Psychroflexus salarius sp. nov., isolated from Gomso salt pan

Area of Science:

• Microbiology
• Bacteriology
• Taxonomy

Background:

• The Gomso salt pan in Korea is a unique environment for microbial life.
• Taxonomic studies are crucial for understanding microbial diversity and classification.
• The genus Psychroflexus comprises bacteria adapted to specific environmental conditions.

Purpose of the Study:

• To taxonomically characterize a novel bacterial strain, MIC1008(T), isolated from a Korean salt pan.
• To determine the phylogenetic placement of the novel isolate within the genus Psychroflexus.
• To propose a new species name and designation for the characterized strain.

Main Methods:

• Isolation and cultivation of the bacterial strain MIC1008(T).
• Morphological, physiological, and biochemical characterization.
• 16S rRNA gene sequence analysis for phylogenetic identification.
• Analysis of major fatty acids, isoprenoid quinones, and polar lipids.
• Determination of DNA G+C content.

Main Results:

• Strain MIC1008(T) is a Gram-negative, aerobic, non-motile, moderately halophilic rod.
• Optimal growth occurs at 25 °C and pH 6.5–8.5.
• 16S rRNA gene sequence similarity to Psychroflexus halocasei WCC 4520(T) is 95.4%, indicating a new species.
• Major fatty acids include iso-C15:0 and iso-C17:0 3-OH; menaquinone MK-6 is the primary isoprenoid quinone.
• DNA G+C content is 32.9 mol%.

Conclusions:

• Strain MIC1008(T) represents a novel species of the genus Psychroflexus.
• The proposed name for this new species is Psychroflexus salarius sp. nov.
• The type strain is MIC1008(T) (= KACC 17063(T) = DSM 25661(T)).