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Plant and Cell Physiology Advance Access published online on May 16, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm058
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

WRKY62 Transcription Factor Acts Downstream of Cytosolic NPR1 and Negatively Regulates Jasmonate-responsive Gene Expression

Peng Mao, Mingrui Duan, Chunhong Wei and Yi Li*

Peking-Yale Joint Center for Plant Molecular Genetics and Agrobiotechnology, National Laboratory of Protein Engineering and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing 100871, China

*Corresponding author: Yi Li. Tel: +86 10 6275 9690, FAX: +86 10 6275 4427, E-mail: liyi{at}pku.edu.cn


  Abstract

Cytosolic NPR1 has been shown to be essential for the salicylic acid (SA)-mediated suppression of jasmonic acid (JA)-responsive gene expression. However, factors downstream of NPR1 in the cross-talk between SA and JA signaling are unclear. Here we show that Arabidopsis WRKY62, a member of WRKY group III transcription factors, was induced by methyl jasmonate (MeJA) and SA treatment. Presence of basal SA is required for the MeJA-induced WRKY62 expression and both chemicals exhibit synergistic effect on the WRKY62 induction. In addition, upon treatment with extremely low concentration of SA, cytosolic NPR1 controls the MeJA-induced expression of WRKY62. TGA transcription factors, which upregulates SA-induced expression of WRKY62, are dispensable for the induction of WRKY62 in JA signaling. Genetic dissection of both wrky62 mutants and WRKY62 overexpression plants indicated that WRKY62 downregulates JA-responsive LOX2 and VSP2 expression. Our results demonstrate that WRKY62 acts downstream of cytosolic NPR1 and negatively regulates JA-responsive gene expression, suggesting that WRKY62 may be involved in the SA-mediated suppression of JA signaling.

Keywords: WRKY62 - salicylate - jasmonate - cytosolic - NPR1


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