Genetic analysis of the gravitropic set-point angle in lateral roots of Arabidopsis
Genetic analysis of the gravitropic set-point angle in lateral roots of Arabidopsis
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DOI：
10.1016/s0273-1177(03)00249-7
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发表时间：
2003-01-01
期刊：
影响因子：
--
通讯作者：
Hangarter, RP
中科院分区：
文献类型：
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作者：
Mullen, JL;Hangarter, RP
植物重力响应的研究主要集中在主根和芽，通常定向到垂直方向。然而，侧生器官的分布和它们特有的非垂直生长方向对于植物形态的决定至关重要。例如，在拟南芥中，当侧根从主根中出现时，它们几乎以水平方向生长。当它们伸长时，根部慢慢弯曲，直到它们最终达到垂直方向。这种侧根方向的调节是影响整个根系结构的重要组成部分。我们发现，这种方向的变化是不是简单地由于向地性能力的发病，非垂直侧根能够积极和消极的向地性。因此，新侧根的水平生长似乎是由所谓的向重力设定点角（GSA）决定的。拟南芥侧根GSA的发育控制提供了一个有用的系统，调查参与调节向重力反应的组件。使用这个系统，我们已经确定了几个Ardbidopsis突变体，改变侧根的方向，但保持正常的主根方向。(C)2003年空间研委会。由爱思唯尔有限公司出版。保留所有权利。
Research on gravity responses in plants has mostly focused on primary roots and shoots, which typically orient to a vertical orientation. However, the distribution of lateral organs and their characteristically non-vertical growth orientation are critical for the determination of plant form. For example, in Arabidopsis, when lateral roots emerge from the primary root, they grow at a nearly horizontal orientation. As they elongate, the roots slowly curve until they eventually reach a vertical orientation. The regulation of this lateral root orientation is an important component affecting overall root system architecture. We found that this change in orientation is not simply due to the onset of gravitropic competence, as non-vertical lateral roots are capable of both positive and negative gravitropism. Thus, the horizontal growth of new lateral roots appears to be determined by what is called the gravitropic set-point angle (GSA). This developmental control of the GSA of lateral roots in Arabidopsis provides a useful system for investigating the components involved in regulating gravitropic responses. Using this system, we have identified several Ardbidopsis mutants that have altered lateral root orientations but maintain normal primary root orientation. (C) 2003 COSPAR. Published by Elsevier Ltd. All rights reserved.