Summary
Self-compatible (sc) plants from an I1 of the sc dihaploid G254 and from the reciprocal F1's of crosses between G254 and another sc dihaploid, B16, were crossed with the self-incompatible (si) dihaploid G609. The 34 progenies thus obtained were tested for self-compatibility. Only 2 progenies consisted merely of sc plants, the remaining ones showing a homogeneous series of 1 : 1 ratios. It is concluded that homozygosity for the S-bearing translocation mostly leads to lethality. Evidence is presented, that lethality takes place in the very early stages of the embryo and endosperm development. On the basis of the results the expected sc : si ratios in G254 × B16 and reciprocal are calculated to be 3.3 : 1. This ratio was found indeed in our experiments. These findings support the hypothesis put forward in earlier publications in this series, that self-compatibility in G254 and B16 is based on the presence of an S-bearing translocation.
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References
Hermsen, J. G. Th., 1978a. Genetics of self-compatibility in dihaploids of Solanum tuberosum L. 2. Detection and identification of all possible incompatibility and compatibility genotypes in six F1's from interdihaploid crosses. Euphytica 27: 1–11.
Hermsen, J. G. Th., 1978b. Genetics of self-compatibility in dihaploids of Solanum tuberosum L. 4. Linkage between an S-bearing translocation and a locus for virescens. Euphytica 27. In press.
Hermsen, J. G. Th., L. M. Taylor, E. W. M. van Breukelen & A. Lipski, 1978. Genetics of self-compatibility in dihaploids of Solanum tuberosum L. 6. Genetic analysis of the first inbred generation of two self-compatible dihaploids and their respective tetraploid parent cultivars. Euphytica 27. In press.
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Hermsen, J.G.T. Genetics of self-compatibility in dihaploids of Solanum tuberosum L. 3. Lethality of S-bearing translocation homozygotes. Euphytica 27, 13–17 (1978). https://doi.org/10.1007/BF00039114
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DOI: https://doi.org/10.1007/BF00039114