A role for the root cap in root branching revealed by the non-auxin probe naxillin.
A role for the root cap in root branching revealed by the non-auxin probe naxillin.
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DOI：
10.1038/nchembio.1044
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发表时间：
2012-09
影响因子：
14.8
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中科院分区：
文献类型：
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植物根系对水分和养分的吸收是农业生产的一个基本方面，并且在很大程度上取决于根系构型。根的分枝和根系的扩展是通过侧根的发育实现的，并且在很大程度上由植物激素生长素控制。然而，生长素或生长素样分子对根系的多效性作用使侧根发育的研究变得复杂。在这里，我们描述了一个小分子筛选拟南芥，确定naxillin是什么，我们所知的第一个非生长素样分子，促进根分支。通过使用naxillin作为化学工具，我们确定了一个新的功能，生长素前体吲哚-3-丁酸的根冠特异性转化为活性生长素吲哚-3-乙酸，并揭示了根冠参与根分支。生长素前体在根冠等外周组织中的传递可能是形成根结构的重要机制。
The acquisition of water and nutrients by plant roots is a fundamental aspect of agriculture and strongly depends on root architecture. Root branching and expansion of the root system is achieved through the development of lateral roots and is to a large extent controlled by the plant hormone auxin. However, the pleiotropic effects of auxin or auxin-like molecules on root systems complicate the study of lateral root development. Here we describe a small-molecule screen in Arabidopsis thaliana that identified naxillin as what is to our knowledge the first non-auxin-like molecule that promotes root branching. By using naxillin as a chemical tool, we identified a new function for root cap-specific conversion of the auxin precursor indole-3-butyric acid into the active auxin indole-3-acetic acid and uncovered the involvement of the root cap in root branching. Delivery of an auxin precursor in peripheral tissues such as the root cap might represent an important mechanism shaping root architecture.