Pseudomonas syringae pv. tomato Oxyr is required for virulence in tomato and arabidopsis

Yasuhiro Ishiga, Yuki Ichinose

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Reactive oxygen species (ROS) have been shown to have a crucial role in plant defense responses and signaling pathways. In addition, ROS also have direct toxicity against pathogens. However, the molecular mechanisms of plant ROS in the direct effects against pathogens is still unclear. To investigate the function of plant ROS in the interactions of plant and bacterial pathogens, we focused on oxyR, encoding an oxidative stressregulated transcription factor in Pseudomonas syringae pv. tomato DC3000 (DC3000), and generated an DoxyR mutant. The DC3000 DoxyR mutant showed high sensitivity to oxidative stress in comparison with wild type and the complemented line. The host plants of DC3000, including tomato and Arabidopsis inoculated with the DoxyR mutant, clearly showed reduced disease symptoms as well as reduced bacterial populations. Expression profiles of DC3000 genes revealed that OxyR could regulate the expression of genes encoding ROS-detoxifying enzymes, including catalases (KatB and KatG), in response to ROS. We also demonstrated that the expression of katB could be regulated by OxyR during the infection of DC3000 in Arabidopsis. These results suggest that OxyR has an important role in the virulence of DC3000 by regulating the expression of genes related to oxidative stress.

Original languageEnglish
Pages (from-to)119-131
Number of pages13
JournalMolecular Plant-Microbe Interactions
Volume29
Issue number2
DOIs
Publication statusPublished - Feb 1 2016

Fingerprint

Pseudomonas syringae
Pseudomonas syringae pv. tomato
Lycopersicon esculentum
Arabidopsis
Virulence
reactive oxygen species
Reactive Oxygen Species
virulence
tomatoes
mutants
pathogens
Oxidative Stress
oxidative stress
Gene Expression
gene expression
Transcriptome
Catalase
signs and symptoms (plants)
catalase
Transcription Factors

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science

Cite this

Pseudomonas syringae pv. tomato Oxyr is required for virulence in tomato and arabidopsis. / Ishiga, Yasuhiro; Ichinose, Yuki.

In: Molecular Plant-Microbe Interactions, Vol. 29, No. 2, 01.02.2016, p. 119-131.

Research output: Contribution to journalArticle

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