Zhao Chenchen, Cai Shengguan, Wang Yizhou, Chen Zhong-Hua
a School of Science and Health, Hawkesbury Institute for the Environment, Western Sydney University , Penrith , Australia.
b Laboratory of Plant Physiology and Biophysics, Bower Building, University of Glasgow , Glasgow , United Kingdom.
Plant Signal Behav. 2016 Jun 2;11(6):e1183088. doi: 10.1080/15592324.2016.1183088.
Nitrate reductases NIA1 and NIA2 determine NO production in plants and are critical to abscisic acid (ABA)-induced stomatal closure. However, the role for NIA1 and NIA2 in ABA signaling has not been paid much attention in nitrate reductase loss-of-function mutant nia1nia2. Recently, we have demonstrated that ABA-inhibited K(+)in current and ABA-enhanced slow anion current were absent in nia1nia2. Exogenous NO restored regulation of these channels for stomatal closure in nia1nia2. In this study, we found that mutating NIA1 and NIA2 impaired nearly all the key components of guard cell ABA signaling pathway in Arabidopsis. We also propose a simplified model for ABA signaling in the nia1nia2 mutant.
硝酸还原酶NIA1和NIA2决定植物中一氧化氮（NO）的产生，并且对于脱落酸（ABA）诱导的气孔关闭至关重要。然而，在硝酸还原酶功能缺失突变体nia1nia2中，NIA1和NIA2在ABA信号传导中的作用尚未得到足够关注。最近，我们已经证明，nia1nia2中不存在ABA抑制的内向钾离子电流和ABA增强的慢阴离子电流。外源NO恢复了nia1nia2中这些用于气孔关闭的通道的调节。在本研究中，我们发现突变NIA1和NIA2会损害拟南芥保卫细胞ABA信号通路的几乎所有关键组分。我们还提出了nia1nia2突变体中ABA信号传导的简化模型。
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