FIA functions as an early signal component of abscisic acid signal cascade in Vicia faba guard cells

Yusuke Sugiyama, Misugi Uraji, Megumi Watanabe-Sugimoto, Eiji Okuma, Shintaro Munemasa, Yasuaki Shimoishi, Yoshimasa Nakamura, Izumi Mori, Sumio Iwai, Yoshiyuki Murata

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An abscisic acid (ABA)-insensitive Vicia faba mutant, fia (fava bean impaired in ABA-induced stomatal closure) had previously been isolated. In this study, it was investigated how FIA functions in ABA signalling in guard cells of Vicia faba. Unlike ABA, methyl jasmonate (MeJA), H2O2, and nitric oxide (NO) induced stomatal closure in the fia mutant. ABA did not induce production of either reactive oxygen species or NO in the mutant. Moreover, ABA did not suppress inward-rectifying K + (Kin) currents or activate ABA-activated protein kinase (AAPK) in mutant guard cells. These results suggest that FIA functions as an early signal component upstream of AAPK activation in ABA signalling but does not function in MeJA signalling in guard cells of Vicia faba.

Original languageEnglish
Pages (from-to)1357-1365
Number of pages9
JournalJournal of Experimental Botany
Issue number3
Publication statusPublished - Feb 2012



  • Abscisic acid
  • fia
  • guard cell
  • methyl jasmonate
  • stomatal closure
  • Vicia faba

ASJC Scopus subject areas

  • Plant Science
  • Physiology

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