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dc.contributor.authorNisanart Charoenlapen_US
dc.contributor.authorSarinya Buranajitpakornen_US
dc.contributor.authorJintana Duang-Nkernen_US
dc.contributor.authorPoommaree Namchaiwen_US
dc.contributor.authorPaiboon Vattanaviboonen_US
dc.contributor.authorSkorn Mongkolsuken_US
dc.contributor.otherChulabhorn Research Instituteen_US
dc.contributor.otherChulabhorn Graduate Instituteen_US
dc.contributor.otherCenter of Excellence on Environmental Healthen_US
dc.contributor.otherMahidol Universityen_US
dc.identifier.citationCurrent Microbiology. Vol.63, No.2 (2011), 232-237en_US
dc.description.abstractXanthomonas campestris pv. campestris causes black rot in cruciferous crops. Hydrogen peroxide (H 2 O 2 ) production and accumulation is an important initial response in plant defense against invading microbes. The role of genes involved in the bacterial H 2 O 2 protection system in pathogenicity was evaluated. Mutants of katA (encoding a monofunctional catalase) and, to a lesser extent, katG (encoding a catalase-peroxidase) and oxyR (encoding a H 2 O 2 sensor and a transcription regulator), are hypersensitive to H2O2 treatments that mimic the plant H 2 O 2 burst. These data correlate with the results of pathogenicity testing that show katA, katG, and oxyR mutants are avirulent on a compatible plant. Moreover, exposure to H 2 O 2 (1, 2, and 4 mM) highly induces the expression of genes in the OxyR regulon, including katA, katG, and ahpC. The avirulent phenotype of the oxyR mutant is partly because of its inability to mount an adaptive response upon exposure to an H 2 O 2 burst. Our data provide insights into important roles of a transcription regulator and other genes involved in peroxide stress protection in the virulence of X. campestris pv. campestris. © Springer Science+Business Media, LLC 2011.en_US
dc.rightsMahidol Universityen_US
dc.subjectImmunology and Microbiologyen_US
dc.titleEvaluation of the Virulence of Xanthomonas campestris pv. campestris Mutant Strains Lacking Functional Genes in the OxyR Regulonen_US
Appears in Collections:Scopus 2011-2015

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