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<p>A novel actinobacterial strain NEAU-NA10<sup>T</sup> showing antifungal activity and plant growth-promoting ability was isolated from the rhizosphere soil of strawberry seedlings collected from Ya’an City, Sichuan Province, China (28°51′ N, 101°56′ E). A polyphasic taxonomic study was used to establish the status of strain NEAU-NA10<sup>T</sup>. 16S rRNA gene sequence analysis revealed that strain NEAU-NA10<sup>T</sup> belongs to the genus <i>Streptomyces</i> and shares the highest similarity (99.31%) with S<i>treptomyces canarius</i> CGMCC 4.1581<sup>T</sup>. Whole-genome comparisons with its reference strains demonstrated that the average nucleotide identity (ANIm) and digital DNA–DNA hybridization (dDDH) values ranged from 86.74 to 87.75% and 27.0 to 30.1%, respectively. The phospholipid profile contained diphosphatidylglycerol, phosphatidylethanolamine, and phosphatidylinositol. The diagnostic sugars in cell hydrolysates were determined to be ribose, and the cell wall contained <sub>LL</sub>-diaminopimelic acid as the diagnostic diamino acid. The predominant menaquinones were MK-9(H<sub>4</sub>), MK-9(H<sub>6</sub>) and MK-9(H<sub>8</sub>). The predominant cellular fatty acids (&gt;10%) were C<sub>16:0</sub>, C<sub>17:0</sub>, C<sub>18:0</sub>, and anteiso-C<sub>18:0</sub>. Meanwhile, genomic analysis revealed a genome size of 9,459,621 bp and a DNA G + C content of 71.81%, and indicated that strain NEAU-NA10<sup>T</sup> has the potential to degrade cellulose and produce amylase. Based on phenotypic, chemotaxonomic, and genotypic studies, strain NEAU-NA10<sup>T</sup> is considered to be a novel species of the genus <i>Streptomyces</i>, for which the name <i>Streptomyces aurantiaciflavus</i> sp. nov. is proposed, with NEAU-NA10<sup>T</sup> (=MCCC 1K08700<sup>T</sup> = JCM 36416<sup>T</sup>) as the type strain.</p>

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Streptomyces aurantiaciflavus sp. nov., a novel actinomycete isolated from rhizosphere soil with antifungal activity and plant growth-promoting ability

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Jiaxin Jin,
  • Xue Zhao,
  • Muxi Zhang,
  • Jiayi Xu,
  • Xingbo Wang,
  • Ran Zhang,
  • Yan Xu,
  • Zhen Song,
  • Jia Song,
  • Wensheng Xiang

摘要

A novel actinobacterial strain NEAU-NA10T showing antifungal activity and plant growth-promoting ability was isolated from the rhizosphere soil of strawberry seedlings collected from Ya’an City, Sichuan Province, China (28°51′ N, 101°56′ E). A polyphasic taxonomic study was used to establish the status of strain NEAU-NA10T. 16S rRNA gene sequence analysis revealed that strain NEAU-NA10T belongs to the genus Streptomyces and shares the highest similarity (99.31%) with Streptomyces canarius CGMCC 4.1581T. Whole-genome comparisons with its reference strains demonstrated that the average nucleotide identity (ANIm) and digital DNA–DNA hybridization (dDDH) values ranged from 86.74 to 87.75% and 27.0 to 30.1%, respectively. The phospholipid profile contained diphosphatidylglycerol, phosphatidylethanolamine, and phosphatidylinositol. The diagnostic sugars in cell hydrolysates were determined to be ribose, and the cell wall contained LL-diaminopimelic acid as the diagnostic diamino acid. The predominant menaquinones were MK-9(H4), MK-9(H6) and MK-9(H8). The predominant cellular fatty acids (>10%) were C16:0, C17:0, C18:0, and anteiso-C18:0. Meanwhile, genomic analysis revealed a genome size of 9,459,621 bp and a DNA G + C content of 71.81%, and indicated that strain NEAU-NA10T has the potential to degrade cellulose and produce amylase. Based on phenotypic, chemotaxonomic, and genotypic studies, strain NEAU-NA10T is considered to be a novel species of the genus Streptomyces, for which the name Streptomyces aurantiaciflavus sp. nov. is proposed, with NEAU-NA10T (=MCCC 1K08700T = JCM 36416T) as the type strain.