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JXB Advance Access published online on February 4, 2008
Journal of Experimental Botany, doi:10.1093/jxb/erm353
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© 2008 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

Abscisic acid regulates TSRF1-mediated resistance to Ralstonia solanacearum by modifying the expression of GCC box-containing genes in tobacco

Jinxin Zhou1,2 * {dagger}, Hongbo Zhang1,4 *, Yuhong Yang3, Zhijin Zhang1, Haiwen Zhang1, Xinwen Hu2, Jia Chen4, Xue-Chen Wang4 and Rongfeng Huang1,{ddagger}

1Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
2College of Agriculture, South China University of Tropical Agriculture, Danzhou 571737, Hainan, China
3Vegetable and Flower Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
4National Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100094, China

{ddagger} To whom correspondence should be addressed. E-mail: rongfeng{at}public3.bta.net.cn

Although recent studies have established a significant regulatory role for abscisic acid (ABA) and ethylene response factor (ERF) proteins in plant pathogen resistance, it is not clear whether and how ABA performs this role. Previously, it was reported that an ERF protein, TSRF1, activates the expression of GCC box-containing genes and significantly enhances the resistance to Ralstonia solanacearum in both tobacco and tomato plants. Here, it is reported that TSRF1-regulated pathogen resistance is modified by ABA application. TSRF1 activates the expression of ABA biosynthesis-related genes, resulting in the increase of ABA biosynthesis, which further stimulates ethylene production. More interestingly, ABA application decreases, while the inhibitor of ABA biosynthesis fluridone increases, the TSRF1-enhanced resistance to R. solanacearum. This observation is further supported by the finding that ABA and fluridone reversibly modify the ability of TSRF1 to bind the ethylene-responsive GCC box, consequently altering the expression of element-controlled genes. These results therefore establish that TSRF1-regulated resistance to R. solanacearum can be modified in tobacco by ABA.

Key words: Abscisic acid, ERF protein TSRF1, GCC box-containing genes, Ralstonia solanacearum, tobacco

* These authors contributed equally to this work.

{dagger} Present address: Botanic Garden of Wuhan, Chinese Academy of Sciences, Wuhan 430074, China.

Received 31 October 2007; Revised 13 December 2007 Accepted 14 December 2007


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