植物赤霉素生物合成和信号传导的分子生物学

赤霉素 (GAs)在植物的种子萌发、茎的伸长和花的发育等许多方面起着非常重要的作用。最近几年 ,对GA生物合成及其信号传导途径相关基因的研究取得了惊人的进展。这些进展促进了对其生物合成及其信号传导途径的认识。GA生物合成相关基因的表达受到多种内源和外源因子的调控 ,其中研究较多的是发育阶段、激素水平和光信号等内源及环境因子的调控。GA信号传导通常处于抑制状态 ,GA信号通过去抑制作用激活该传导途径而促进GA刺激植物生长和发育。

Molecular Biology of the Plant Gibberellin Biosynthesis and Signaling

Hormone gibberellins (GAs) play an essential role in many aspects of plant growth and development, such as seed germination, stem elongation and flower development. In recent years, exciting progress has been made in identifying many genes involved in gibberellin biosynthesis and the gibberellin signal transduction pathway. This has helped us to understand these pathways and their regulation. The expression of gibberellin biosynthesis genes are regulated by several endogenous and environmental factors , including developmental stage, hormone status and light. The basal state of GA signaling is likely to be repressive and the GA signal seems to activate the pathway by de_repression to allow GA_stimulated growth and development.