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Nocardioides marinus sp. nov.

Dong Han Choi1, Hye Min Kim2, Jae-Hoon Noh1

  • 1Marine Environmental Research Department, Korea Ocean Research and Development Institute, Ansan 426-744, Republic of Korea.

International Journal of Systematic and Evolutionary Microbiology
|March 30, 2007
PubMed
Summary
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A novel slightly halophilic bacterium, Nocardioides marinus sp. nov., was isolated from Korean seawater. Phylogenetic and phenotypic analyses confirm it represents a new species within the Nocardioides genus.

Area of Science:

  • Microbiology
  • Bacteriology
  • Taxonomy

Background:

  • The genus Nocardioides comprises Gram-positive bacteria with diverse environmental distributions.
  • Characterization of novel bacterial species is crucial for understanding microbial diversity and ecological roles.

Purpose of the Study:

  • To isolate and characterize a novel bacterial strain from seawater.
  • To determine the phylogenetic and phenotypic properties of the isolate.
  • To formally propose a new species within the Nocardioides genus.

Main Methods:

  • Isolation of bacteria from seawater samples from the East Sea, Korea.
  • Phylogenetic analysis using 16S rRNA gene sequences.
  • Determination of phenotypic characteristics including growth conditions (pH, temperature, salinity), cell wall composition, isoprenoid quinones, cellular fatty acids, and DNA G+C content.

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Main Results:

  • A novel Gram-positive, slightly halophilic, rod-shaped bacterium, strain CL-DD14(T), was isolated.
  • Phylogenetic analysis revealed low sequence similarity (94.1-97.1%) to recognized Nocardioides species.
  • Phenotypic characterization supported the classification of CL-DD14(T) as a new species, Nocardioides marinus sp. nov., with specific growth ranges and biochemical markers.
  • The DNA G+C content was determined to be 72.9 mol%.

Conclusions:

  • Strain CL-DD14(T) represents a novel species of the genus Nocardioides, named Nocardioides marinus sp. nov.
  • This finding expands the known diversity within the Nocardioides genus.
  • The study provides a comprehensive description of the new species based on polyphasic taxonomic data.