Halomonas socia sp. nov., isolated from high salt culture of Dunaliella salina
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A moderately halophilic bacteria designed strain NY-011T was isolated from the high salt culture of Dunaliella salina in Chengdu of Sichuan Province, China. The isolate was Gram-negative, nonmotile, rod-shaped and 12.5–21.6 μm in length. Colonies on solid media are circular, wet, smooth and cream. The strain grew optimally at 37 °C, pH 7.0 and in the presence of 8 % NaCl. Acid was produced from glycerol, d-arabinose, glucose, trehalose, inositol, mannose, mannitol, sucrose, maltose and sorbitol. Catalase is produced but not oxidase. The major fatty acids are C18: 1ω7c (37.59 %), C19: 0 cyclo ω8c (18.29 %), C16: 0 (16.05 %) and C6: 0 (12.43 %). The predominant respiratory lipoquinone found in strain NY-011T is ubiquinone with nine isoprene units (Q-9). The genomic DNA G + C content of strain NY-011T was 62.7 mol%. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain NY-011T belonged to the genus Halomonas. The highest levels of 16S rRNA gene sequence similarity were found between the strain NY-011T and H. pantelleriensis (sequence similarity 98.43 %). However, the levels of DNA–DNA relatedness between them were only 23.1 %. In addition, the strain NY-011T had a phenotypic profile that readily distinguished it from H. pantelleriensis. The strain NY-011T therefore represents a new species of the genus Halomonas, for which the name Halomonas socia sp. nov. is proposed, with NY-011T (=CCTCC AB 2011033T = KCTC 23671T) as the type strain.
KeywordsHalomonas Halophilic bacteria Dunaliella salina Taxonomy Hypersaline
The authors are grateful to the College of Life Sciences, Zhejiang University, and Dr. Agata Gambacorta for providing the reference strains. This work was supported by grants from the National Natural Science Foundation of China (Nos.: 30500006, 30970043).
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