Spirosoma areae sp. nov., Isolated from Soil

Area of Science:

• Microbiology
• Bacterial Taxonomy
• Environmental Microbiology

Background:

• Soil ecosystems harbor diverse microbial communities.
• Accurate bacterial classification is crucial for understanding ecological roles and potential applications.
• The genus Spirosoma comprises Gram-negative bacteria with various environmental origins.

Purpose of the Study:

• To isolate and characterize a novel bacterial strain from a soil sample.
• To determine the taxonomic placement of the novel strain using polyphasic characterization.
• To propose a new species within the genus Spirosoma.

Main Methods:

• Isolation and cultivation of strain Arct 1-12^T on R2A agar.
• Determination of physiological and biochemical characteristics, including growth conditions (temperature, NaCl, pH).
• Phylogenetic analysis based on 16S rRNA gene sequencing and chemotaxonomic analyses (fatty acids, menaquinone, polar lipids).

Main Results:

• Strain Arct 1-12^T is a yellow-colored, Gram-negative bacterium.
• Optimal growth occurred at 25°C, pH 7, and without NaCl, with tolerance up to 1% NaCl.
• 16S rRNA gene sequence analysis showed moderate relatedness to existing Spirosoma species, with DNA G+C content of 52.3 mol%.
• Chemotaxonomic data included MK-7 as the predominant menaquinone and specific major fatty acids.

Conclusions:

• Strain Arct 1-12^T represents a distinct lineage within the genus Spirosoma.
• Based on polyphasic evidence, the strain is classified as the type strain of a novel species, Spirosoma areae sp. nov.
• This finding expands the known diversity of the genus Spirosoma and contributes to soil bacterial taxonomy.