Geomonas soli gen. nov., sp. nov., a New Member of the Family Comamonadaceae, Isolated from Soil

Curr Microbiol. 2020 Feb;77(2):286-293. doi: 10.1007/s00284-019-01814-5. Epub 2019 Nov 21.


A Gram-stain negative, facultative aerobic bacterial strain, designated strain S-16T, was isolated from soil in South Korea. Colonies were white-milkish and cells were non-motile rods with oxidase- and catalase-positive activities. The growth of strain S-16T was observed at 20-40 °C (optimum, 25-30 °C) and pH 5.5-7.0 (optimum, pH 6.5). Ubiquinone-8 was identified as the sole respiratory quinone and C12:0, C16:0, C18:0, C15:1ω5c and summed feature 3 (comprising C16:1ω7c and/or C16:1ω6c) were identified as the major fatty acids (>5%). The major polar lipids consisted of phosphatidylethanolamine, phosphatidylglycerol, an unidentified aminophospholipid, two unidentified phospholipids and an unidentified polar lipid. The G + C content of the genomic DNA calculated from the whole genome sequence was 66.8 mol%. Strain S-16T was most closely related to Piscinibacter aquaticus IMCC1728T, Rhizobacter gummiphilus NS21T and Rhizobacter dauci H6T with 16S rRNA gene sequence similarities of 97.93%, 97.93% and 97.44%, respectively. Phylogenetic analyses based on 16S rRNA gene and whole genome sequences suggested that strain S-16T could form a distinct phyletic lineage as a new genus within the family Comamonadaceae. Based on the phenotypic, chemotaxonomic and molecular features, strain S-16T represents the type strain of a novel species of a novel genus within the family Comamonadaceae, for which the name Geomonas soli gen. nov., sp. nov. is proposed. The type strain is S-16T (= KACC 19792T = JCM 32971T).

MeSH terms

  • Bacterial Typing Techniques
  • Base Composition
  • Comamonadaceae / classification*
  • Comamonadaceae / isolation & purification
  • DNA, Bacterial / genetics
  • Fatty Acids / chemistry
  • Phospholipids / chemistry
  • Phylogeny*
  • RNA, Ribosomal, 16S / genetics
  • Republic of Korea
  • Sequence Analysis, DNA
  • Soil Microbiology*
  • Ubiquinone / chemistry
  • Whole Genome Sequencing


  • DNA, Bacterial
  • Fatty Acids
  • Phospholipids
  • RNA, Ribosomal, 16S
  • Ubiquinone
  • ubiquinone 8