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Title: Evaluation of the Virulence of Xanthomonas campestris pv. campestris Mutant Strains Lacking Functional Genes in the OxyR Regulon
Authors: Nisanart Charoenlap
Sarinya Buranajitpakorn
Jintana Duang-Nkern
Poommaree Namchaiw
Paiboon Vattanaviboon
Skorn Mongkolsuk
Chulabhorn Research Institute
Chulabhorn Graduate Institute
Center of Excellence on Environmental Health
Mahidol University
Keywords: Immunology and Microbiology
Issue Date: 1-Aug-2011
Citation: Current Microbiology. Vol.63, No.2 (2011), 232-237
Abstract: Xanthomonas 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.
ISSN: 14320991
Appears in Collections:Scopus 2011-2015

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