Abstract
Summary Wine Saccharomyces cerevisiae strains having high nDNA/nDNA homology with sibling species S. paradoxus or S. bayanus ( Rodrigues de Sousa et al. Syst. Appl. Microbiol. 18, 44–51 (1995) have been studied by genetic and karyotypic analyses. Despite the natural introgression the strains had the S. cerevisiae-S. paradoxus specific karyotype and belonged to the biological species S. cerevisiae . Their intraspecific hybrids were fertile having 28–99% ascospore viability and normal meiotic segregation of control markers while interspecific hybrids were sterile. The results demonstrate that molecular karyotyping is a reliable tool for delimiting strains of S. bayanus from S. cerevisiae and S. paradoxus . The latter two species, having nearly identical karyotypes, can be distinguished by genetic analysis. Several Saccharomyces sensu stricto strains monitored earlier by different molecular methods [ Guillamon et al. Int. J. Syst. Bacteriol. 44, 708–714 (1994); Molnar et al. System Appl. Microbiol. 18, 136–145 (1995)] have been reidentified genetically as S. bayanus and S. paradoxus .
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