Pseudomonas oceani sp. nov., isolated from deep seawater

Area of Science:

• Microbiology
• Marine Biology
• Genomics

Background:

• Deep-sea environments harbor unique microbial life.
• The genus Pseudomonas is known for its metabolic versatility and presence in diverse habitats.

Purpose of the Study:

• To identify and characterize a novel bacterial species from the deep seawater of the Okinawa Trough.
• To determine the phylogenetic and phenotypic distinctiveness of the isolated strain.

Main Methods:

• Isolation and cultivation of bacteria from deep-sea samples.
• Phylogenetic analysis using 16S rRNA, gyrB, and rpoD gene sequences.
• Determination of cellular fatty acid composition and polar lipid profiles.
• Measurement of genomic DNA G+C content.

Main Results:

• A novel Gram-negative, aerobic, motile, rod-shaped bacterium, strain KX 20T, was isolated.
• Phylogenetic analyses indicated its placement within the genus Pseudomonas, with highest 16S rRNA gene identity to P. aestusnigri.
• Distinct genotypic and phenotypic characteristics supported its classification as a new species, Pseudomonas oceani sp. nov.

Conclusions:

• Strain KX 20T represents a new species, Pseudomonas oceani, within the genus Pseudomonas.
• This discovery contributes to the knowledge of microbial diversity in deep-ocean ecosystems.
• The characterized strain provides a new model for studying adaptations to extreme marine environments.