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Abstract

A haloalkaliphilic archaeon, strain JX313, was isolated from a saline–alkaline soil from Daqing, Heilongjiang Province, China. Its morphological, physiological and biochemical features and 16S rRNA gene sequence were determined. Colonies of the strain were orange–red and cells were non-motile cocci and Gram-stain-variable. The strain required at least 1.7 M NaCl for growth, with optimal growth occurring in 2.0–2.5 M NaCl. Growth was observed at 20–50 °C and pH 8.0–10.5, with optimal growth at 35 °C and pH 10.0. The G+C content of its genomic DNA was 59.3 mol%. Phylogenetic analysis of 16S rRNA gene sequences showed that strain JX313 is associated with the genera and and is most closely related to XH-65 (96.2 % sequence similarity) and FP1 (96.2 %). DNA–DNA hybridization experiments revealed that the relatedness of strain JX313 to type strains of related species of the genus or was less than 50 %. Furthermore, the cellular polar lipids of strain JX313, identified as phosphatidylglycerol, phosphatidylglycerol phosphate methyl ester and mannose-2,6-disulfate (1→2)-glucose glycerol diether (S-DGD), were consistent with the polar lipid characteristics of the genus . Therefore, phylogenetic analysis, phenotypic assessment and chemotaxonomic data showed that JX313 represents a novel species within the genus , for which the name sp. nov. is proposed. The type strain is JX313 (=CGMCC 1.8909 =NBRC 105739).

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2010-10-01
2020-10-01
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