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<p>A bacterial strain with chitin-degrading ability, designated FCG-7<sup>T</sup>, was isolated from a mangrove sediment in Guangxi, PR China, and characterized using a polyphasic taxonomy approach. Cells of strain FCG-7<sup>T</sup> were Gram-stain-negative, aerobic, rod-shaped and formed milky-white colonies. Growth occurred at 15–37 °C (optimum, 30 °C), at pH 7–9 (optimum, pH 7–8) and with 0–1% NaCl (optimum, 0.5%). The major isoprenoid quinone was ubiquinone-8 (Q-8). The predominant fatty acids were summed feature 3 (C<sub>16:1</sub> ω6c and/or C<sub>16:1</sub>ω7c) and C<sub>16:0</sub>. The polar lipids comprised phosphatidylethanolamine, diphosphatidylglycerol, five unidentified phospholipids and two unidentified aminophospholipids. The G + C content of the genomic DNA was 53.8%. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain FCG-7<sup>T</sup> belonged to the genus <i>Chitinibacter</i> and was closely related to <i>Chitinibacter bivalviorum</i> 2T18<sup>T</sup> (similarity 99.29%) and <i>Chitinibacter fontanus</i> STM-7<sup>T</sup> (similarity 98.85%). The average nucleotide identity (ANI) values of FCG-7<sup>T</sup> and the above two type strains were 81.4–83.1%, and the digital DNA-DNA hybridization (dDDH) values were 22.9–24.3%. Based on the phylogenetic, phenotypic, chemotaxonomic and genotypic characteristics, strain FCG-7<sup>T</sup> represents a novel species of the genus <i>Chitinibacter</i>, for which the name <i>Chitinibacter mangrovi</i> sp. nov. is proposed. The type strain is FCG-7<sup>T</sup> (= KCTC 8742<sup>T</sup> = GDMCC 1.4868<sup>T</sup>).</p>

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Chitinibacter mangrovi sp. nov., a Novel Chitin-Degrading Bacterium Isolated from Mangrove Sediment

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Yong Xu,
  • Longzhi Chen,
  • Liyan Yang,
  • Lixia Pan,
  • Mengting Zheng,
  • Naikun Shen,
  • Dengfeng Yang

摘要

A bacterial strain with chitin-degrading ability, designated FCG-7T, was isolated from a mangrove sediment in Guangxi, PR China, and characterized using a polyphasic taxonomy approach. Cells of strain FCG-7T were Gram-stain-negative, aerobic, rod-shaped and formed milky-white colonies. Growth occurred at 15–37 °C (optimum, 30 °C), at pH 7–9 (optimum, pH 7–8) and with 0–1% NaCl (optimum, 0.5%). The major isoprenoid quinone was ubiquinone-8 (Q-8). The predominant fatty acids were summed feature 3 (C16:1 ω6c and/or C16:1ω7c) and C16:0. The polar lipids comprised phosphatidylethanolamine, diphosphatidylglycerol, five unidentified phospholipids and two unidentified aminophospholipids. The G + C content of the genomic DNA was 53.8%. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain FCG-7T belonged to the genus Chitinibacter and was closely related to Chitinibacter bivalviorum 2T18T (similarity 99.29%) and Chitinibacter fontanus STM-7T (similarity 98.85%). The average nucleotide identity (ANI) values of FCG-7T and the above two type strains were 81.4–83.1%, and the digital DNA-DNA hybridization (dDDH) values were 22.9–24.3%. Based on the phylogenetic, phenotypic, chemotaxonomic and genotypic characteristics, strain FCG-7T represents a novel species of the genus Chitinibacter, for which the name Chitinibacter mangrovi sp. nov. is proposed. The type strain is FCG-7T (= KCTC 8742T = GDMCC 1.4868T).