Abstract
In 2006 several yeast-like fungi were isolated from apples that showed a postharvest disorder named “white haze.” These strains were morphologically and molecularly assigned to the genus Tilletiopsis. Following the recent reclassification of yeasts in Ustilaginomycotina and the genus Tilletiopsis in particular, species that caused “white haze” disorder were re-identified based on the phylogenetic analysis of five DNA-loci (ITS, LSU, SSU, RPB2, and TEF1) and analysis of D1/D2 domains of the 26S/28S rRNA (LSU). Six novel species belonging to three orders in the Exobasidiomycetes, namely Entyloma belangeri (holotype: CBS 111600; ex-type: DSM 29114) MB 823155, Entyloma davenportii (holotype: CBS 111604; ex-type: DSM 100135) MB 823154, Entyloma elstari (holotype: CBS 111593; ex-type: DSM 29113) MB 823153, Entyloma randwijkense (holotype: CBS 111606; ex-type: DSM 100136) MB 823156, Jamesdicksonia mali (holotype: CBS 111625; ex-type: DSM 29121) MB 823151 and Golubevia heteromorpha (holotype: CBS 111610; ex-type: DSM 100176) MB 823152 are proposed to accommodate these strains. In addition, sequences representing phylogenetically related but yet undescribed fungi were obtained from GenBank in order to show the diversity of Tilletiopsis-like yeast states in Exobasidiomycetes.
Highlights
Species of the genus Tilletiopsis are saprotrophic yeast-like basidiomycete fungi
We describe six new species and indicate possible novel taxa based on the phylogenetic analysis of LSU rDNA sequences from public repositories
Other LSU sequences obtained from NCBI GenBank1 and analyzed here represent potential novel species that were originally identified as members of the genus Tilletiopsis by the authors (Fungsin, 2003; Jindamorakot, 2006; Takashima et al, 2012)
Summary
Species of the genus Tilletiopsis are saprotrophic yeast-like basidiomycete fungi. The name Tilletiopsis was first introduced by Derx (1930) and was chosen to reflect the morphological resemblance of his isolates to species of the smut fungi Tilletia. Eighteen years later, Derx (1948) described the genus without designating a type species (Derx, 1948) The strain he was working with got lost so that Nyland (1950) selected a morphologically similar strain to serve as the neotype of the type species of the genus Tilletiopsis, which he named Tilletiopsis washingtonensis. Another species with smaller ballistospores was named Tilletiopsis minor, and both yeasts were isolated near Puyallup (Washington, United States) from living and dead plant material (Nyland, 1950). Two years later Tubaki described two additional species and a variety based on spore size and culture morphology, namely Tilletiopsis cremea, Tilletiopsis lilacina, and T. minor var. flava
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