Map kinases, mpk9 and mpk12, regulate chitosan-induced stomatal closure

Mohammad Abdus Salam, Fabien Jammes, Mohammad Anowar Hossain, Wenxiu Ye, Yoshimasa Nakamura, Izumi C. Mori, June M. Kwak, Yoshiyuki Murata

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Chitosan (CHT)-induced stomatal closure was inhibited by an MAPKK inhibitor, PD98059, and was impaired in mpk9 mpk12 but not in mpk9 or mpk12. CHT induced the production of reactive oxygen species, cytosolic alkalization, and cytosolic Ca2+ oscillation in mpk9 mpk12. These results suggest that MPK9 and MPK12 are involved in CHT-induced stomatal closure.

Original languageEnglish
Pages (from-to)1785-1787
Number of pages3
JournalBioscience, Biotechnology and Biochemistry
Issue number9
Publication statusPublished - 2012


  • Chitosan
  • Cytosolic C
  • Cytosolic alkalization
  • Reactive oxygen species
  • Stomatal closure

ASJC Scopus subject areas

  • Biotechnology
  • Analytical Chemistry
  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Molecular Biology
  • Organic Chemistry


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