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Updated: May 20, 2025

Pattern-Triggered Oxidative Burst and Seedling Growth Inhibition Assays in Arabidopsis thaliana
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Cytosolic Monodehydroascorbate Reductase 2 Promotes Oxidative Stress Signaling in Arabidopsis.

Dongdong Xu1, Lug Trémulot1, Zheng Yang1

  • 1Institut des Sciences des Plantes de Paris-Saclay, Unité Mixte de Recherche 8618 Centre National de la Recherche Scientifique, Université de Paris-Saclay, Gif-sur-Yvette, France.

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|March 26, 2025
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Summary

The cytosolic monodehydroascorbate reductase 2 (MDAR2) is crucial for plant defense responses during oxidative stress, despite being dispensable under normal conditions. This study characterizes its role in Arabidopsis thaliana.

Keywords:
antioxidantsascorbatecatalaseglutathioneoxidative stresspathogenesis‐related (PR)salicylic acid

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Area of Science:

  • Plant Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Oxidative stress impacts plant growth and defense.
  • Monodehydroascorbate reductase (MDHAR) enzymes are key in the ascorbate antioxidant system.
  • The specific roles of different MDHAR isoforms in planta are not fully understood.

Purpose of the Study:

  • To investigate the in planta importance of cytosolic and peroxisomal MDHAR isoforms during oxidative stress.
  • To characterize the functions of specific MDHAR genes in Arabidopsis thaliana.

Main Methods:

  • Generation and analysis of T-DNA mutants for MDAR genes encoding cytosolic and peroxisomal isoforms.
  • Crossing mdar mutants with a cat2 line (lacking catalase) to induce intracellular oxidative stress.
  • Enzyme assays on mdar mutants and recombinant MDHAR proteins.
  • Phenotypic and transcriptomic analysis of mutants under standard and stress conditions.

Main Results:

  • Peroxisomal MDHAR1 and cytosolic MDHAR2 are major contributors to leaf NADH- and NADPH-dependent MDHAR activities, respectively.
  • Mutants exhibited wild-type phenotypes under standard conditions.
  • In the cat2 background, loss of MDHAR1 impaired growth, while loss of MDAR2 affected oxidative stress responses, including salicylic acid levels and glutathione oxidation, without impacting growth.

Conclusions:

  • Cytosolic MDHAR2 is essential for promoting biotic defense responses triggered by oxidative stress.
  • MDHAR2 plays a critical role in mediating plant responses to oxidative stress, particularly in the context of defense mechanisms.