Karyotypes of yeast strains in the genus Torulaspora were determined b
y pulse-field gel electrophoresis and compared with those of the relat
ed genus Zygosaccharomyces. The DNA bands ranged from 800 to 1600 kb i
n T. delbrueckii and 800 to 2000 kb in both T. globosa and T. pretorie
nsis and those numbers were about six in the three species. The chromo
somes of Torulaspora strains comprised relatively smaller size of DNAs
than Zygosaccharomyces strains.