The Mg-chelatase H subunit is an abscisic acid receptor
The Mg-chelatase H subunit is an abscisic acid receptor
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DOI：
10.1038/nature05176
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发表时间：
2006-10-19
期刊：
影响因子：
64.8
通讯作者：
Zhang, Da-Peng
中科院分区：
文献类型：
--
作者：
Shen, Yuan-Yue;Wang, Xiao-Fang;Zhang, Da-Peng
脱落酸（阿坝）是一种重要的植物激素，主要调节气孔开度和种子发育，但参与这些过程的阿坝受体尚未确定。我们以前确定蚕豆ABA结合蛋白（ABAR）可能参与气孔信号，该基因编码的H亚基的镁螯合酶（CHLH），这是一个关键组成部分，在叶绿素的生物合成和质体到核信号。在这里，我们表明，拟南芥ABAR/CHLH特异性结合阿坝，并介导阿坝信号作为一个积极的调节种子萌发，萌发后的生长和气孔运动，表明ABAR/CHLH是一个阿坝受体。我们还表明，ABAR/CHLH是一个普遍存在的蛋白质表达的绿色和非绿色组织，表明它可能能够感知阿坝信号在整个植物水平。
Abscisic acid (ABA) is a vital phytohormone that regulates mainly stomatal aperture and seed development, but ABA receptors involved in these processes have yet to be determined. We previously identified from broad bean an ABA-binding protein (ABAR) potentially involved in stomatal signalling, the gene for which encodes the H subunit of Mg-chelatase (CHLH), which is a key component in both chlorophyll biosynthesis and plastid-to-nucleus signalling. Here we show that Arabidopsis ABAR/CHLH specifically binds ABA, and mediates ABA signalling as a positive regulator in seed germination, post-germination growth and stomatal movement, showing that ABAR/CHLH is an ABA receptor. We show also that ABAR/CHLH is a ubiquitous protein expressed in both green and non-green tissues, indicating that it might be able to perceive the ABA signal at the whole-plant level.