A novel actinobacterium, designated strain CFH 30205T, was isolated from a soil sample collected from a karst cave in Luoyang, Henan Province, China. The taxonomic position of the strain was investigated by using a polyphasic approach. Cells of the strain were aerobic, Gram-stain-positive, non-motile and rod-shaped. The strain was found to be catalase- and oxidase-positive. Strain CFH 30205T grew optimally at 28 °C, pH 9.0 and in the presence of up to 1.5 % NaCl (w/v). On the basis of 16S rRNA gene sequence analysis, strain CFH 30205T was most closely related to the type strains of Nocardioides terrigena DS-17T (97.6 % sequence similarity) and Nocardioides sediminis MSL-01T (97.0 %). The DNA G+C content was determined to be 69.9 mol%. ll-2,6-Diaminopimelic acid was the diagnostic diamino acid in the cell-wall peptidoglycan. The whole-cell sugars were mannose, xylose and galactose. The major isoprenoid quinone was MK-8 (H4), and the major fatty acids (>10 %) were iso-C16 : 0 and anteiso-C14 : 0. The polar lipids comprised diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol and an unidentified phospholipid. On the basis of phenotypic, genotypic and phylogenetic data, strain CFH 30205T merits representation of a novel species of the genus Nocardioides, for which the name Nocardioides allogilvus sp. nov. is proposed. The type strain is CFH 30205T (=KCTC 49020T=CGMCC 4.7457T).
Keywords: Nocardioides allogilvus sp. nov.; karst cave; polyphasic taxonomy.