植物根毛细胞的发生、分化和伸长受转录因子，植物激素和环境信号的调控。近年来对植物根毛发育的分子遗传机理研究虽取得了很大进展，但其详尽的分子机制，特别是转录因子通过植物激素和营养胁迫控制根毛形成的报道甚少。最近，我们从拟南芥中克隆ZFP5的2个同源基因，ZFP5-LIKE1和ZFP5-LIKE2。前期研究结果显示，它们在根中特异表达，它们的突变体表现为根毛数量和长度显著减少。同ZFP5基因主要参与根毛细胞命运决定不同，这2个基因可能主要参与根毛细胞命运决定后的分化和伸长。此外，我们前期研究结果还显示ZFP5-LIKE1 基因受低磷胁迫调控根毛细胞的伸长。锌指蛋白基因通过营养胁迫调控根毛的生长，还未有报道。本申请项目将应用外源激素和营养胁迫实验，突变体与调控根毛发生、根毛分化和伸长关键基因的遗传学分析，基因芯片等技术，初步探索ZFP5家族基因调控根毛细胞形成的分子作用机制。

The occurrence, differentiation and elongation of root hair cells are controlled by multiple transcription factors, plant hormones and environmental signals. In recent years, progress had been made in the uncovering the molecular mechanism of root cell development, however, the detailed molecular mechanism, in particular how transcription factors control root hair development throught plant hormone and nutrient stress, has hardly been reported. We have recently cloned two ZFP5 homologous genes, ZFP5-LIKE1 and ZFP5-LIKE2. Our prelimenary results had shown that they are mainly expressed in root and the mutants of these two genes showed significant reductions on the number and length of root hairs. Furthermore, our prelimenary restuls also had shown that ZFP5-LIKE1 might control root hair elongation through low P stress. Zinc finger protoin contorls root hair elongation through nutrient stress signal has not yet reported before. This project will use molecular techniques, such as the applications of exogenous hormone and nutrients stress,genetic analysis of mutants in related to the key genes contorling the root hair initiation,differentiationn and elongation and gene microarray to explore the molecular mechanisms of the ZFP5 family gene controling root hair development in Arabidposis.