MYB30 Orchestrates Systemic Reactive Oxygen Signaling and Plant Acclimation

Area of Science:

• Plant biology
• Molecular biology
• Stress physiology

Background:

• Systemic acquired acclimation (SAA) is vital for plant survival against abiotic stress.
• Reactive oxygen species (ROS) waves mediate SAA in Arabidopsis, with MYB30 acting downstream.
• The specific role of MYB30 in systemic signaling and SAA remained unclear.

Purpose of the Study:

• To investigate the relationship between MYB30, ROS waves, and systemic acclimation in Arabidopsis under high light (HL) stress.
• To elucidate MYB30's function in mediating systemic responses to abiotic stress.

Main Methods:

• Comparative analysis of SAA response to HL stress in *myb30* mutants and wild-type Arabidopsis.
• Assessment of ROS wave propagation rates and systemic transcriptomic profiles.
• Identification of core transcripts regulated by MYB30 during HL stress.

Main Results:

• *myb30* mutants showed faster ROS wave propagation and local acclimation but deficient SAA to HL stress.
• Systemic transcriptomic responses were impaired in *myb30* mutants, with over 3,500 transcripts underexpressed.
• A set of 150 core transcripts potentially regulated by MYB30 during HL stress was identified.

Conclusions:

• MYB30 is a critical regulator connecting systemic ROS signaling with transcriptomic responses and SAA in plants.
• Plant acclimation and systemic ROS signaling are interconnected, with impaired acclimation potentially accelerating ROS signaling via feedback mechanisms involving MYB30.