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<p>A Gram-stain-negative, facultative anaerobic, rod-shaped and non-motile bacterium, designated as H15<sup>T</sup>, was isolated from the sediments of mangrove plant <i>Bruguiera sexangula</i>, taken from Shenzhen, Guangdong, China. Growth of strain H15<sup>T</sup> was observed at 10–41℃ (optimum, 28–30℃), 5.0–9.0 (optimum, 7.0), and in NaCl concentrations of 0–12% (optimum, 3.0–4.0%). Strain H15<sup>T</sup> shared the highest 16S rRNA gene sequence similarity with <i>Salipiger mangrovisoli</i> 6D45A<sup>T</sup> (98.7%), followed by <i>Salipiger pacificus</i> DSM 26,894<sup>T</sup> (98.6%). The genome of strain H15<sup>T</sup> was sequenced to be 6.1&#xa0;Mb in length, with a G + C content of 68.5%. Phylogenomic trees constructed using GTDB-Tk and UBCG have shown that strain H15<sup>T</sup> fell within the clade consisting of type strains of the genus <i>Salipiger</i>. Between strain H15<sup>T</sup> and <i>Salipiger</i> strains, the AAI values were 73.5–89.1%, which were above the thresholds for genus demarcation, while the ANIb and dDDH values were 76.9–87.5% and 20.4–33.7%, both of which were below the thresholds for species delimitation. The chemotaxonomic characteristics including the profiles of cellular fatty acids, polar lipids and respiratory quinones identified in strain H15<sup>T</sup> were consistent with those of <i>Salipiger</i> strains, except for some minor differences. Therefore, basing on the above taxonomic data, strain H15<sup>T</sup> is suggested to represent a novel species of the genus <i>Salipiger</i>, with a proposed name of <i>Salipiger bruguierae</i> sp. nov. The type strain is H15<sup>T</sup> (= KCTC 92858<sup>T</sup> = MCCC 1K08422<sup>T</sup>). Furthermore, comparative genomic analyses reveal the substantial biosynthetic potential and significant application potential in aromatic compounds degradation of <i>Salipiger</i> strains.</p>

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Description and Comparative Genomic Analysis of Salipiger Bruguierae sp. nov., a Novel Member of the Family Roseobacteraceae Isolated from Mangrove Sediments

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Qiangcai He,
  • Shaoshuai Tang,
  • Zhen Gan,
  • Dakun Chen,
  • Huimin Fan,
  • Yishan Lu,
  • Meng Long

摘要

A Gram-stain-negative, facultative anaerobic, rod-shaped and non-motile bacterium, designated as H15T, was isolated from the sediments of mangrove plant Bruguiera sexangula, taken from Shenzhen, Guangdong, China. Growth of strain H15T was observed at 10–41℃ (optimum, 28–30℃), 5.0–9.0 (optimum, 7.0), and in NaCl concentrations of 0–12% (optimum, 3.0–4.0%). Strain H15T shared the highest 16S rRNA gene sequence similarity with Salipiger mangrovisoli 6D45AT (98.7%), followed by Salipiger pacificus DSM 26,894T (98.6%). The genome of strain H15T was sequenced to be 6.1 Mb in length, with a G + C content of 68.5%. Phylogenomic trees constructed using GTDB-Tk and UBCG have shown that strain H15T fell within the clade consisting of type strains of the genus Salipiger. Between strain H15T and Salipiger strains, the AAI values were 73.5–89.1%, which were above the thresholds for genus demarcation, while the ANIb and dDDH values were 76.9–87.5% and 20.4–33.7%, both of which were below the thresholds for species delimitation. The chemotaxonomic characteristics including the profiles of cellular fatty acids, polar lipids and respiratory quinones identified in strain H15T were consistent with those of Salipiger strains, except for some minor differences. Therefore, basing on the above taxonomic data, strain H15T is suggested to represent a novel species of the genus Salipiger, with a proposed name of Salipiger bruguierae sp. nov. The type strain is H15T (= KCTC 92858T = MCCC 1K08422T). Furthermore, comparative genomic analyses reveal the substantial biosynthetic potential and significant application potential in aromatic compounds degradation of Salipiger strains.