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Lysobacter segetis sp. nov., Isolated from Soil.

Leonid N Ten1, Jongguen Jeon1, Nabil Salah Elderiny1

  • 1School of Applied Biosciences, Kyungpook National University, Daegu, 41566, Republic of Korea.

Current Microbiology
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A novel bacterium, Lysobacter segetis, was isolated from Korean soil. This Gram-negative, aerobic bacterium represents a new species within the Lysobacter genus, distinguished by its unique genetic and physiological characteristics.

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Area of Science:

  • Microbiology
  • Bacterial Taxonomy
  • Genomics

Background:

  • The genus Lysobacter comprises Gram-negative bacteria known for diverse ecological roles.
  • Accurate classification of bacterial species is crucial for understanding microbial diversity and function.

Purpose of the Study:

  • To characterize a novel bacterial isolate from a soil sample from Jeju Island, Republic of Korea.
  • To determine the taxonomic position of the isolate within the genus Lysobacter.

Main Methods:

  • Isolation and cultivation of strain 17J68-2T from soil.
  • Phylogenetic analysis based on 16S rRNA gene sequencing.
  • Determination of physiological and biochemical characteristics.
  • Genome sequencing and analysis (G+C content, size).
  • Analysis of polar lipids, respiratory quinones, and major fatty acids.
  • DNA-DNA hybridization experiments.

Main Results:

  • Strain 17J68-2T is a Gram-negative, aerobic, motile, rod-shaped bacterium.
  • High 16S rRNA gene similarity (98.1-98.4%) to Lysobacter humi, L. xinjiangensis, and L. mobilis.
  • Distinct physiological properties including growth temperature range (15-42 °C), pH range (7-8), and salt tolerance (0-1.0% NaCl).
  • Genome size of 2.94 Mb with 70.5% G+C content.
  • Unique polar lipid, respiratory quinone, and fatty acid profiles.
  • Low DNA-DNA relatedness (<40%) with closely related species.

Conclusions:

  • Strain 17J68-2T is phenotypically and genotypically distinct from known Lysobacter species.
  • The isolate represents a novel species of the genus Lysobacter.
  • The proposed name for this new species is Lysobacter segetis sp. nov.