Abstract
Two halophilic archaeal strains, YC21T and YC77, were isolated from an inland salt lake of China. Both have pleomorphic rod-shaped cells that lyse in distilled water, stain Gram-negative and form red-pigmented colonies. They are neutrophilic, require at least 2.1 M NaCl for growth under the optimum growth temperature of 37 °C. The major polar lipids of the two strains were phosphatidylglycerol (PG), phosphatidylglycerol phosphate methyl ester (PGP-Me), phosphatidylglycerol sulfate (PGS), two major glycolipids (GL1 and GL2) chromatographically identical to sulfated mannosyl glucosyl diether (S-DGD-1) and mannosyl glucosyl diether (DGD-1), respectively. Trace amounts of two unidentified lipids (GL0-1 and GL0-2) were also detected. The 16S rRNA gene sequences of the two strains are 99.9 % identical, show 94.0–98.9 % similarity to the closest relative members of Halobellus of the family Halobacteriaceae. The rpoB′ gene similarity between strains YC21T and YC77 is 99.8 % and show 90.3–95.3 % similarity to the closest relative members of Halobellus. The DNA G+C content of strains YC21T and YC77 were 66.1 and 66.2 mol%, respectively. The DNA–DNA hybridization value between strain YC20T and strain YC77 was 89 %, and the two strains showed low DNA–DNA relatedness with Halobellus limi TBN53T, the most related member of Halobellus. The phenotypic, chemotaxonomic and phylogenetic properties suggest that strains YC21T and YC77 represent a novel species of the genus Halobellus, for which the name Halobellus rarus sp. nov. is proposed. The type strain is YC21T (=CGMCC 1.12121T = JCM 18362T).
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This work was supported by the Qinglan project of Jiangsu Province, the opening project of Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin (BRZD1206) and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains YC21T and YC77 are JQ237123 and KF193579, respectively. Those for the rpoB′ gene sequences of strains YC21T and YC77 are KF193580 and KF193581, respectively. Phase-contrast micrographs of strains YC21T and YC77, thin-layer chromatograms of strains YC21T, YC77 and some other haloarchaea, are available as supplementary materials.
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Zhang, WJ., Han, D., Qiu, XX. et al. Halobellus rarus sp. nov., a halophilic archaeon from an inland salt lake of China. Antonie van Leeuwenhoek 104, 377–384 (2013). https://doi.org/10.1007/s10482-013-9960-y
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DOI: https://doi.org/10.1007/s10482-013-9960-y