ARL1, a LOB-domain protein required for adventitious root formation in rice
ARL1, a LOB-domain protein required for adventitious root formation in rice
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DOI：
10.1111/j.1365-313x.2005.02434.x
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发表时间：
2005-07-01
期刊：
影响因子：
7.2
通讯作者：
Wu, P
中科院分区：
文献类型：
--
作者：
Liu, HJ;Wang, SF;Wu, P
不定根是禾谷类作物须根系统的主要组成部分。与目前对不定根发育的认识相比，对禾谷类植物不定根发育的分子机制的认识还很有限。我们分离并鉴定了一个控制水稻不定根原基发生的新基因。该基因被命名为不定根1（ARL1），编码一种具有外侧器官边界（LOB）结构域的蛋白质。它在侧根和不定根原基、分蘖原基、维管组织、盾片和幼花梗中表达。ARL1是一种核蛋白，可以形成同源二聚体。ARL1是一个生长素和乙烯反应基因，并且ARL1在根中的表达模式与生长素的分布平行。我们的研究结果表明，ARL1是一个生长素反应因子参与生长素介导的细胞去分化，它促进了初始细胞分裂的周细胞相邻的外周血管柱在干。
Adventitious roots constitute the bulk of the fibrous root system in cereals. Compared with the current understanding of shoot development, knowledge of the molecular mechanisms of development of the adventitious roots of cereals is limited. We have isolated and characterized a novel gene controlling the initiation of adventitious root primordia in rice (Oryza sativa L.). The gene, designated Adventitious rootless1 (ARL1), encodes a protein with a LATERAL ORGAN BOUNDARIES (LOB) domain. It is expressed in lateral and adventitious root primordia, tiller primordia, vascular tissues, scutellum, and young pedicels. ARL1 is a nuclear protein and can form homodimers. ARL1 is an auxin- and ethylene-responsive gene, and the expression pattern of ARL1 in roots parallels auxin distribution. Our findings suggest that ARL1 is an auxin-responsive factor involved in auxin-mediated cell dedifferentiation, and that it promotes the initial cell division in the pericycle cells adjacent to the peripheral vascular cylinder in the stem.