Pedobacter insulae sp. nov., isolated from soil.

Area of Science:

• Microbiology
• Bacterial Taxonomy
• Phylogenetics

Background:

• Soil ecosystems harbor diverse microbial communities.
• Accurate bacterial classification is crucial for understanding microbial roles and evolution.
• The genus Pedobacter, within the family Sphingobacteriaceae, comprises several known species.

Purpose of the Study:

• To characterize a novel bacterial isolate from a Korean soil sample.
• To determine the taxonomic placement of the isolate using polyphasic methods.
• To propose a new species designation for the distinct isolate.

Main Methods:

• Isolation and cultivation of strain DS-139(T) from soil.
• Physicochemical characterization including optimal growth conditions and NaCl tolerance.
• Analysis of cellular fatty acids and menaquinone composition.
• Phylogenetic analysis based on 16S rRNA gene sequencing.

Main Results:

• Strain DS-139(T) is a Gram-negative, non-motile rod.
• Optimal growth observed at 25°C and pH 6.5-7.5 with 0-0.5% NaCl.
• Predominant menaquinone is MK-7; major fatty acids include iso-C15:0, C16:1ω7c, iso-C15:0 2-OH, and iso-C17:0 3-OH.
• 16S rRNA gene sequence analysis places the strain within the genus Pedobacter, with 93.9-96.7% similarity to known species.
• Phenotypic and phylogenetic data distinguish it from recognized Pedobacter species.

Conclusions:

• Strain DS-139(T) represents a novel species of the genus Pedobacter.
• The proposed name for this new species is Pedobacter insulae sp. nov.
• The type strain is DS-139(T) (=KCTC 12820(T) =DSM 18684(T)).