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Exiguobacterium indicum sp. nov., a psychrophilic bacterium from the Hamta glacier of the Himalayan mountain ranges of India

Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India

Correspondence
S. Shivaji
shivas{at}ccmb.res.in

Strain HHS 31^T, a Gram-positive, motile, rod-shaped, non-spore-forming, alkaliphilic bacterium, was isolated from the melt water of a glacier. Phenotypic and chemotaxonomic characteristics indicate that strain HHS 31^T is related to species of the genus Exiguobacterium. The 16S rRNA gene sequence similarities between HHS 31^T and strains of known species confirm that it is closely related to members of the genus Exiguobacterium (93–99 %) and that it exhibits >97 % similarity with Exiguobacterium acetylicum DSM 20416^T (98.9 %), Exiguobacterium antarcticum DSM 14480^T (98.0 %), Exiguobacterium oxidotolerans JCM 12280^T (97.9 %) and Exiguobacterium undae DSM 14481^T (97.4 %). Phylogenetic analysis based on the 16S rRNA gene sequence further confirms the affiliation of HHS 31^T with the genus Exiguobacterium. However, the levels of DNA–DNA relatedness between HHS 31^T and E. oxidotolerans JCM 12280^T, E. acetylicum DSM 20416^T, E. undae DSM 14481^T and E. antarcticum DSM 14480^T are 50, 63, 67 and 28 %, respectively. Strain HHS 31^T also differs from these four closely related species in terms of a number of phenotypic traits. The phenotypic, chemotaxonomic and phylogenetic data suggest that HHS 31^T merits the status of a novel species, for which the name Exiguobacterium indicum sp. nov. is proposed. The type strain is HHS 31^T (=LMG 23471^T=IAM 15368^T).

Strain HHS 31^T and various Exiguobacterium species are compared in a table of fatty acid compositions and a neighbour-joining phylogenetic tree available as supplementary material in IJSEM Online.

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