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Rawirat Pansomsuay1, Thitikorn Duangupama1, Pattama Pittayakhajonwut2

  • 1Department of Biology, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10520, Thailand.

International Journal of Systematic and Evolutionary Microbiology
|June 8, 2023
PubMed
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A novel endophytic actinobacterium, Streptomyces zingiberis sp. nov. strain PLAI 1-29T, was discovered in Thailand. This new species, isolated from ginger root, expands the known diversity of Streptomyces.

Area of Science:

  • Microbiology
  • Taxonomy
  • Genomics

Background:

  • Endophytic actinobacteria, particularly from the genus Streptomyces, are known for producing bioactive compounds.
  • Zingiber montanum is a plant species with traditional medicinal uses, potentially harboring unique microbial symbionts.

Purpose of the Study:

  • To isolate and characterize a novel endophytic actinobacterium from the root tissue of Zingiber montanum.
  • To determine the taxonomic position of the isolate using a polyphasic approach, including genomic analysis.

Main Methods:

  • Isolation of strain PLAI 1-29T from Zingiber montanum root tissue.
  • Polyphasic characterization including morphological, chemotaxonomic, physiological, and biochemical analyses.
  • Genome-based analysis including average nucleotide identity (ANI), average amino acid identity (AAI), and digital DNA-DNA hybridization (dDDH).
Keywords:
16S rRNA geneStreptomycesZingiber montanumendophytic actinomycetewhole-genome analysis

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Main Results:

  • Strain PLAI 1-29T exhibited morphological and chemotaxonomic properties consistent with the genus Streptomyces.
  • Genomic analysis showed low ANI (84.0%), AAI (80.0%), and dDDH (27.6%) values compared to the closest type strain, Streptomyces xinghaiensis S187T.
  • Strain PLAI 1-29T was differentiated from related species by distinct physiological and biochemical characteristics.

Conclusions:

  • Strain PLAI 1-29T represents a new species within the genus Streptomyces.
  • The proposed name for this novel species is Streptomyces zingiberis sp. nov.
  • This discovery highlights the potential of endophytic actinobacteria from medicinal plants as sources of novel microbial diversity.