Osmotic regulation of root system architecture
Osmotic regulation of root system architecture
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DOI：
10.1111/j.1365-313x.2005.02425.x
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发表时间：
2005-07-01
期刊：
影响因子：
7.2
通讯作者：
Malamy, J
中科院分区：
文献类型：
--
作者：
Deak, KI;Malamy, J
虽然已知根系结构具有高度可塑性，并且受环境条件的强烈影响，但我们对控制根系发育的潜在机制知之甚少。在这里，我们证明了侧根原基的形成受到抑制，因为水的可用性降低。这种渗透反应调节机制需要脱落酸（ABA）和一个新发现的基因LRD2。突变体分析还揭示了ABA和LRD2与生长素信号的相互作用。令人惊讶的是，进一步的研究表明，即使在没有渗透胁迫的情况下，ABA和LRD2也能控制根系结构。这表明，介导对环境信号的反应的分子也可能是根系内在发育程序的调节器。
Although root system architecture is known to be highly plastic and strongly affected by environmental conditions, we have little understanding of the underlying mechanisms controlling root system development. Here we demonstrate that the formation of a lateral root from a lateral root primordium is repressed as water availability is reduced. This osmotic-responsive regulatory mechanism requires abscisic acid (ABA) and a newly identified gene, LRD2. Mutant analysis also revealed interactions of ABA and LRD2 with auxin signaling. Surprisingly, further examination revealed that both ABA and LRD2 control root system architecture even in the absence of osmotic stress. This suggests that the same molecules that mediate responses to environmental cues can also be regulators of intrinsic developmental programs in the root system.