Rasamsonia, a new genus comprising thermotolerant and thermophilic Talaromyces and Geosmithia species
- Author: mycolabadmin
- 2011-10-02
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Summary
This research established a new genus of heat-loving fungi called Rasamsonia. These fungi are unique because they can grow at high temperatures (37°C or higher) and have distinct microscopic features. The study used modern DNA analysis and traditional methods to properly classify these organisms that were previously misplaced in other fungal groups.
Impacts on everyday life:
– Improved identification of fungi in medical settings, as some Rasamsonia species can cause infections in immunocompromised patients
– Better understanding of heat-resistant fungi that can survive food processing
– Enhanced knowledge of fungi that produce potentially useful compounds
– More accurate classification helps in controlling fungal contamination in industrial processes
– Better prediction of fungal behavior in warming environments
Background
The phylogenetic relationship among thermophilic and thermotolerant fungi in the Trichocomaceae family was poorly understood. Several species were classified in different genera including Talaromyces and Geosmithia based mainly on phenotypic and physiological characters. A systematic study was needed to properly classify these organisms based on molecular and morphological evidence.
Objective
To study the phylogenetic relationship among Geosmithia argillacea, Talaromyces emersonii, T. byssochlamydoides and other members of the Trichocomaceae using molecular markers and phenotypic characters, and to establish proper taxonomic classification of these thermophilic/thermotolerant species.
Results
The molecular and phenotypic analyses showed that these species form a distinct clade within the Trichocomaceae, with Trichocoma paradoxa as the closest relative. Based on these findings, the new genus Rasamsonia was proposed to accommodate these species. The genus is characterized by thermotolerance/thermophilia, conidiophores with distinctly rough-walled stipes, olive-brown conidia and scanty covering of ascomata when present. Five new combinations were proposed and one new species (R. brevistipitata) was described.
Conclusion
The study established Rasamsonia as a new genus distinct from other Trichocomaceae genera, containing thermophilic and thermotolerant species previously classified in Talaromyces and Geosmithia. The genus is well-defined by both molecular and morphological characteristics, including growth temperature preferences, conidiophore structure, and spore characteristics.
- Published in:Antonie Van Leeuwenhoek,
- Study Type:Taxonomic Study,
- Source: 10.1007/s10482-011-9647-1