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Bacillus cavernae sp. nov. isolated from cave soil.

Liling Feng1, Dongmei Liu1, Xuelian Sun1

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A novel bacterium, Bacillus cavernae sp. nov. strain L5T, was discovered in Tenglong cave soil. This strictly aerobic, spore-forming organism exhibits unique pink colony coloration and low nutrient requirements, expanding the diversity of the Bacillus genus.

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Area of Science:

  • Microbiology
  • Bacterial Taxonomy
  • Environmental Microbiology

Background:

  • The genus Bacillus encompasses diverse, spore-forming bacteria with significant roles in various environments.
  • Microbial diversity in unique geological formations like caves remains incompletely characterized.
  • Accurate taxonomic classification is crucial for understanding bacterial evolution and ecological functions.

Purpose of the Study:

  • To isolate and characterize a novel bacterial strain from Tenglong cave soil.
  • To determine the taxonomic placement of the novel isolate using polyphasic characterization.
  • To propose a new species within the genus Bacillus.

Main Methods:

  • Isolation and cultivation of bacteria from soil samples.
  • Gram staining, motility tests, and assessment of aerobic respiration.
  • 16S rRNA gene sequencing for phylogenetic analysis.
  • Determination of DNA G+C content, major menaquinone, and fatty acid profiles.
  • Analysis of polar lipids and cell-wall peptidoglycan composition.

Main Results:

  • A novel Gram-positive, spore-forming, motile, strictly aerobic rod, designated strain L5T, was isolated.
  • Phylogenetic analysis based on 16S rRNA gene sequences indicated closest relationships to Bacillus asahii, Bacillus kribbensis, and Bacillus deserti.
  • Strain L5T exhibited distinct phenotypic characteristics, including pink colony color, low growth temperature, and low nutrient requirements.
  • Chemotaxonomic analyses revealed a DNA G+C content of 45.6 mol%, MK-7 as the major menaquinone, and specific fatty acid and polar lipid profiles.

Conclusions:

  • Strain L5T represents a distinct genotypic and phenotypic entity within the genus Bacillus.
  • Based on comprehensive analyses, strain L5T is proposed as a novel species, Bacillus cavernae sp. nov.
  • The discovery of Bacillus cavernae sp. nov. contributes to the understanding of microbial diversity in cave ecosystems.