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Oceanisphaera psychrotolerans sp. nov., isolated from coastal sediment samples.

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A novel bacterium, Oceanisphaera psychrotolerans, was discovered in China's Bohai Sea. This psychrotolerant species expands the known diversity within the Oceanisphaera genus.

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Area of Science:

  • Microbiology
  • Marine Biology
  • Bacterial Taxonomy

Background:

  • Coastal sediments are rich microbial habitats.
  • The genus Oceanisphaera comprises marine bacteria with diverse ecological roles.
  • Characterization of novel marine microorganisms is crucial for understanding biodiversity.

Purpose of the Study:

  • To isolate and characterize a novel bacterium from coastal sediments of the Bohai Sea.
  • To determine the phylogenetic and taxonomic position of the novel isolate.
  • To propose a new species within the genus Oceanisphaera.

Main Methods:

  • Isolation and cultivation of bacteria from marine sediment samples.
  • Morphological, physiological, and biochemical characterization.
  • 16S rRNA gene sequencing and phylogenetic analysis.
  • DNA-DNA hybridization for taxonomic delineation.

Main Results:

  • A novel aerobic, Gram-staining-negative bacterium, strain LAM-WHM-ZC(T), was isolated.
  • The strain exhibited psychrotolerant characteristics, growing between 4-40 °C.
  • Phylogenetic analysis based on 16S rRNA gene sequences placed the isolate within the genus Oceanisphaera.
  • DNA-DNA hybridization values confirmed its distinction from related species.
  • The DNA G+C content was determined to be 59.3 mol%.

Conclusions:

  • Strain LAM-WHM-ZC(T) represents a novel species of the genus Oceanisphaera.
  • The proposed name for the novel species is Oceanisphaera psychrotolerans sp. nov.
  • This discovery contributes to the understanding of microbial diversity in marine environments.