Catalases negatively regulate methyl jasmonate signaling in guard cells

Rayhanur Jannat, Misugi Uraji, Mohammad Anowar Hossain, Mohammad Muzahidul Islam, Yoshimasa Nakamura, Izumi C. Mori, Yoshiyuki Murata

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Methyl jasmonate (MeJA)-induced stomatal closure is accompanied by the accumulation of hydrogen peroxide (H 2O 2) in guard cells. In this study, we investigated the roles of catalases (CATs) in MeJA-induced stomatal closure using cat mutants cat2, cat3-1 and cat1 cat3, and the CAT inhibitor, 3-aminotriazole (AT). When assessed with 2',7'-dichlorodihydrofluorescein, the reduction of catalase activity by means of mutations and the inhibitor accumulated higher basal levels of H 2O 2 in guard cells whereas they did not affect stomatal aperture in the absence of MeJA. In contrast, the cat mutations and the treatment with AT potentiated MeJA-induced stomatal closure and MeJA-induced H 2O 2 production. These results indicate that CATs negatively regulate H 2O 2 accumulation in guard cells and suggest that inducible H 2O 2 production rather than constitutive elevation modulates stomatal apertures in Arabidopsis.

Original languageEnglish
Pages (from-to)1012-1016
Number of pages5
JournalJournal of Plant Physiology
Issue number10
Publication statusPublished - Jul 1 2012


  • Catalase
  • Guard cells
  • Hydrogen peroxide
  • Methyl jasmonate

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science


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