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Microbacterium indicum sp. nov., isolated from a deep-sea sediment sample from the Chagos Trench, Indian Ocean

¹ Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
² National Institute of Oceanography, Dona Paula, Goa 403 004, India

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

Two bacterial strains, BBH6^T and BBH9, were isolated from a deep-sea sediment sample collected from the Chagos Trench, Indian Ocean, at a depth of 5904 m. The two strains were closely related in their 16S rRNA gene sequences (99.7 %), belonged to one genomic species and were virtually identical at the phenotypic level. Microbacterium barkeri DSM 20145^T was the nearest phylogenetic neighbour to the new isolates, with 16S rRNA gene sequence similarity levels of 97.2–97.4 %. The new isolates exhibited levels of DNA–DNA relatedness of 32–34 % to M. barkeri and differed from it in a number of phenotypic characteristics. Therefore, it is suggested that strains BBH6^T and BBH9 represent a novel species of the genus Microbacterium, for which the name Microbacterium indicum sp. nov. is proposed. The type strain is BBH6^T (=LMG 23459^T=IAM 15355^T).

Tables comparing the cellular fatty acid compositions and giving levels of DNA–DNA relatedness among strains BBH6^T and BBH9 and the type strains of Microbacterium barkeri and Microbacterium gubbeenense are available with the online version of this paper.

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