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Plant and Cell Physiology Advance Access originally published online on May 16, 2007
Plant and Cell Physiology 2007 48(6):833-842; 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 email: 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, PR China

*Corresponding author: E-mail, liyi{at}pku.edu.cn; Fax, +86-10-6275-4427.


  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. The presence of basal SA is required for the MeJA-induced WRKY62 expression, and both chemicals exhibit a synergistic effect on WRKY62 induction. In addition, upon treatment with an extremely low concentration of SA, cytosolic NPR1 controls the MeJA-induced expression of WRKY62. TGA transcription factors, which up-regulate SA-induced expression of WRKY62, are dispensable for the induction of WRKY62 in JA signaling. Genetic dissection of both wrky62 mutants and WRKY62-overexpressing plants indicated that WRKY62 down-regulates 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: Cytosolic - Jasmonate - NPR1 - Salicylate - WRKY62

Abbreviations: CaMV, cauliflower mosaic virus; DIG, digoxigenin; GFP, green fluorescent protein; INA, 2,6-dichloroisonicotinic acid; MeJA, methyl jasmonate; NahG, salicylate hydroxylase; NIMIN1, NIM1-INTERACTING1; NPR1, non-expresser of PR genes; PR, pathogenesis-related; SA, salicylic acid; JA, jasmonic acid; RNAi, RNA interference; SAR, systemic acquired resistance.

(Received March 22, 2007; Accepted May 6, 2007)
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