Circadian Clock Controls Root Hair Elongation through Long-Distance Communication

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 un...

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Veröffentlicht in:Plant and cell physiology 2023-12, Vol.64 (11), p.1289-1300
Hauptverfasser: Ikeda, Hikari, Uchikawa, Taiga, Kondo, Yohei, Takahashi, Nozomu, Shishikui, Takuma, Watahiki, Masaaki K, Kubota, Akane, Endo, Motomu
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container_end_page 1300
container_issue 11
container_start_page 1289
container_title Plant and cell physiology
container_volume 64
creator Ikeda, Hikari
Uchikawa, Taiga
Kondo, Yohei
Takahashi, Nozomu
Shishikui, Takuma
Watahiki, Masaaki K
Kubota, Akane
Endo, Motomu
description 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.
doi_str_mv 10.1093/pcp/pcad076
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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. 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source MEDLINE; Oxford University Press Journals All Titles (1996-Current); EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection
subjects Arabidopsis - physiology
Arabidopsis Proteins - metabolism
Circadian Clocks - genetics
Circadian Rhythm - genetics
Gene Expression Regulation, Plant
Transcription Factors - genetics
Transcription Factors - metabolism
title Circadian Clock Controls Root Hair Elongation through Long-Distance Communication
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