Taxonomic significance of yeast sphaeroplast release after enzymatic treatment of intact cells

J Gen Microbiol. 1979 Jul;113(1):147-53. doi: 10.1099/00221287-113-1-147.


Treatment of whole yeast cells with a mixture of a reducing agent and 1,3-beta-glucanase isolated from Basidiomycete QM806 led to the production of sphaeroplasts from ascomycetes, from some fungi imperfecti, but not from basidiomycetes. Association of 1,3-beta-glucanase with a second enzyme, 1,4-alpha-glucanase, from Trichoderma viride, was required for sphaeroplast release from some, but not all, basidiomycetes and fungi imperfecti. The ability of yeast cells to liberate sphaeroplasts following appropriate enzymic treatment is proposed as a taxonomic criterion for differentiating basidiomycetous from ascomycetous yeasts and for classifying fungi imperfecti yeasts.

MeSH terms

  • Ascomycota / classification*
  • Ascomycota / cytology
  • Ascomycota / metabolism
  • Basidiomycota / classification*
  • Basidiomycota / cytology
  • Basidiomycota / metabolism
  • Cell Wall / metabolism
  • Glycoside Hydrolases / metabolism
  • Mitosporic Fungi / classification
  • Spheroplasts*


  • Glycoside Hydrolases