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Extracellular superoxide anion production contributes to the virulence of Xanthomonas oryzae pv. oryzae

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Endogenous superoxide anion production was determined by electron spin resonance in wild-type strains and avrXa7 mutants of Xanthomonas oryzae pv. oryzae. The localization of superoxide anion was carried out in the intra- and extra-cellular fractions. Results showed the presence of superoxide anion in multi-locations of X. oryzae pv. oryzae cells. The extracellular fraction was the major location of superoxide anion production. Furthermore, a positive relationship was shown between the levels of endogenous superoxide anion and the virulence of strains. These indubitable results suggested that the superoxide anion contributes to the virulence of X. oryzae pv. oryzae.

La production de l’anion superoxyde a été déterminée par la résonance du spin de l’électron chez des souches sauvages et des mutants avrXa7 de Xanthomonas oryzae pv. oryzae. La localisation de l’anion superoxyde a été exminée dans la fraction intra- ou extra-cellulaire. Les résultats démontrent la présence de l’anion superoxyde dans plusieurs endroits chez X. oryzae pv. oryzae. La production de l’anion superoxyde était principalement localisée dans la fraction extracellulaire. Qui plus est, une relation positive a été trouvée entre les niveaux endogènes de l’anion superoxyde et la virulence des souches. Ces résultats indubitables suggèrent que l’anion superoxyde contribue à la virulence de X. oryzae pv. oryzae.

Document Type: Research Article

Publication date: February 1, 2009

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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