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Aquabacterium terrae sp. nov., isolated from soil.

Ram Hari Dahal1, Ji Yeon Han2, Hyosun Lee2

  • 1Department of Microbiology, School of Medicine, Kyungpook National University, Daegu, 41944, Republic of Korea.

Archives of Microbiology
|April 7, 2021
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Summary

A novel yellow bacterium, Aquabacterium terrae S2T, was discovered in South Korean soil. This strictly aerobic, Gram-negative bacterium represents a new species within the Aquabacterium genus.

Keywords:
Aquabacterium tarraeSoilUncultured species

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Area of Science:

  • Microbiology
  • Bacteriology
  • Genomics

Background:

  • Isolation of a novel yellow-colored bacterial strain, designated S2T, from soil in South Korea.
  • Characterization of its phenotypic and genotypic properties is crucial for taxonomic classification.

Purpose of the Study:

  • To isolate and characterize a novel bacterial species from soil.
  • To determine its phylogenetic relationship to known bacterial taxa.
  • To propose a new species name and designation for the isolate.

Main Methods:

  • Isolation and cultivation of bacterial strain S2T.
  • Morphological, physiological, and biochemical characterization.
  • Fatty acid analysis, respiratory quinone determination, and polar lipid profiling.
  • 16S rRNA gene sequencing and phylogenetic analysis.
  • Genome sequencing and analysis, including G+C content determination.
  • Average nucleotide identity (ANI) and in silico DNA-DNA hybridization (isDDH) calculations.

Main Results:

  • Strain S2T is a strictly aerobic, Gram-negative, motile, rod-shaped bacterium.
  • Optimal growth conditions determined for temperature, pH, and salinity.
  • Major fatty acids include summed feature 3, C16:0, and summed feature 8.
  • Phylogenetic analysis based on 16S rRNA gene sequence shows closest relation to Aquabacterium pictum W35T (98.4% similarity).
  • Genome size is 8,039,486 bp with 56 scaffolds and a G+C content of 69.4%.
  • ANI and isDDH values are ≤77.9% and ≤21.4%, respectively, distinguishing it from related taxa.

Conclusions:

  • Strain S2T represents a novel species within the genus Aquabacterium.
  • The proposed name for the novel species is Aquabacterium terrae sp. nov.
  • The type strain is S2T (KCTC 72741T = NBRC 114609T).