Over 80% of the Earth’s environments are permanently or periodically exposed to temperatures below 5 °C. Cold habitats harbour a wide diversity of psychrophilic and psychrotolerant yeasts. During ecological studies of yeast communities carried out in cold ecosystem in the Italian Alps, Svalbard (Norway, Arctic region), and Portugal, 23 yeast strains that could not be assigned to any known fungal taxa were isolated. In particular, two of them were first identified as sp., showing the highest degree of D1/D2 sequence identity with accounted to only 97% with the type strain ( CBS 2221). The other 21 strains, exhibiting identical D1/D2 sequences, had low identity (97%) with and . Similarly, ITS sequences of the type strains of the most closely related species (93⁻94%). In a 2-genes multilocus D1/D2 and ITS ML phylogenetic tree, the studied strains pooled in two well separated and supported groups. In order to classify the new 23 isolates based on phylogenetic evidences, we propose the description of two novel species sp. nov. and sp. nov.
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| http://dx.doi.org/10.3390/life8020009 | DOI Listing |
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