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Free radicals mediate systemic acquired resistance.

Caixia Wang1, Mohamed El-Shetehy2, M B Shine2

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Nitric oxide (NO) and reactive oxygen species (ROS) induce plant systemic acquired resistance (SAR) concentration-dependently. This NO/ROS signaling pathway acts in parallel with salicylic acid (SA) for optimal plant defense.

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Area of Science:

  • Plant pathology
  • Plant physiology
  • Molecular biology

Background:

  • Systemic acquired resistance (SAR) confers broad-spectrum protection against plant pathogens.
  • Understanding the signaling networks that regulate SAR is crucial for agricultural applications.
  • The interplay between different signaling molecules in SAR induction requires further elucidation.

Purpose of the Study:

  • To investigate the role of nitric oxide (NO) and reactive oxygen species (ROS) in inducing SAR.
  • To elucidate the signaling cascade involving NO, ROS, azelaic acid (AzA), and glycerol-3-phosphate (G3P) in SAR.
  • To determine how NO/ROS-mediated signaling interacts with salicylic acid (SA)-dependent pathways.

Main Methods:

  • Analysis of plant mutants affecting NO/ROS production or accumulation (e.g., GSNOR mutants).
  • Assessment of SAR induction in response to varying concentrations of NO and ROS.
  • Quantification of AzA and G3P levels.
  • Comparative analysis of NO/ROS and SA signaling pathways.

Main Results:

  • NO and ROS act as concentration-dependent inducers of SAR.
  • Genetic alterations in NO/ROS metabolism disrupt SAR.
  • ROS contribute additively to AzA production, which then induces G3P.
  • The NO/ROS→AzA→G3P pathway operates in parallel with SA signaling.

Conclusions:

  • NO and ROS are key signaling molecules that initiate SAR.
  • A novel signaling pathway involving NO, ROS, AzA, and G3P contributes to SAR.
  • Parallel signaling by NO/ROS and SA pathways allows for coordinated regulation of plant defense.