Abstract
An actinomycete strain, designated YIM 98757T, was isolated from the hypersaline sediment of Aiding Lake in Xinjiang province, north-west China. The strain grew well on most media tested and no diffusible pigment was produced. The substrate mycelium was well developed and fragmented. No spores were formed. The whole-cell hydrolysates contained meso-diaminopimelic acid as the cell-wall diamino acid. Xylose, galactose, ribose were the major whole-cell sugars. The phospholipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylinositol, phosphatidylinositol mannosides and an unknown phospholipid. The predominant menaquinone was MK-8(H4). The major fatty acid was iso-C16:0. The DNA G + C content was 69.1mol%. Phylogenetic analysis indicated that the isolate belongs to the genus Haloechinothrix. However, it differed from its closest relative, H. alba YIM 98757T in many phenotypic and chemotaxonomic characteristics. Moreover, the DNA-DNA and ANI relatedness values between the novel isolate and H. alba YIM 93221T were 53.3% and 92.5%, respectively. Based on comparative analysis of polyphasic taxonomic data, strain YIM 98757T represents a novel species of the genus Haloechinothrix, for which the name Haloechinothrix aidingensis sp. nov. is proposed. The type strain is YIM 98757T (= CGMCC 4.7627T = CCTCC AA 2020012).
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