Table 2.
Recombinant test‐cross progeny derived from parent lines heterozygous for rust resistance genes at the M locus crossed to lines with no known M locus resistance genes.
| Genotype of heterozygous parent | Number of test‐cross progeny | Recombinants* | Reference | |
|---|---|---|---|---|
| MxMy | – | |||
| MM1 | 1 274 | 1† | 4 | Flor (1965) |
| 2 495 | 4 | 3 | This paper | |
| MM3 | 16 188 | 16 | 11 | Flor (1965) |
| 2 300 | 2 | — | Shepherd and Mayo (1972) | |
| MM4 | 1 504 | 1 | 3 | Flor (1965) |
| M1M3 | 5 838 | — | — | This paper |
| M1M4 | 776 | — | — | Flor (1965) |
| M3M4 | 1 471 | — | — | Flor (1965) |
| 6 306 | — | 1‡ | This paper | |
*
MxMy, recombinant expressing both parental resistance specificities; –, recombinant expressing neither parental specificity.
†
Plant died—not ascertained whether it was a recombinant or a heterozygous self.
‡
Examination of linked markers suggests that this individual arose not from a crossover recombination event, but from either a mutation of the M4 gene or from a conversion recombination event that altered M4 without an associated crossover (see text).