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Halolactibacillus alkaliphilus sp. nov., a moderately alkaliphilic and halophilic bacterium isolated from a soda lake in Inner Mongolia, China, and emended description of the genus Halolactibacillus

¹ College of Biological Sciences, Key Laboratory of Agro-Microbial Resource and Application, Ministry of Agriculture, China Agricultural University, Beijing 100193, PR China
² National Research Center for GeoAnalysis, Chinese Academy of Geological Sciences, Beijing 100037, PR China

Correspondence
Hong-Li Yuan
hlyuan{at}cau.edu.cn

A moderately alkaliphilic and halophilic bacterium was isolated from sediment of Xiarinaoer soda lake located in the Inner Mongolia municipality. This bacterium, designated strain H-5^T, was a facultative anaerobe, Gram-positive, rod-shaped and non-motile. Strain H-5^T grew in complex medium with 0.5–30 % (w/v) NaCl and at pH 7.5–13. The cell wall peptidoglycan contained meso-diaminopimelic acid. The major isoprenoid quinones found in this strain were MK-9H₄ and MK-9H₂, and the major cellular fatty acids were C_{16 : 0} and anteiso-C_{13 : 0}. The DNA G+C content of strain H-5^T was 38.3 mol%. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain H-5^T was located in the genus Halolactibacillus. The 16S rRNA gene sequence similarities between strain H-5^T and the type strains of the two recognized species of the genus Halolactibacillus were 98.6 and 98.0 %. The DNA–DNA relatedness values between strain H-5^T and the two type strains were 19 and 5 %. Based on the phenotypic and chemotaxonomic data, the phylogenetic analysis and genomic distinctiveness, strain H-5^T is considered to represent a novel species of the genus Halolactibacillus, for which the name Halolactibacillus alkaliphilus is proposed. The type strain is H-5^T (=CGMCC AS 1.6843^T=NBRC 103919^T).

A maximum-parsimony phylogenetic tree based on 16S rRNA gene sequences is available as a supplementary figure with the online version of this paper.

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