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Ralstonia basilensis M91-3, a denitrifying soil bacterium capable of using s-triazines as nitrogen sources

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Abstract:



The purpose of this study was to characterize the phylogenetic and phenotypic traits of M91-3, a soil bacterium capable of mineralizing atrazine (2-chloro-4-N-isopropyl-6-N-ethyl-s-triazine). The isolate was identified as Ralstonia basilensis based on 99.5% homology of the 16S rRNA sequence and various chemotaxonomic data. The isolate used atrazine as the sole source of energy, carbon, and nitrogen. It could also use several other s-triazines as nitrogen sources. Ralstonia basilensis M91-3 was capable of denitrification, which was confirmed by gas chromatographic analysis of nitrous oxide under acetylene blockage conditions.Key words: atrazine biodegradation, denitrification, herbicide degrader, Ralstonia basilensis, triazine degradation.

L'objectif de cette étude fut de caractériser les traits phylogénétiques et phénotypiques de M91-3, une bactérie du sol capable de minéraliser l'atrazine (2-chloro-4-N-isopropyle-6-N-éthyle-s-triazine). Sur la base d'une homologie de 99,5% de la séquence de l'ARNr 16S et de diverses données chimiotaxonomiques, l'isolat a été identifié comme étant Ralstonia basilensis. L'isolat a utilisé l'atrazine comme seule source d'énergie, de carbone et d'azote. Il a également pu utiliser un certain nombre d'autres s-triazines en tant que sources d'azote. Ralstonia basilensis M91-3 fut capable de dénitrification, fait confirmé par l'analyse par chromatographie en phase gazeuse de l'oxyde nitreux dans des conditions de blocage à l'acétylène.Mots clés : biodégradation de l'atrazine, dénitrification, dégradateur d'herbicide, Ralstonia basilensis, dégradation des triazines.[Traduit par la Rédaction]
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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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