1887

Abstract

A strain representing a rapidly growing, Gram-stain-positive, aerobic, rod-shaped, non-motile, non-sporulating and non-pigmented species of the genus Mycobacterium , designated strain S-I-6, was isolated from groundwater at Daejeon in Korea. The strain grew at temperatures between 10 and 37 °C (optimal growth at 25 °C), between pH 4.0 and 9.0 (optimal growth at pH 7.0) and at salinities of 0–5 % (w/v) NaCl, growing optimally with 2 % (w/v) NaCl. Phylogenetic analyses based on multilocus sequence analysis of the 16S rRNAgene, hsp65, rpoB and the 16S–23S internal transcribed spacer indicated that strain S-I-6 belonged to the rapidly growing mycobacteria, being most closely related to Mycobacterium sphagni . On the basis of polyphasic taxonomic analysis, the bacterial strain was distinguished from its phylogenetic neighbours by chemotaxonomic properties and other biochemical characteristics. DNA–DNA relatedness among strain S-I-6 and the closest phylogenetic neighbour strongly support the proposal that this strain represents a novel species within the genus Mycobacterium , for which the name Mycobacterium aquiterrae sp. nov. is proposed. The type strain is S-I-6 (=KACC 17600=NBRC 109805=NCAIM B 02535).

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2017-09-18
2019-10-16
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