Section of Molecular Cell and Developmental Biology, University of Texas, Austin, TX 78712, USA.
Curr Opin Plant Biol. 2011 Dec;14(6):700-6. doi: 10.1016/j.pbi.2011.07.013. Epub 2011 Aug 19.
Although no definitive receptor for extracellular ATP (eATP) has been identified in plants, there is now stronger physiological evidence that the effects of eATP on plant growth are mediated by a receptor, or, as in animals, by multiple receptors. Recent papers clarify how extracellular nucleotides induce changes in Ca(2+), and the production of nitric oxide (NO) and reactive oxygen species. They document links between eATP signaling and the synthesis or transport of hormones, and they reveal that applied nucleotides can regulate the aperture of stomates, which release ATP when stimulated by light and hormones. Ectoapyrases (ecto-nucleoside triphosphate-diphosphohydrolase) help control both the diverse signaling changes and downstream growth changes induced by extracellular nucleotides by limiting their concentration in the extracellular matrix (ECM).
尽管尚未在植物中鉴定出细胞外 ATP（eATP）的明确受体，但现在有更强的生理学证据表明，eATP 对植物生长的影响是通过受体介导的，或者与动物一样，通过多个受体介导的。最近的一些论文阐明了细胞外核苷酸如何诱导 Ca(2+)的变化，以及一氧化氮 (NO)和活性氧的产生。它们记录了 eATP 信号与激素的合成或运输之间的联系，并揭示了施加的核苷酸可以调节气孔的开度，当气孔受到光和激素的刺激时，它们会释放 ATP。外切核苷酸三磷酸二磷酸水解酶（ecto-apyrases）通过限制细胞外基质（ECM）中核苷酸的浓度，有助于控制由细胞外核苷酸诱导的各种信号变化和下游生长变化。
