Nocardioides guangzhouensis sp. nov., an actinobacterium isolated from soil.

Abstract

A Gram-positive, aerobic, non-spore-forming, non-pigmented and non-motile actinobacterial strain was isolated from a soil sample collected in Guangzhou, China. Phylogenetic analysis based on the 16S rRNA gene sequence revealed that strain 130T is most closely related to the type strain Nocardioides iriomotensis NBRC 105384T, with a sequence similarity of 97.69 %. The isolate was distinguished from this phylogenetically related type strain by DNA-DNA hybridization (33.3 %), digital DNA-DNA hybridization (21.2 %), average nucleotide identity (75.7 %) and by a range of physiological and biochemical characteristics. Strain 130T contained MK-8(H4) and MK-7 as the major menaquinones, diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol and phosphatidylinositol as the main polar lipids, and iso-C16 : 0, C17 : 1ω8c, anteiso-C17 : 0, C18 : 1ω9c, C17 : 0 and iso-C14 : 0 as the major cellular fatty acids. The novel strain grew at 20-36 °C, at pH 6.0-8.0 and in the presence of 0-6 % (w/v) NaCl. The genomic DNA G+C content was 72.9 mol%. The genome contained 4817 putative protein-coding sequences, and 45 tRNA and three rRNA genes. Phylogenomic analysis confirmed that strain 130T belongs to the genus Nocardioides and distinguished it from recognized Nocardioides species with available genomes. Based on these polyphasic taxonomic data, strain 130T represents a new species of the genus Nocardioides, for which the name Nocardioidesguangzhouensis sp. nov. is proposed. The type strain is 130T (=CICC 24668T=JCM 33269T).