[The genosystematics of yeast genera Willopsis zender and Zygowillopsis kudriavzev].

The data have been compared on the yeast genomic divergence obtained in genetic molecular and biological studies of the yeast genera Williopsis and Zygowilliopsis taken as an example. The hybridization analysis, the enzyme electrophoresis and DNA reassociation comprise the noncontradictory estimation of the yeasts relation. Different methods demonstrate a convincing species discreteness among the yeast genomes. The reproductive isolation of the yeast taxons is defined more invariably by the genetic methods. A new combination Williopsis sargentensis (Wickerham et Kurtzman) Naumov comb. nov. has been formed.