Abstract
A non-motile, spherical or oval extremely halophilic archaeon, strain Y69T, was isolated from a brine of the Yunnan salt mine, China. Colonies on JCM 168 agar plate were round (1–2 mm in diameter), moist, and orange-pigmented. Phylogenetic analysis of the almost-complete 16S rRNA gene sequence showed that the isolate belonged to the species of the genus Halorubrum, with a close relationship to Halorubrum aidingense 31-hongT (98.5%), Halorubrum lacusprofundi ATCC 49239T (98.2%), and Halorubrum kocurii BG-1T (98.0%). The major polar lipids of strain Y69T were phosphatidylglycerol phosphate methyl ester, phosphatidylglycerol sulfate and a sulfated diglycosyl diether. Strain Y69T grew in 15–30% (w/v) NaCl. The temperature and pH ranges for growth were 25–50 °C and 6.5–9.0, respectively. Optimal growth occurred at 20% (w/v) NaCl, 42 °C, and pH 8.0. Mg2+ was required for growth. The DNA G+C content was determined to be 65.1 mol% by the thermal denaturation method. DNA–DNA hybridization values between strain Y69T and the closely related species were lower than 70%. Based on the data presented in this study, strain Y69T represents a novel species for which the name Halorubrum salsamenti sp. nov. is proposed. The type of the strain is Y69T (=CGMCC 1.15455T = JCM 31270T).
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Acknowledgements
We thank Prof. Dr. Zhu L. Yang from the Kunming Institute of Botany, Chinese Academy of Sciences, for the help in sample collection, and Prof. Dr. Hua Xiang and Mr. Hong-Can Liu from the Institute of Microbiology, Chinese Academy of Sciences, for good suggestions and doing the DNA-DNA hybridization. This work was supported by Grants from the National Natural Science Foundation of China (31460003), the Anhui Provincial Key Lab of the Conservation, and Exploitation of Biological Resources (591601), the Anhui Provincial Natural Science Research Project (KJ2017A318), and the Education Department of Anhui province (gxyqZD2017011).
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The GenBank/EMBL/DDBJ accession numbers of the 16S rRNA gene, rpoB′, and ef-2 sequences of strain Y69T are KX376706, KX595317, and KX595312, respectively. Three supplementary figures for cell morphology, thin-layer chromatogram of polar lipids, and Neighbor-Joining phylogenetic tree of 16S rRNA gene, rpoB′, and ef-2 genes are available with the online supplementary materials.
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Chen, S., He, J., Zhang, J. et al. Halorubrum salsamenti sp. nov., a Novel Halophilic Archaeon Isolated from a Brine of Salt Mine. Curr Microbiol 74, 1358–1364 (2017). https://doi.org/10.1007/s00284-017-1325-8
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DOI: https://doi.org/10.1007/s00284-017-1325-8