TABLE 5.
Analysis of the hybrid progeny
| Cross | Hybrid no. | Nuclear pattern | Mitochondrial pattern | Growth ona:
|
|
|---|---|---|---|---|---|
| YPD medium | SD | ||||
| Y184 × Y245 | 1–10 | S. cerevisiae and S. bayanus | S. cerevisiae | +++ | +++ |
| Y169 × Y244 | 1–10 | S. cerevisiae and S. bayanus | S. cerevisiae | +++ | +++ |
| Y185 × Y339 | 1–6 | S. exiguus | S. exiguus | + | + |
| Y184 × Y344 | 1–20 | CBS 6463 | ρ− | + | +/−b |
| Y345 × Y257 | 1–10 | S. exiguus | S. exiguus | +++ | + |
| 11–20 | S. castellii | S. castellii | + | + | |
| Y345 × Y344 | 1–10 | S. exiguus | S. exiguus | + | + |
| 11–20 | CBS 6463 | ρ− | + | + | |
| Y184 × Y344 | Y507 | CBS 6463 plus one band from S. cerevisiae | ρ− | + | +/− |
| Y257 × Y245 | Y500 | Mixed parental and new bands | S. bayanus | +++ | +++ |
a
+++, very good growth; −, no growth; +/−, very weak growth; +, weak growth.
b
Most of these hybrids had reduced viability on any medium, and they were difficult to propagate.