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Aeromonas sharmana sp. nov., isolated from a warm spring

Microbial Type Culture Collection and Gene Bank (MTCC), Institute of Microbial Technology, Sector 39A, Chandigarh 160 036, India

Correspondence
T. Chakrabarti
tapan{at}imtech.res.in

A Gram-negative, facultatively anaerobic bacterial strain designated GPTSA-6^T was isolated from a water sample collected from a warm spring in Assam, India. Preliminary analysis of the 16S rRNA gene sequence of this isolate revealed its affiliation to the family Aeromonadaceae. Detailed characterization using a polyphasic approach indicated that strain GPTSA-6^T is most closely related to Aeromonas sobria but differs significantly from existing members of the genus Aeromonas. Analysis of the almost-complete (1430 nt) 16S rRNA gene sequence of this strain revealed that its closest relative (99.23 % similarity) is an uncultured bacterial clone, A-8, isolated from an algal bloom. Of the taxa with validly published names, Aeromonas sobria ATCC 43979^T showed the highest level of sequence similarity (95.13 %) with respect to strain GPTSA-6^T, followed by Aeromonas molluscorum 848T^T and Aeromonas popoffii LMG 17541^T (95.04 % similarity in both cases). On the basis of the phenotypic, chemotaxonomic and phylogenetic data, it can be concluded that strain GPTSA-6^T represents a novel species of the genus Aeromonas, for which the name Aeromonas sharmana sp. nov. is proposed. The type strain is GPTSA-6^T (=MTCC 7090^T=DSM 17445^T).

A transmission electron micrograph of a cell of strain GPTSA-6^T is available as a supplementary figure in IJSEM Online.

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