植物在寒冷胁迫下H2O2和ABA信号分子的答研究进展

摘要

Abscisic acid (ABA),characterized as a messenger in plants under stress,has proven to participate in the intricate network of signaling pathways in cold acclimation.In addition,H2O2 could also play a role in the network under cold stress.Recent study on the two signals showed that both of them can exist as signal molecule and interact with each other.Many experiments indicated that H2O2 has been identified as the key molecule regulating ABA induced stomatal closure.Based on existing knowledge,ABA may pass to ABA receptor and then protein kinases to generate O2- first and then to produce H2O2.However,the signal transduction is a complicated process,it is not a simple relationship as downstream or upstream between ABA and H2O2,the exact role in the interaction between the two signaling components remains unknown.%脱落酸(ABA)作为最早研究的植物逆境信号分子,被大量实验证明参与了植物对低温的传导过程.此外,植物体内的H2O2亦可作为信号分子在寒冷胁迫下发挥作用.综述了两信号分子的研究进展,ABA和H2O2都能作为寒冷胁迫下的信号分子存在,并能形成交互作用的信号网络.同时在寒冷胁迫条件下,H2O2成为ABA诱导植物气孔关闭信号网络的重要因素之一.根据已有的报道推测,ABA可能通过质膜上的ABA受体蛋白,通过电子传导产生O2-进而酶促或非酶促产生H2O2.然而,植物细胞的信号传导过程是一个复杂交错的网络途径,ABA和H2O2并不可能只是一个简单的上下游关系,对其之间的准确的作用仍然需要进一步的深入研究.