A and COR47, especially early during ABA treatment. ABO3 is able to bind the W-box in the promoter of ABF2 in vitro. These results uncover an important role for a WRKY transcription factor in plant responses to ABA and drought stress. Keywords: WRKY transcription factor, abscisic acid, Arabidopsis, drought stress.