Bacillus dafuensis sp. Nov., Isolated from a Forest Soil in China.

Abstract

A Gram-staining-positive, motile, rod-shaped, aerobic bacterial strain FJAT-25496T was isolated from a forest soil sample collected from Dafu County, Chengdu City, Sichuan Province, China. Strain FJAT-25496T grew at 15-50°C (optimum 35°C), pH 6.0-10.0 (optimum 8.0), and NaCl tolerance of 0-4.0% (w/v) (optimum 0%). The strain contained iso-C15:0 and anteiso-C15:0 as the predominant cellular fatty acids as well as MK-7 as the only menaquinone. The major polar lipids were diphosphatidylglycerol (DPG), phosphatidylethanolamine (PE), and phosphatidyl glycerol (PG). Phylogenetic analyses based on 16S rRNA gene sequences showed that strain FJAT-25496T was a member of the genus Bacillus, and most closely related to Bacillus solani FJAT-18043T (97.8%), Bacillus praedii FJAT-25547T (97.8%), Bacillus depressus BZ1T (97.7%), Bacillus oceanisediminis H2T (97.7%), and Bacillus ciccensis 5L6T (97.6%). Based on complete genome comparisons between strain FJAT-25496T and the type strains of its closely related species, the average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values were 73.4-76.3% and 21.7-23.2%, respectively. The genomic DNA G + C content of strain FJAT-25496T was 36.9%. On the basis of phenotypic, phylogenetic, chemotaxonomic, and genomic features, strain FJAT-25496T is considered to represent a novel species of the genus Bacillus, for which the name Bacillus dafuensis sp. nov. is proposed. The type strain is FJAT-25496T (= CCTCC AB 2019182T = KCTC 43120T).