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<p>The taxonomic position of <i>Microbacterium chocolatum</i> was evaluated through 16S rRNA gene sequence and genome-based analyses. The pairwise similarity of the 16S rRNA gene sequence retrieved from the genome data between <i>Microbacterium aurantiacum</i> KACC 20510<sup>T</sup> and <i>Microbacterium chocolatum</i> JCM 12412<sup>T</sup> was 99.3%, while between <i>Microbacterium kitamiense</i> JCM 10270<sup>T</sup> and <i>M. chocolatum</i> JCM 12412<sup>T</sup> was 99.4%. The similarity between <i>M. aurantiacum</i> KACC 20510<sup>T</sup> and <i>M. kitamiense</i> JCM 10270<sup>T</sup> was 100%. In the phylogenomic tree (based on 71 bacterial single-copy genes), <i>M. aurantiacum</i> KACC 20510<sup>T</sup>, <i>M. kitamiense</i> JCM 10270<sup>T</sup> and <i>M. chocolatum</i> JCM 12412<sup>T</sup> showed no genetic divergence. The average nucleotide identity (ANI), and digital DNA–DNA hybridization (dDDH) values among <i>M. aurantiacum</i> KACC 20510<sup>T</sup>, <i>M. chocolatum</i> JCM 12412<sup>T</sup> and <i>M. kitamiense</i> JCM 10270<sup>T</sup> were above the cut-off values (95–96% for ANI and 70% for dDDH) for species delineation. This study supports the previous reclassification of <i>Microbacterium kitamiense</i> Matsuyama et al. 1999 as a later heterotypic synonym of <i>Microbacterium aurantiacum</i> Takeuchi and Hatano 1998, and also proposes that <i>Microbacterium chocolatum</i> Takeuchi and Hatano 1998 is a later heterotypic synonym of <i>Microbacterium aurantiacum</i> Takeuchi and Hatano 1998.</p>

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Reclassification of Microbacterium chocolatum Takeuchi and Hatano 1998 as a Later Heterotypic Synonym of Microbacterium aurantiacum Takeuchi and Hatano 1998

  • 期刊论文

  • 发表日期：

    2025年5月23日

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  • Rattiya Janthanom,
  • Syed Raziuddin Quadri,
  • Ngoc Tung Quach,
  • Manik Prabhu Narsing Rao,
  • Arinthip Thamchaipenet

摘要

The taxonomic position of Microbacterium chocolatum was evaluated through 16S rRNA gene sequence and genome-based analyses. The pairwise similarity of the 16S rRNA gene sequence retrieved from the genome data between Microbacterium aurantiacum KACC 20510T and Microbacterium chocolatum JCM 12412T was 99.3%, while between Microbacterium kitamiense JCM 10270T and M. chocolatum JCM 12412T was 99.4%. The similarity between M. aurantiacum KACC 20510T and M. kitamiense JCM 10270T was 100%. In the phylogenomic tree (based on 71 bacterial single-copy genes), M. aurantiacum KACC 20510T, M. kitamiense JCM 10270T and M. chocolatum JCM 12412T showed no genetic divergence. The average nucleotide identity (ANI), and digital DNA–DNA hybridization (dDDH) values among M. aurantiacum KACC 20510T, M. chocolatum JCM 12412T and M. kitamiense JCM 10270T were above the cut-off values (95–96% for ANI and 70% for dDDH) for species delineation. This study supports the previous reclassification of Microbacterium kitamiense Matsuyama et al. 1999 as a later heterotypic synonym of Microbacterium aurantiacum Takeuchi and Hatano 1998, and also proposes that Microbacterium chocolatum Takeuchi and Hatano 1998 is a later heterotypic synonym of Microbacterium aurantiacum Takeuchi and Hatano 1998.