Nocardioides insulae sp. nov., isolated from soil

Area of Science:

• Microbiology
• Bacterial Taxonomy
• Phylogenetics

Background:

• The genus Nocardioides comprises Gram-positive bacteria with diverse ecological roles.
• Accurate taxonomic classification is crucial for understanding microbial diversity and function.

Purpose of the Study:

• To taxonomically characterize a novel bacterial isolate, strain DS-51(T), from Dokdo soil.
• To determine the phylogenetic and chemotaxonomic relationship of strain DS-51(T) to existing Nocardioides species.

Main Methods:

• Polyphasic taxonomic approach, including 16S rRNA gene sequencing.
• Chemotaxonomic analyses (cell-wall peptidoglycan, menaquinone, fatty acids).
• Phenotypic characterization and DNA G+C content determination.

Main Results:

• Strain DS-51(T) exhibited optimal growth at pH 8.0 and 30°C without NaCl.
• Phylogenetic analysis placed strain DS-51(T) within the Nocardioides genus, with 92.5–95.1% 16S rRNA gene sequence similarity to known species.
• Chemotaxonomic and phenotypic data were consistent with the genus Nocardioides but distinct from other species.

Conclusions:

• Strain DS-51(T) represents a novel species within the genus Nocardioides.
• The proposed name for this new species is Nocardioides insulae sp. nov.
• The type strain is DS-51(T) (=KCTC 19180(T)=DSM 17944(T)).