Nocardioides daejeonensis sp. nov., a denitrifying bacterium isolated from sludge in a sewage-disposal plant
2012
Strain MJ31T, a Gram-reaction-positive, aerobic, rod-shaped, non-motile bacterium, was isolated from a sludge sample collected at the Daejeon sewage-disposal plant, in South Korea, and characterized in order to determine its taxonomic position. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain MJ31T belonged to the genus
Nocardioides
, appearing most closely related to
Nocardioides dubius
KSL-104T (98.6 % sequence similarity),
Nocardioides jensenii
DSM 20641T (97.6 %),
Nocardioides daedukensis
MDN22T (97.2 %) and
Nocardioides mesophilus
MSL-22T (97.0 %). The chemotaxonomic properties of strain MJ31T were consistent with those of the genus
Nocardioides
: MK-8(H4) was the predominant menaquinone, iso-C16 : 0, iso-C17 : 0 and C18 : 1ω9c were the predominant cellular fatty acids, and the cell-wall peptidoglycan was based on ll-2,6-diaminopimelic acid. The genomic DNA G+C content of strain MJ31T was 71.2 mol%. Some differential phenotypic properties and low DNA–DNA relatedness values (<28 %) with the type strains of closely related species indicated that strain MJ31T represents a novel species, for which the name Nocardioides daejeonensis sp. nov. is proposed. The type strain is MJ31T ( = KCTC 19772T = JCM 16922T).
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