植物生长素极性运输调控机理的研究进展  

Current Research Advances on Polar Auxin Transport in Plant

作　　者：李俊华[1] 种康[1] 

机构地区：[1]中国科学院植物研究所光合作用与环境分子生理学重点实验室,北京100093

出　　处：《植物学通报》2006年第5期466-477,共12页Chinese Bulletin of Botany

基　　金：国家自然科学基金(No.30470866)

摘　　要：生长素极性运输特异地调控植物器官发生、发育和向性反应等生理过程。本文综述和分析了生长素极性运输的调控机制。分子遗传和生理学研究证明极性运输这一过程是由生长素输入载体和输出载体活性控制的。小G蛋白ARF附属蛋白GEF和GAP分别调控输出载体(PIN1)和输入载体(AUX1)的定位和活性,并影响高尔基体等介导的细胞囊泡运输系统,小G蛋白ROP也参与输出载体PIN2活性的调节。本文基于作者的研究工作提出小G蛋白在调控生长素极性运输中的可能作用模式。Polar auxin transport （PAT）, a unique process in plant modulates organogenesis, development and tropic response. Here we reviewed the regulation mechanism of PAT based on recent research progresses. Evidences on molecular genetics and physiology support a hypothesis that the process is depended on activities of auxin influx and efflux facilitators. Asymmetric distribution and activities of the efflux facilitator PIN1 and the influx facilitator AUX1 are impacted by a guanine-nucleotide exchange factor （GEF） for the ADP-ribosylation factor （ARF） and ARF-GTPase activating protein （ARF-GAP）, respectively, which are involved in Golgi stacks mediated vesicle trafficking. The activity of efflux facilitator PIN2 is modulated also by ROP, a small G protein in Arabidopsis. A hypothesis about the regulation of polar auxin transportation by ARF is suggested.

关 键 词：生长素极性运输 小G蛋白 鸟苷酸交换因子 GTPase激活蛋白 

分 类 号：Q945[生物学—植物学]