Lysobacter agri sp. nov., a bacterium isolated from soil

Area of Science:

• Microbiology
• Bacteriology
• Taxonomy

Background:

• The genus Lysobacter comprises aerobic, Gram-negative bacteria known for diverse metabolic capabilities.
• Soil environments are rich reservoirs of microbial diversity, including potentially novel bacterial species.

Purpose of the Study:

• To isolate and characterize a novel bacterial strain from South Korean field soil.
• To determine the taxonomic position of the novel isolate within the genus Lysobacter.

Main Methods:

• Isolation and cultivation of bacteria from soil samples.
• Morphological, physiological, and biochemical characterization.
• Phylogenetic analysis based on 16S rRNA gene sequences.
• DNA-DNA hybridization for relatedness studies.
• Chemotaxonomic analyses (G+C content, polar lipids, fatty acids, respiratory quinones).

Main Results:

• A novel Gram-negative, aerobic, rod-shaped, and motile bacterial strain, THG-SKA3(T), was isolated.
• Phylogenetic analysis placed strain THG-SKA3(T) within the genus Lysobacter, with closest relatives including L. niastensis and L. enzymogenes.
• DNA-DNA relatedness values were below 25.0%, supporting its status as a distinct species.
• Chemotaxonomic data (major polar lipids, ubiquinone-8, specific fatty acids) were consistent with the genus Lysobacter.

Conclusions:

• Strain THG-SKA3(T) represents a novel species of the genus Lysobacter.
• The proposed name for this new species is Lysobacter agri sp. nov.
• This finding expands the known diversity within the Lysobacter genus.