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Int J Syst Evol Microbiol 57 (2007), 1024-1027; DOI  10.1099/ijs.0.64899-0
© 2007 International Union of Microbiological Societies

Halovivax ruber sp. nov., an extremely halophilic archaeon isolated from Lake Xilinhot, Inner Mongolia, China

A. M. Castillo1, M. C. Gutiérrez1, M. Kamekura2, Y. Xue3, Y. Ma3, D. A. Cowan4, B. E. Jones5, W. D. Grant6 and A. Ventosa1

1 Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
2 Noda Institute for Scientific Research, 399 Noda, Noda-shi, Chiba-ken 278-0037, Japan
3 State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China
4 Department of Biotechnology, University of the Western Cape, Bellville 7535, Cape Town, South Africa
5 Genencor International BV, Archimedesweg 30, 2333 CN Leiden, The Netherlands
6 Department of Infection, Immunity and Inflammation, University of Leicester, Leicester LE1 9HN, UK

Correspondence
A. Ventosa
ventosa{at}us.es

A Gram-negative, pleomorphic, extremely halophilic archaeon, designated strain XH-70T, was isolated from the saline Lake Xilinhot, in Inner Mongolia, China. It formed small (0.9–1.5 mm), red-pigmented, elevated colonies on agar medium. The strain required at least 2.5 M NaCl and 5 mM Mg2+ for growth. The 16S rRNA gene sequence analysis indicated that strain XH-70T belongs to the family Halobacteriaceae, showing 99.5 % similarity to the type strain of Halovivax asiaticus and 94.7 and 94.6 % similarity, respectively, to the type strains of Natronococcus amylolyticus and Natronococcus occultus. Polar lipid analysis supported the placement of strain XH-70T in the genus Halovivax. DNA–DNA hybridization studies (32 % with Halovivax asiaticus CGMCC 1.4248T), as well as biochemical and physiological characterization, allowed strain XH-70T to be differentiated from Halovivax asiaticus. A novel species, Halovivax ruber sp. nov., is therefore proposed to accommodate this strain. The type strain is XH-70T (=CGMCC 1.6204T=DSM 18193T=JCM 13892T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain XH-70T is AM269467.

Results of TLC of polar lipids of strain XH-70T and related strains are available as supplementary material in IJSEM Online.






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