An alkaliphilic actinobacterium, designated strain CAAS 252, was isolated from the black liquor treatment system of a cotton pulp mill in Wuhan, China. Cells of strain CAAS 252 were Gram-positive, non-motile, non-endospore-forming, short rod-shaped, and grew optimally at 42 °C and pH 9–10 in the presence of 3 % (w/v) NaCl. Strain CAAS 252 contained MK-7, MK-8 and MK-9 as the major menaquinones and anteiso-C, anteiso-C and C as the predominant cellular fatty acids and had a peptidoglycan type of A4, Lys–Gly--Asp. The DNA G+C content was 60.2 mol%. Based on analysis of 16S rRNA gene sequences (94.7–96.8 % similarity), DNA–DNA hybridization (<70 % relatedness) and chemotaxonomic characteristics, strain CAAS 252 belonged to the genus , but differed from all recognized species. Therefore, it is proposed that strain CAAS 252 represents a novel species of the genus , for which the name sp. nov. is proposed. The type strain is CAAS 252 (=CCTCC AB 207011=DSM 19423).


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