拟南芥下胚轴伸长与向光性的分子调控机理

Molecular Regulatory Mechanisms of Hypocotyl Elongation and Phototropism in Arabidopsis

下胚轴快速伸长和向光性是高等植物进行固着生活的重要适应性机制,是子叶钻出土层进行光形态发生和光合作用的必要前提。拟南芥下胚轴因其简单的生理形态结构和特异的生理功能而成为剖析植物细胞伸长和向性生长的理想模式系统。本文主要介绍光和植物激素调控拟南芥下胚轴伸长和向光性弯曲的生理基础、遗传学功能及其分子调控机理的最新进展。

Rapid elongation and phototropism of the hypocotyl, which are essential for the young seedling to perceive light and undergo photomorphogenesis and photosynthesis, are important adaptive mechanisms for plant sessile life. The Arabidopsis hypocotyl is an ideal model system to dissect cell elongation and tropic growth in plants due to its simple physiological and morphological structure and specific physiological roles. This review focused on physiological basis and genetic functions of light- and phytohormone-regulated hypo- cotyl elongation and phototropism, and recent progresses on their regulatory molecular mechanisms in Arabidopsis thaliana.