Journal Article

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

Peng Mao, Mingrui Duan, Chunhong Wei and Yi Li

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 48, issue 6, pages 833-842
Published in print June 2007 | ISSN: 0032-0781
Published online June 2007 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcm058
WRKY62 Transcription Factor Acts Downstream of Cytosolic NPR1 and Negatively Regulates Jasmonate-Responsive Gene Expression

More Like This

Show all results sharing these subjects:

  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

GO

Show Summary Details

Preview

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

Journal Article.  5916 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.