高等植物赤霉素生物合成关键组分GA20-oxidase氧化酶基因的研究进展

Studies on the Gene of Key Component GA20-oxidase for Gibberellin Biosynthesis in Plant

GA-20氧化酶(GA-20 oxidase)是重要的GA生物合成和调控酶,直接催化生成有生物活性的GAs,是一种多功能酶,最显著的特点就是负反馈调节。GA20-氧化酶在植物发育和生理过程中起着重要的调控作用。综述了高等植物体内GA20氧化酶基因的克隆及表达调控研究及其对株高、纤维、开花、产量性状等影响,重点阐述了GA20氧化酶基因与激素、光周期、抗性等之间的相互作用,以便更好地揭示GA-20氧化酶信号网络系统及其作用机制。

GA20-oxidase,as a key synthetizing and regulating enzyme in the biosynthesis of gibberellic acid,directly regulates thegeneration of biological GAs.It is also a multifunctional enzyme,and its most important feature is negative feedback regulation.GA20-oxidaseplays an important regulating role in the development and physiological processes of plants.This article summarizes the recent studies on themolecular cloning and regulating expression analysis of GA20-oxidase genes and their effects on plant height,fiber formation,flowering,yieldtraits,etc.,and explains the interactions of GA20-oxidase gene with hormones,photoperiod,stress resistance and other factors,aiming atrevealing the signal network system and its mechanism of GA20-oxidase.