sp. nov., an alkaliphilic iron- and sulfur-reducing bacterium isolated from a steppe soda lake Free

Abstract

A novel alkaliphilic spore-forming bacterium was isolated from the benthic sediments of the highly mineralized steppe Lake Khilganta (Transbaikal Region, Russia). Cells of the strain, designated Х-07-2, were straight to slightly curved rods, Gram-stain-positive and motile. Strain Х-07-2 grew in the pH range from 7.0 to 10.7 (optimum pH 9.6–10.3). Growth was observed at 25–47 °C (optimum 30 °C) and at an NaCl concentration from 5 to 150 g l with an optimum at 40 g l. Strain Х-07-2 was a chemo-organoheterotroph able to reduce amorphous ferric hydroxide, Fe(III) citrate and elemental sulfur in the presence of yeast extract as the electron donor. It used tryptone, peptone and trypticase with Fe(III) citrate as the electron acceptor. The predominant fatty acids in cell walls were Cω8, iso-C, C 3-OH and C. The DNA G+C content was 32.6 mol%. 16S rRNA gene sequence analysis revealed that strain Х-07-2 was related most closely to members of the genus within the family . The closest relative was Z-7036 (96.4 % similarity). On the basis of the genotypic, chemotaxonomic and phenotypic data, strain Х-07-2 represents a novel species in the genus , for which the name sp. nov. is proposed. The type strain is Х-07-2 (=VKM В-2746=DSM 26418).

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2017-06-01
2024-03-29
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