Mechanism and function of root circumnutation
Mechanism and function of root circumnutation
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DOI：
10.1073/pnas.2018940118
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发表时间：
2021-02-23
影响因子：
11.1
通讯作者：
Benfey, Philip N.
中科院分区：
文献类型：
--
作者：
Taylor, Isaiah;Lehner, Kevin;Benfey, Philip N.
早期根生长对于植物的建立和存活至关重要。我们已经确定了一个分子途径所需的螺旋根尖运动称为回旋。在这里，我们报告了对这种现象的调节和功能的多尺度调查。我们确定了关键的细胞信号事件，包括乙烯，细胞分裂素和生长素激素信号通路的相互作用。我们确定基因水稻组氨酸激酶-1（HK 1）以及生长素流入载体基因OsAUX 1作为水稻中这一过程的重要调控因子。机器人物理学建模和生长挑战实验表明，回旋是关键的幼苗建立在岩石土壤中，与长期存在的假设，根回旋有利于增长过去的障碍。因此，机器人学，物理学和生物学的整合已经阐明了根回旋的功能重要性，并揭示了其调控的分子机制。
Early root growth is critical for plant establishment and survival. We have identified a molecular pathway required for helical root tip movement known as circumnutation. Here, we report a multiscale investigation of the regulation and function of this phenomenon. We identify key cell signaling events comprising interaction of the ethylene, cytokinin, and auxin hormone signaling pathways. We identify the gene Oryza sativa histidine kinase-1 (HK1) as well as the auxin influx carrier gene OsAUX1 as essential regulators of this process in rice. Robophysical modeling and growth challenge experiments indicate circumnutation is critical for seedling establishment in rocky soil, consistent with the long-standing hypothesis that root circumnutation facilitates growth past obstacles. Thus, the integration of robotics, physics, and biology has elucidated the functional importance of root circumnutation and uncovered the molecular mechanisms underlying its regulation.