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<p>Two aerobic bacterial isolates, designated as strains CA2-7<sup>T</sup> and CA1UV-4<sup>T</sup>, were isolated from soil samples collected at a construction site in Cheonan. Both strains were identified as Gram-stain-negative, rod-shaped and a phylogenetic analysis based on 16S rRNA gene sequences indicated that these strains constitute a distinct lineage within the family <i>Hymenobacter</i> (order <i>Cytophagales</i>, class <i>Cytophagia</i>). The closest genetic relatives were found to be members of the genus <i>Hymenobacter</i>, specifically <i>Hymenobacter ginkgonis</i> HMF4947<sup>T</sup> (with 16S rRNA gene sequence similarity of 97.28%) and <i>Hymenobacter segetis</i> S7-3-11<sup>T</sup> (98.10%). Both strains grew optimally at pH 7.0, 25&#xa0;°C, without NaCl. Fatty acid analysis revealed distinctive profiles, with C<sub>15:0</sub> anteiso and C<sub>15:0</sub> iso predominating in strain CA2-7<sup>T</sup>, while C<sub>15:0</sub> iso and summed feature 3 (C<sub>16:1</sub> <i>ω</i>7<i>c</i>/C<sub>16:1</sub> <i>ω</i>6<i>c</i>) were the primary fatty acids in strain CA1UV-4<sup>T</sup>. Both strains exhibited MK-7 as the major respiratory quinone. Biochemical, chemotaxonomic, and phylogenetic data support CA2-7<sup>T</sup> and CA1UV-4<sup>T</sup> as new <i>Hymenobacter</i> species. Accordingly, we suggest the names <i>Hymenobacter cheonanensis</i> and <i>Hymenobacter convexus</i> for strains CA2-7<sup>T</sup> (= KCTC 92968<sup>T</sup> = NBRC 116577<sup>T</sup>) and CA1UV-4<sup>T</sup> (= KCTC 92970<sup>T</sup> = NBRC 116576<sup>T</sup>), respectively.</p>

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Hymenobacter cheonanensis sp. nov., and Hymenobacter convexus sp. nov. isolated from the construction site

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Ji-yun Son,
  • Sathiyaraj Srinivasan

摘要

Two aerobic bacterial isolates, designated as strains CA2-7T and CA1UV-4T, were isolated from soil samples collected at a construction site in Cheonan. Both strains were identified as Gram-stain-negative, rod-shaped and a phylogenetic analysis based on 16S rRNA gene sequences indicated that these strains constitute a distinct lineage within the family Hymenobacter (order Cytophagales, class Cytophagia). The closest genetic relatives were found to be members of the genus Hymenobacter, specifically Hymenobacter ginkgonis HMF4947T (with 16S rRNA gene sequence similarity of 97.28%) and Hymenobacter segetis S7-3-11T (98.10%). Both strains grew optimally at pH 7.0, 25 °C, without NaCl. Fatty acid analysis revealed distinctive profiles, with C15:0 anteiso and C15:0 iso predominating in strain CA2-7T, while C15:0 iso and summed feature 3 (C16:1 ω7c/C16:1 ω6c) were the primary fatty acids in strain CA1UV-4T. Both strains exhibited MK-7 as the major respiratory quinone. Biochemical, chemotaxonomic, and phylogenetic data support CA2-7T and CA1UV-4T as new Hymenobacter species. Accordingly, we suggest the names Hymenobacter cheonanensis and Hymenobacter convexus for strains CA2-7T (= KCTC 92968T = NBRC 116577T) and CA1UV-4T (= KCTC 92970T = NBRC 116576T), respectively.