Salicylic acid receptor NPR1 is involved in guard cell chitosan signaling

Yeasin Prodhan, Mohammad Issak, Shintaro Munemasa, Yoshimasa Nakamura, Yoshiyuki Murata

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Chitosan (CHT) induces stomatal closure and thus plays a crucial role in plants to adapt to the adverse environments. Our previous results of a SA-deficient mutant nahG suggest that endogenous salicylic acid (SA) is involved in the CHT signaling in guard cells. Here in order to make the involvement definite, we examined stomatal responses to CHT of another SA-deficient mutant, sid2, and an SA receptor mutant, npr1-3. The sid2 mutation impaired CHT-induced stomatal closure and reactive oxygen species production and both impairments were complemented with exogenous SA application. Moreover, the CHT-induced stomatal closure is disrupted in the npr1-3 mutant. These results suggest that endogenous SA is involved in the CHT-induced stomatal closure via the SA receptor, NPR1. Abbreviations: SA: salicylic acid; ABA: abscisic acid; ROS: reactive oxygen species; NPR1: nonexpresser of pathogenesis-related genes1; CHT: chitosan; DAB: 3,3′-diaminobenzidine.

Original languageEnglish
Pages (from-to)963-969
Number of pages7
JournalBioscience, Biotechnology and Biochemistry
Issue number5
Publication statusPublished - May 3 2020


  • Stomatal closure
  • chitosan
  • reactive oxygen species
  • salicylic acid
  • salicylic acid receptor

ASJC Scopus subject areas

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


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