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Pattern-Triggered Oxidative Burst and Seedling Growth Inhibition Assays in Arabidopsis thaliana
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An RbohC and RbohE-mediated ROS oscillatory circuit regulates root cap turnover in Arabidopsis.

Ye-Sol Shin1, Woo-Taek Jeon1, Hoon Jung2

  • 1School of Biological Sciences, Seoul National University, Seoul 08826, Republic of Korea.

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|December 24, 2025
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Summary

Reactive oxygen species (ROS) oscillations regulate root cap cell turnover in Arabidopsis. This redox mechanism, involving RbohC/E and ANAC33, coordinates cell detachment and division for root protection.

Keywords:
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Area of Science:

  • Plant Biology
  • Cell Biology
  • Developmental Biology

Background:

  • The root tip is crucial for plant growth and faces environmental stresses.
  • The root cap protects the root tip through dynamic cell turnover.
  • Columella root cap turnover involves the detachment of outer cells.

Purpose of the Study:

  • To investigate the role of reactive oxygen species (ROS) in columella root cap turnover.
  • To identify the molecular mechanisms regulating ROS production and signaling in the columella.

Main Methods:

  • Utilized Arabidopsis thaliana as a model organism.
  • Manipulated ROS levels using chemical inhibitors and exogenous ROS.
  • Investigated gene expression and protein localization of ROS-producing enzymes and transcription factors.
  • Analyzed auxin distribution using PIN-FORMED2 transporter.

Main Results:

  • ROS levels oscillate during columella development in Arabidopsis.
  • Disruption of ROS oscillations impairs columella cell division and detachment.
  • RbohC and RbohE are identified as key ROS producers, negatively regulated by ANAC33/SOMBRERO.
  • ROS oscillations influence auxin distribution by modulating PIN-FORMED2.

Conclusions:

  • A redox-based mechanism integrates ROS and auxin signaling to control columella root cap turnover.
  • This mechanism is essential for coordinating cell division and detachment in the root cap.
  • Findings provide insights into plant root development and stress response.