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Abstract

The taxonomic position of a Gram-stain negative, non-violaceinpigmented bacterium isolated from an insecticide-contaminated site was characterized by a polyphasic approach. The bacterium was able to grow on three different halogenated compounds namely 1-hlorobutane, 1-hloropropane and 1,2-ichloroethane. As a critical step in the degradation of these haloalkanes, stoichiometric amounts of dechlorination were estimated. Based on selective enrichment method for three months, using a highly contaminated mixed chemical soil, a bacterium was obtained and designated as IITR-71. Its versatility and novelty led us to further characterize it by polyphasic taxonomy. The 16S rRNA gene sequence (1446 bases) comparison showed highest similarity with those of members of the genus with the most closely related species to strain IITR-71 being (99.3 %) followed by (98.6 %) and (97.1 %). The major ubiquinone was Q-8. Predominant polar lipids are phosphatidylethanolamine (PE), phosphatidylglycerol (PG) and diphosphatidylglycerol (DPG). The DNA G+C content of IITR-71 was estimated to be 61.2 mol%. The genotypic and phenotypic distinctiveness of IITR-71 and its phylogenetic relationships indicate that IITR-71 represents a novel species, for which the name sp. nov. is proposed. The type strain is IITR-71 (=MTCC 11059=JCM 30068=KCTC 52433).

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2016-12-01
2020-01-29
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