Graduate School of Natural Science and Technology, Division of Bioscience, Faculty of Agriculture, Okayama University, Okayama, 700-8530, Japan.
J Exp Bot. 2012 Feb;63(3):1357-65. doi: 10.1093/jxb/err369. Epub 2011 Nov 29.
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.
先前已分离出脱落酸（ABA）不敏感的蚕豆突变体 fia（ABA 诱导气孔关闭受损的蚕豆）。本研究旨在探究 FIA 在蚕豆保卫细胞中 ABA 信号转导中的作用。与 ABA 不同的是，茉莉酸甲酯（MeJA）、H2O2 和一氧化氮（NO）诱导 fia 突变体的气孔关闭。ABA 不会诱导突变体中活性氧或 NO 的产生。此外，ABA 不能抑制内向整流钾（K（in））电流或激活突变体保卫细胞中的 ABA 激活蛋白激酶（AAPK）。这些结果表明，FIA 作为 ABA 信号转导中 AAPK 激活的上游早期信号组分发挥作用，但在蚕豆保卫细胞中不参与 MeJA 信号转导。
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