The plant hormone auxin beats the time for oscillating light-regulated lateral root induction
The plant hormone auxin beats the time for oscillating light-regulated lateral root induction
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DOI：
10.1242/dev.169839
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发表时间：
2018-12-01
期刊：
影响因子：
4.6
通讯作者：
Schopfer, Peter
中科院分区：
文献类型：
--
作者：
Kircher, Stefan;Schopfer, Peter
侧根是植物发育中时钟驱动器官形成的典型例子，其周期性诱导的分子机制一直是一个有争议的问题。在这里，我们提供了实验证据，证明这个时钟是由光调制的，并且在拟南芥幼苗侧根形成之前，生长素充当了将连续光信号转换为不连续基因激活信号的中介。基于这一证据，我们提出了一个涉及生长素依赖性降解的AUX/ iaa型转录抑制因子作为灵活的频率控制延迟元件的超昼夜生物钟的分子模型。该模型通过增加一种新的类型，使器官形成的速度能够适应生长植物不断变化的环境需求，从而拓宽了生物钟的带宽。
The molecular mechanism underlying the periodic induction of lateral roots, a paradigmatic example of clock-driven organ formation in plant development, is a matter of ongoing, controversial debate. Here, we provide experimental evidence that this clock is frequency modulated by light and that auxin serves as a mediator for translating continuous light signals into discontinuous gene activation signals preceding the initiation of lateral roots in Arabidopsis seedlings. Based on this evidence, we propose a molecular model of an ultradian biological clock involving auxin-dependent degradation of an AUX/IAA-type transcription repressor as a flexible, frequency-controlling delay element. This model widens the bandwidth of biological clocks by adding a new type that allows the pace of organ formation to adapt to the changing environmental demands of the growing plant.