生长素与植物叶片衰老调控

Auxin and leaf senescence regulation

作为植物叶片发育的最后一个阶段,叶片衰老的启动和进程由遗传程序严格控制,并受到内外源不同因子的协同调控.多种植物激素对叶片的衰老发挥重要的调控作用,目前认为乙烯、脱落酸、水杨酸、茉莉酸和油菜素甾醇等激素促进植物叶片衰老,而细胞分裂素和赤霉素则抑制植物叶片衰老.传统观念曾认为生长素对植物叶片衰老起负调节作用,但近年来越来越多的实验证据表明生长素是叶片衰老的正调节因子.本文旨在对生长素在叶片衰老调控中的功能和研究历程进行简要综述,为进一步理解植物叶片衰老调控中的激素功能奠定基础.

As the last stage of leaf development,the initiation and progression of leaf senescence are tightly controlled by genetic programing and coordinated by both internal and external factors.Plant hormone is one of the important internal factors that affect leaf senescence.It is widely acknowledged that ethylene,abscisic acid,salicylic acid,jasmonic acid and brassinosteroids accelerate leaf senescence,while cytokinin and gibberellin delay leaf senescence.It was generally believed that auxin negatively regulates leaf senescence,but more and more recent studies show that auxin is a positive regulator of leaf senescence.This review aims to summarize the research progress in this field and to lay a foundation for a better understanding towards the function of auxin in leaf senescence regulation.