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Abstract

A facultatively anaerobic, alkaliphilic, spore-forming, Gram-positive-staining rod, designated Y1, was isolated under strictly anaerobic conditions from sediment of a soda lake in Jilin province, China. The strain was not dependent on Na but was highly halotolerant and grew optimally in medium JY with 0.5 M Na (0.06 M NaHCO and 0.44 M NaCl). The optimum pH for growth was 9.0, with a range of pH 7.5–10.5. No growth occurred at pH 7.0 or 11.0. The strain was mesophilic, with a temperature range of 15–45 °C and optimum growth at 32 °C. Strain Y1 was able to use certain mono- and oligosaccharides. Soluble starch and casein were hydrolysed. The methyl red test, Voges–Proskauer test and tests for catalase and oxidase activities were negative. The predominant fatty acids were anteiso-C and iso-C. Comparative 16S rRNA gene sequence analysis revealed 93.4–96.8 % sequence similarity to members of the genus . The DNA G+C content was 37.7 mol% ( method). The DNA–DNA relatedness of strain Y1 with respect to DSM 13870 and DSM 21624 was 48 and 37 %, respectively. On the basis of its phylogenetic position and the DNA–DNA relatedness data as well as its physiological and biochemical properties, strain Y1 represents a novel species of the genus , for which the name sp. nov. is proposed. The type strain is Y1 (=CGMCC 1.5123 =JCM 16149).

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2010-11-01
2019-12-05
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Transmission electron micrograph of cells of strain Y1 , showing a longitudinal ultrathin section of a cell forming a spore in the stationary phase of growth. Bar, 0.5 µm.

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Phylogenetic tree, based on 16S rRNA gene sequences, showing the relationships of strain Y1 and related taxa, generated using the maximum-parsimony method with the MEGA4 program package. [ PDF] (39 KB)

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