生物钟
昼夜节律
延伸率
根毛
生物
拟南芥
开枪
下胚轴
句号(音乐)
植物
细胞生物学
神经科学
遗传学
基因
材料科学
物理
突变体
声学
冶金
极限抗拉强度
作者
H. Ikeda,Taiga Uchikawa,Yohei Kondo,Nozomu Takahashi,Takuma Shishikui,Hisashi Ito,Akane Kubota,Motomu Endo
出处
期刊:Plant and Cell Physiology
[Oxford University Press]
日期:2023-07-19
卷期号:64 (11): 1289-1300
被引量:4
摘要
Abstract Plants adapt to periodic environmental changes, such as day and night, by using circadian clocks. Cell division and elongation are primary steps to adjust plant development according to their environments. In Arabidopsis, hypocotyl elongation has been studied as a representative model to understand how the circadian clock regulates cell elongation. However, it remains unknown whether similar phenomena exist in other organs, such as roots, where circadian clocks regulate physiological responses. Here, we show that root hair elongation is controlled by both light and the circadian clock. By developing machine-learning models to automatically analyze the images of root hairs, we found that genes encoding major components of the central oscillator, such as TIMING OF CAB EXPRESSION1 (TOC1) or CIRCADIAN CLOCK ASSOCIATED1 (CCA1), regulate the rhythmicity of root hair length. The partial illumination of light to either shoots or roots suggested that light received in shoots is mainly responsible for the generation of root hair rhythmicity. Furthermore, grafting experiments between wild-type (WT) and toc1 plants demonstrated that TOC1 in shoots is responsible for the generation of root hair rhythmicity. Our results illustrate the combinational effects of long-distance signaling and the circadian clock on the regulation of root hair length.
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