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Microvirga subterranea gen. nov., sp. nov., a moderate thermophile from a deep subsurface Australian thermal aquifer

Microbial Research Discovery Unit, School of Biomolecular and Biomedical Sciences, Faculty of Science, Griffith University, Brisbane, Queensland 4111, Australia

Correspondence
Bharat K. C. Patel
bharat{at}genomes.sci.gu.edu.au

A strictly aerobic bacterium, strain FaiI4^T, was isolated from free-flowing geothermal waters of a bore (bore register no. 3768) tapping the Great Artesian Basin of Australia. The non-sporulating, Gram-negative cells of strain FaiI4^T produced light-pink colonies, were rod-shaped (1x1·5–4 µm) and were motile by a single polar flagellum. Strain FaiI4^T grew optimally at 41 °C at a pH of 7·0 and had an absolute requirement for yeast extract. The strain grew on casein hydrolysate, tryptone, gelatin, xylose and acetate in a medium supplemented with 0·06 or 0·006 % yeast extract. Weak acid production was detected from glucose and arabinose. Catalase was produced. Nitrite was produced from nitrate. Strain FaiI4^T was sensitive to antibiotics that inhibit growth of bacteria. The G+C content was 63·5±0·5 mol%. Strain FaiI4^T was a member of the class ‘Alphaproteobacteria’, phylum Proteobacteria, placed almost equidistantly between Methylobacterium species, Chelatococcus asaccharovorans and Bosea thiooxidans (similarity value of 93 %) as its nearest phylogenetic relatives. Phylogenetic and phenotypic evidence suggest that strain FaiI4^T (=ATCC BAA-295^T =DSM 14364^T) should be placed as the type strain of a species in a newly created genus, for which the name Microvirga subterranea gen. nov., sp. nov. is proposed.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain FaiI4^T is AY078053.

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