Advances on Molecular Mechanism of Auxin in Rice Root

doi:10.3969/j.issn.1006-8082.2014.04.001

Abstract

Abstract: Rice root is the main organ for nutrient and water absorption, its growth and development are regulated by several plant hormones collaboratively. Of which，auxin is the extensively studied. In this paper, the author elucidate the development process and molecular mechanism of rice root architecture by analyzing the regulating genes that have been cloned. Comprehensive analysis reveals that the root shape is altered by auxin biosynthesis genes that regulate auxin concentration. Auxin transport regulate the development of lateral root and crown root through controlling auxin influx and efflux. Auxin signal transduction, which affects the root system, is regulated by TIR1、Aux/IAA and ARF. Besides the distrubition of auxin is influenced by acting with other plant hormones. However，these cloned root shape genes in rice is still insufficient, and the outline of molecular regulation network of auxin is not clear. Therefore，it is important to further understand molecular mechanism of auxin in rice root by screening and collecting rice auxin mutants with root mutations.

Key words: rice, root morphology, auxin, gene, molecular mechanism

摘要： 水稻根系是非常重要的吸收营养和水分的器官，其生长与发育受多个植物激素协同调控。本文综述了生长素对水稻根形态建成调控的分子遗传学研究进展，影响生长素合成的YUCCA基因是通过控制生长素在植株体内的浓度来改变根的形态。而生长素运输主要通过调控生长素输出载体PIN和生长素输入载体AUXI的极性分布，影响侧根和不定根的发育，以及根的向重性。此外，TIR1、Aux/IAA与ARF互作在生长素信号转导中起重要的调控作用。其他激素可以通过信号转导途径影响生长素的分布，调控根系统的建成。但目前水稻相关基因的克隆进展缓慢，对生长素调控网络认识还不够清晰。因此，更为深入的研究水稻生长素相关基因将对理解水稻根系发育的分子机制具有重要意义。

关键词: 水稻, 根形态建成, 生长素, 基因, 分子机制

CLC Number:

S511

KANG Shu-Jing-12, QIAN Qian-1, ZHU Li-1 *. Advances on Molecular Mechanism of Auxin in Rice Root[J]. , 2014, 20(4): 1-8.

康书静12, 钱前1, 朱丽1 *. 生长素对水稻根系生长发育调控的研究进展[J]. 中国稻米, 2014, 20(4): 1-8.

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