Patulibacter brassicae sp. nov., isolated from rhizosphere soil of Chinese cabbage (Brassica campestris)

A novel actinobacterial strain, designated SDT, was isolated from rhizosphere soil of Chinese cabbage in Shandong province, China. The cells were aerobic, Gram-staining-positive, oxidase- and catalase-positive, short rods and formed white colonies on trypticase soy agar. The cell-wall peptidoglycan contained meso-diaminopimelic acid as the diagnostic diamino acid and alanine, glutamic acid and leucine. Diphosphatidylglycerol was the predominant polar lipid. The predominant cellular fatty acid was C18 : 1 ω9c; minor components were anteiso-C15 : 0 and anteiso-C17 : 0. The only isoprenoid quinone was demethylmenaquinone 7 (DMK-7), and the DNA G+C content was 72.7 mol%. Based on the full-length 16S rRNA gene sequence analysis, the closest phylogenetic neighbours of strain SDT were Patulibacter medicamentivorans DSM 25962T (96.9 %), Patulibacter minatonensis DSM 18081T (96.7 %), Patulibacter americanus DSM 16676T (96.2 %) and Patulibacter ginsengiterrae DSM 25990T (95.9 %). Considering combined phenotypic and genotypic characteristics, it is proposed that strain SDT represents a novel species of the genus Patulibacter , for which the name Patulibacter brassicae sp. nov. is proposed. The type strain is SDT (=CICC 24108T=KCTC 39817T).