title: FIA functions as an early signal component of abscisic acid signal cascade in Vicia faba guard cells.
abstract: 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), H(2)O(2), 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(+) (K(in)) 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.
authors: Graduate School of Natural Science and Technology, Division of Bioscience, Faculty of Agriculture, Okayama University, Okayama, 700-8530, Japan.
authors: Yusuke
authors: Y
authors: Sugiyama
authors: Misugi
authors: M
authors: Uraji
authors: Megumi
authors: M
authors: Watanabe-Sugimoto
authors: Eiji
authors: E
authors: Okuma
authors: Shintaro
authors: S
authors: Munemasa
authors: Yasuaki
authors: Y
authors: Shimoishi
authors: Yoshimasa
authors: Y
authors: Nakamura
authors: Izumi C
authors: IC
authors: Mori
authors: Sumio
authors: S
authors: Iwai
authors: Yoshiyuki
authors: Y
authors: Murata
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology*; D000085:Acetates / Q000494:pharmacology; D003517:Cyclopentanes / Q000494:pharmacology; D009569:Nitric Oxide / Q000494:pharmacology; D054883:Oxylipins / Q000494:pharmacology; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D054046:Plant Stomata / Q000187:drug effects / Q000378:metabolism; D030821:Plants, Genetically Modified / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D031307:Vicia faba / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*
chemical_list: D000085:Acetates; D003517:Cyclopentanes; D054883:Oxylipins; D010940:Plant Proteins; D009569:Nitric Oxide; D000040:Abscisic Acid; C072239:methyl jasmonate