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Pseudoxanthomonas composti sp. nov., isolated from compost.

Jun Lin1, Guiqin Yang1, Jia Tang2

  • 1Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou, 510632, China.

Antonie Van Leeuwenhoek
|March 11, 2019
PubMed
Summary
This summary is machine-generated.

A novel bacterium, Pseudoxanthomonas composti sp. nov. GSS15T, was identified from compost. This Gram-negative rod expands the Pseudoxanthomonas genus with unique characteristics.

Keywords:
Novel speciesPolyphasic taxonomyPseudoxanthomonas composti

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Area of Science:

  • Microbiology
  • Bacterial Taxonomy
  • Environmental Microbiology

Background:

  • Compost environments harbor diverse microbial communities.
  • The genus Pseudoxanthomonas includes plant-associated and soil bacteria.
  • Characterization of novel bacterial isolates is crucial for understanding microbial diversity.

Purpose of the Study:

  • To isolate and characterize a novel bacterial strain from compost.
  • To determine the taxonomic position of the novel isolate using polyphasic characterization.
  • To propose a new species within the genus Pseudoxanthomonas.

Main Methods:

  • Isolation and cultivation of bacteria from compost.
  • Gram staining, cell morphology, and motility assessment.
  • Physiological tests including temperature, pH, and salt tolerance.
  • 16S rRNA gene sequencing for phylogenetic analysis.
  • Genomic analysis including Average Nucleotide Identity (ANI) and DNA-DNA hybridization (DDH).
  • Chemotaxonomic analysis of respiratory quinones, cellular fatty acids, and polar lipids.

Main Results:

  • Strain GSS15T is a Gram-negative, non-motile rod.
  • Optimal growth at 30°C, pH 8.0, and up to 6.0% NaCl.
  • 16S rRNA gene sequence similarity of 96.9% to Pseudoxanthomonas helianthi roo10T.
  • Low ANI (75.7-79.5%) and DDH (24.2-18.3%) values indicated a new species.
  • Predominant respiratory quinone Q-8; major fatty acids include iso-C15:0 and C16:1ω7c.
  • Polar lipids are phosphatidylethanolamine, phosphatidylglycerol, and diphosphatidylglycerol.

Conclusions:

  • Strain GSS15T represents a novel species within the genus Pseudoxanthomonas.
  • The proposed name for this new species is Pseudoxanthomonas composti sp. nov.
  • This discovery contributes to the known bacterial diversity in compost ecosystems.