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Aquimonas voraii gen. nov., sp. nov., a novel gammaproteobacterium isolated from a warm spring of Assam, India

¹ Microbial Type Culture Collection & Gene Bank (MTCC), Institute of Microbial Technology, Sector 39A, Chandigarh – 160 036, India
² Biotechnology Division, Regional Research Laboratory, Jorhat – 785 006, Assam, India

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

A bacterial strain designated GPTSA 20^T, which was isolated from a warm spring in Assam, India, was characterized by using a polyphasic approach. The cells were Gram-negative, aerobic rods, which could not utilize or produce acid from most of the carbohydrates tested. The predominant fatty acids were C_{15 : 0} iso (25·04 %), C_{17 : 1} iso 9c (19·28 %), C_{16 : 0} iso (17·73 %) and C_{11 : 0} iso 3-OH (9·34 %). The G+C content was 75 mol%. From 16S rRNA gene sequence analysis (1433 nucleotides, continuous stretch), it was confirmed that strain GPTSA 20^T belonged to the class ‘Gammaproteobacteria’. The closest 16S rRNA gene sequence similarity found (98·2 %) was with an uncultured bacterium clone, NB-03 (accession no. AB117707), from an autotrophic nitrifying biofilm. Among culturable bacteria, the closest sequence similarities were with Fulvimonas soli (93·0 %), Silanimonas lenta (92·8 %), Thermomonas hydrothermalis (92·4 %), Frateuria aurantia (91·9 %), Rhodanobacter lindaniclasticus (91·9 %), Thermomonas haemolytica (91·9 %) and Pseudoxanthomonas taiwanensis (91·8 %); similarities of less than 91·8 % were obtained with other members of the class ‘Gammaproteobacteria’. From the biochemical, physiological, chemotaxonomic and phylogenetic analysis, it was clear that strain GPTSA 20^T was quite different from members of known genera of the class ‘Gammaproteobacteria’. Therefore, it is proposed that strain GPTSA 20^T represents a novel species within a new genus, with the name Aquimonas voraii gen. nov., sp. nov. The type strain is GPTSA 20^T (=MTCC 6713^T=JCM 12896^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Aquimonas voraii GPTSA 20^T is AY544768.

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