Journal Article

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

Jinxin Zhou, Hongbo Zhang, Yuhong Yang, Zhijin Zhang, Haiwen Zhang, Xinwen Hu, Jia Chen, Xue-Chen Wang and Rongfeng Huang

in Journal of Experimental Botany

Published on behalf of Society for Experimental Biology

Volume 59, issue 3, pages 645-652
Published in print February 2008 | ISSN: 0022-0957
Published online February 2008 | e-ISSN: 1460-2431 | DOI:

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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.

Keywords: Abscisic acid; ERF protein TSRF1; GCC box-containing genes; Ralstonia solanacearum; tobacco

Journal Article.  4520 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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