Laboratory for Molecular Biology; Department of Biological Sciences; University of Illinois at Chicago; Chicago, Illinois USA.
Plant Signal Behav. 2007 Nov;2(6):480-2. doi: 10.4161/psb.2.6.4497.
Different classes of biotic (e.g., plant hormones) and abiotic (e.g., different wavelengths of light) signals act through specific signal transduction mechanisms to coordinate all aspects of plant development. Full signal transduction chains have not yet been described for most light or hormonal-mediated events despite the wide range of events early in development which are dependent upon hormonal and light signals. We recently reported a single signal transduction chain which can be initiated by both blue light (BL) and ABA, and which leads to the expression of specific members of the Lhcb gene family in the apical bud of etiolated Arabidopsis seedlings. The signal transduction chain consists of GCR1 (one of two Arabidopsis proteins coding for a potential G-protein coupled receptor), GPA1 (the sole Arabidopsis Ga subunit), PRN1 (Pirin1, one of four members of an iron-containing subgroup of the cupin superfamily), and a Nuclear Factor -Y (NF-Y) heterotrimer comprised of A5, B9 and possibly C9. The same signaling proteins control ABA-mediated delay of germination.
不同类别的生物（如植物激素）和非生物（如不同波长的光）信号通过特定的信号转导机制发挥作用，协调植物发育的各个方面。尽管在发育早期有许多依赖激素和光信号的事件，但大多数光或激素介导的事件的完整信号转导链尚未被描述。我们最近报道了一个单一的信号转导链，它可以由蓝光（BL）和 ABA 共同启动，并导致拟南芥黄化幼苗顶芽中 Lhcb 基因家族特定成员的表达。信号转导链由 GCR1（编码潜在 G 蛋白偶联受体的两种拟南芥蛋白之一）、GPA1（拟南芥 Ga 亚基的唯一成员）、PRN1（Pirin1，含铁 cupin 超家族的四个成员之一）和核因子-Y（NF-Y）组成，由 A5、B9 和可能的 C9 组成异三聚体。相同的信号转导蛋白控制 ABA 介导的萌发延迟。
