Stakelama sediminis sp. nov., isolated from tidal flat sediment

Area of Science:

• Microbiology
• Bacteriology
• Taxonomy

Background:

• Tidal flat environments harbor diverse microbial communities.
• Accurate bacterial classification is crucial for understanding ecological roles and potential applications.
• The genus Stakelama currently contains only one recognized species.

Purpose of the Study:

• To taxonomically characterize a novel bacterial isolate, strain CJ70(T), from a Korean tidal flat.
• To determine the phylogenetic and chemotaxonomic properties of strain CJ70(T).
• To propose a new species designation for strain CJ70(T) within the genus Stakelama.

Main Methods:

• Isolation and cultivation of bacteria from tidal flat sediment.
• Polyphasic taxonomic analysis, including Gram staining, morphology, and motility tests.
• Phylogenetic analysis based on 16S rRNA gene sequencing.
• Chemotaxonomic analyses: cellular fatty acid composition and major isoprenoid quinone determination.
• Genomic DNA G+C content determination.

Main Results:

• Strain CJ70(T) is a Gram-negative, strictly aerobic, yellow-pigmented, rod-shaped, non-motile bacterium.
• 16S rRNA gene sequence analysis showed highest similarity (95.7%) to Stakelama pacifica JLT832(T), forming a distinct lineage.
• Predominant fatty acids were C18:1ω7c (60.0%), C16:0 (21.2%), and C14:0 2-OH (5.8%). Ubiquinone-10 was the major isoprenoid quinone.
• The genomic DNA G+C content was 61.4 mol%.

Conclusions:

• Strain CJ70(T) represents a novel species of the genus Stakelama.
• The proposed name for this new species is Stakelama sediminis sp. nov.
• This finding expands the known diversity within the Stakelama genus and highlights the microbial richness of tidal flat ecosystems.