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Crenobacter caeni sp. nov. Isolated from Sludge.

Zhou Yang1, Jianyi Xu1, Mengyao Sheng1

  • 1Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, China.

Current Microbiology
|October 13, 2020
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Summary
This summary is machine-generated.

A novel bacterium, Crenobacter caeni sp. nov. HX-7-9T, was discovered in activated sludge. This Gram-negative bacterium expands the Crenobacter genus with unique characteristics.

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Area of Science:

  • Microbiology
  • Bacteriology
  • Environmental Science

Background:

  • Activated sludge from agricultural chemical plants is a potential source of novel microorganisms.
  • The genus Crenobacter plays a role in environmental microbial communities.

Purpose of the Study:

  • To isolate and characterize a novel bacterial strain from activated sludge.
  • To determine the taxonomic placement of the novel strain within the Crenobacter genus.

Main Methods:

  • Isolation and cultivation of bacteria from activated sludge.
  • Gram staining, morphology, and motility tests.
  • 16S rRNA gene sequencing and phylogenetic analysis.
  • Genomic DNA G+C content determination.
  • Fatty acid analysis, respiratory ubiquinone analysis, and polar lipid profiling.
  • Average Nucleotide Identity (ANI) and digital DNA-DNA hybridization (dDDH) analyses.

Main Results:

  • Strain HX-7-9T is a Gram-negative, rod-shaped, flagellated bacterium.
  • Phylogenetic analysis places strain HX-7-9T within the genus Crenobacter, with 94.8% 16S rRNA gene similarity to Crenobacter luteus YIM-78141T.
  • ANI and dDDH values (79.8% and 19.1%, respectively) support its classification as a new species.
  • Optimal growth conditions were determined: 37°C, pH 7.0, and 0% NaCl.

Conclusions:

  • Strain HX-7-9T represents a novel species of the genus Crenobacter.
  • The proposed name for this new species is Crenobacter caeni sp. nov.
  • The type strain is HX-7-9T (KCTC 72654T, CCTCC AB 2019349T).