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Updated: Jun 21, 2026
10:33
Isolation of Culturable Yeasts and Molds from Soils to Investigate Fungal Population Structure
Published on: May 27, 2022
Rhodotorula arctica sp. nov., a basidiomycetous yeast from Arctic soil
1Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK 74075, USA.
Summary
A new yeast species, Rhodotorula arctica, has been identified. This species is distinct from its closest relative, Bensingtonia yamatoana, based on nutritional requirements and genetic sequencing.
Area of Science:
- Microbiology
- Mycology
- Yeast Taxonomy
Background:
- The genus Rhodotorula comprises yeasts with significant ecological and industrial roles.
- Accurate species delineation is crucial for understanding microbial diversity and function.
Purpose of the Study:
- To characterize and formally describe a novel yeast species, Rhodotorula arctica.
- To differentiate R. arctica from its closest known relative, Bensingtonia yamatoana.
Main Methods:
- Phenotypic characterization, including nutritional requirement testing (thiamine, maltose, quinate, L-arginine, L-citrulline).
- Molecular identification using ribosomal DNA (rDNA) sequencing of the Large Subunit D1/D2 region and the Internal Transcribed Spacer (ITS) region.
Main Results:
- Three isolates were identified as representing a novel species, Rhodotorula arctica.
- R. arctica differs from B. yamatoana by requiring thiamine and inability to assimilate maltose and quinate.
- Genetic analysis revealed distinct rDNA LSU D1/D2 (4 positions) and ITS (9 positions) sequences compared to B. yamatoana.
- One isolate exhibited unique nitrogen source requirements (L-arginine or L-citrulline).
Conclusions:
- Rhodotorula arctica is proposed as a new species based on distinct phenotypic and genotypic characteristics.
- The study establishes clear criteria for differentiating R. arctica from B. yamatoana.
- Further research into the ecological role and metabolic capabilities of R. arctica is warranted.
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