植物ABA-H_2O_2介导的气孔关闭

Stomatal Closure Mediated by ABA-H2O2 in Plants

本文综述了脱落酸作为根源信号物质经由木质部被传递到叶片,经重新分配再与脱落酸受体结合,然后刺激气孔开放因子,调节烟酰胺腺嘌呤二核苷酸磷酸氧化酶等关键酶活性产生过氧化氢,过氧化氢可使胞质碱化并刺激钙离子通道使钙离子内流,活化阴离子通道使阴离子外流,最终导致气孔关闭的一系列过程。该过程涉及到的因子包括:脱落酸受体、气孔开放因子、磷脂酰环己六醇、分裂原激活蛋白激酶、烟酰胺腺嘌呤二核苷酸磷酸氧化酶、Ca2+、pH、一氧化氮等。

This paper summarized a series of processes in which abscisic acid （ABA） as a root source signal induces stomatal closure. Free ABA is transported to leaf by xylem, redistributed in leaf and combined with ABA receptor. The conjugated ABA activates open stomata 1 （OST1） and thereafter regulates the activities of key enzymes such as nicotinamide adenine dinucleotide phosphate oxidase （NOX）, which results in the biosynthesis of H2O2. H2O2 can facilitate the cytoplasmic alkalinization and activate calcium ion channels, which leads to the influx of calcium ions and stimulate anion channels so as to trigger the efflux of anion. The factors involved in this process include ABA receptor, OST1, phosphatidylinositol （PI）, mitogen-activated protein kinase （MAPK）, NOX, Ca^（2＋）, pH, nitric oxide （NO） and so on.