Sex in the cold: taxonomic reorganization of psychrotolerant yeasts in the order Leucosporidiales

VIRGINIA DE GARCIA; MARCO A. COELHO; TERESA M. MAIA; LUIZ H. ROSA; ALINE MARTINS VAZ; CARLOS A. ROSA; JOSE PAULO SAMPAIO; PAULA GONCALVES; MARIA VAN BROOCK; DIEGO LIBKIND

FEMS YEAST RESEARCH

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2015

1567-1356

Species of Leucosporidiales are a group of psychrotolerant yeasts with biotechnological potential. In the present work, we studied the phenotypic, genetic and sexual characteristics of three species of this genus (Leucosporidium scottii, Leucosporidiella creatinivora and Le. yakutica) to clarify the evolutionary relationship among these closely related taxa. From the results obtained, it becomes clear that these yeasts can interbreed. Although genetic delimitation is possible for the three species, the extent of nucleotide substitutions and phenotypic differences observed between them are lower than that expected for species that have ended the speciation process. Our taxonomic conclusion is to maintain the three taxa until further genomic data are gathered. However the concept of Leucosporidium scottii species-complex is proposed for this group of species. Finally, we transfer all Leucosporidiella and Mastigobasidium species to Leucosporidium (Leucosporidiales), and, in order to end the polyphyly condition of these taxa, we propose the new genus Pseudoleucosporidium gen. nov. and the new combination P. fasciculatum comb. nov.