Antonie van Leeuwenhoek

, Volume 60, Issue 1, pp 13–19 | Cite as

DNA relatedness among saturn-spored yeasts assigned to the generaWilliopsis andPichia

  • Cletus P. Kurtzman


Saturn-spored species assigned to the generaWilliopsis andPichia were compared from extent of nuclear DNA complementarity. Of thePichia spp., four were recognized as distinct taxa:P. dispora, P. saitoi, P. zaruensis andPichia sp. nov. AmongWilliopsis spp., the following were accepted:W. californica, W. mucosa comb. nov.,W. pratensis, W. saturnus var.saturnus, W. saturnus var.mrakii comb. nov.,W. saturnus var.sargentensis comb. nov.,W. saturnus var.subsufficiens comb. nov. andWilliopsis sp. nov. The newPichia andWilliopsis species are described elsewhere. Moderate (36–68%) DNA relatedness was detected between the formerPichia sargentensis and varieties ofW. saturnus again demonstrating that nitrate assimilation is not a reliable criterion for separating yeast species.

Key words

DNA relatedness Pichia saturn-spored yeasts species formation Williopsis 


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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • Cletus P. Kurtzman
    • 1
  1. 1.Microbial Properties Research, National Center for Agricultural Utilization Research, Agricultural Research ServiceU.S. Department of AgriculturePeoriaUSA

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