Roles of RCN1, regulatory a subunit of protein phosphatase 2a, in methyl jasmonate signaling and signal crosstalk between methyl jasmonate and abscisic acid

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Methyl jasmonate (MeJA) as well as abscisic acid (ABA) induces stomatal closure with their signal crosstalk. We investigated the function of a regulatory A subunit of protein phosphatase 2A, RCN1, in MeJA signaling. Both MeJA and ABA failed to induce stomatal closure in Arabidopsis rcn1 knockout mutants unlike in wild-type plants. Neither MeJA nor ABA induced reactive oxygen species (ROS) production and suppressed inward-rectifying potassium channel activities in rcn1 mutants but not in wild-type plants. These results suggest that RCN1 functions upstream of ROS production and downstream of the branch point of MeJA signaling and ABA signaling in Arabidopsis guard cells.

Original languageEnglish
Pages (from-to)1396-1401
Number of pages6
JournalPlant and Cell Physiology
Issue number9
Publication statusPublished - Sep 2008



  • Abscisic acid
  • Arabidopsis thaliana
  • Guard cells
  • K channel
  • Methyl jasmonate
  • Reactive oxygen species

ASJC Scopus subject areas

  • Plant Science
  • Physiology
  • Cell Biology

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