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Circadian Clock Controls Root Hair Elongation through Long-Distance Communication.

Hikari Ikeda1, Taiga Uchikawa1, Yohei Kondo2

  • 1Graduate School of Science and Technology, Nara Institute of Science and Technology, Ikoma, 630-0192 Japan.

Plant & Cell Physiology
|August 8, 2023
PubMed
Summary
This summary is machine-generated.

Plant root hair growth is regulated by light and the internal circadian clock. Shoot-received light and the TOC1 gene in shoots primarily control this root hair rhythmicity, demonstrating long-distance signaling effects.

Keywords:
Arabidopsis thalianaCircadian clockDeep learningRoot hairTOC1

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Area of Science:

  • Plant Biology
  • Chronobiology
  • Molecular Genetics

Background:

  • Plants utilize circadian clocks to adapt to daily environmental changes.
  • Hypocotyl elongation in Arabidopsis is a model for circadian clock regulation of cell growth.
  • The role of circadian clocks in root development, specifically root hair elongation, is not well understood.

Purpose of the Study:

  • To investigate the regulation of root hair elongation by light and the circadian clock.
  • To determine the signaling pathways involved in root hair growth rhythmicity.

Main Methods:

  • Utilized machine-learning models for automated root hair image analysis.
  • Performed partial light illumination experiments on shoots and roots.
  • Conducted grafting experiments between wild-type and toc1 mutant Arabidopsis.

Main Results:

  • Root hair elongation is demonstrated to be controlled by both light and the circadian clock.
  • Key circadian clock genes (TOC1, CCA1) regulate the rhythmicity of root hair length.
  • Light perception in shoots, rather than roots, is crucial for generating root hair rhythmicity.
  • The TOC1 gene in shoots plays a vital role in establishing root hair growth rhythms.

Conclusions:

  • Circadian clock regulation of root hair elongation is light-dependent and influenced by shoot-derived signals.
  • Long-distance signaling from shoots, mediated by TOC1, integrates light cues to control root hair growth rhythmicity.
  • This study reveals the interplay between the circadian clock, light signaling, and long-distance communication in plant development.