Summary
In order to identify the genotypic constitutions of incompatibility in the diploid species, Ipomoea leucantha Jacq. (K221), which is most closely related to the sweet potato, the progenies derived from the reciprocal crosses, backcrosses and testcrosses were analysed. All the plants examined were self-incompatible, and pollen germination was inhibited on the stigma after incompatible pollinations. No reciprocal differences were found in the incompatibility reactions. In the progenies three incompatibility groups were observed which showed the rather simple segregation ratios. The homozygous plants for incompatibility alleles were obtained in the progenies. The experimental results demonstrated a sporophytic type of incompatibility controlled by a single locus with multiple S-alleles exhibiting a dominance relationship in both the pollen and the stigma. The plants obtained in the progenies had the following genotypes: S 1 S 2, S 1 S 3, S 2 S 2, S 2 S 3 and S 3 S 3.
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Kowyama, Y., Shimano, N. & Kawase, T. Genetic analysis of incompatibility in the diploid Ipomoea species closely related to the sweet potato. Theoret. Appl. Genetics 58, 149–155 (1980). https://doi.org/10.1007/BF00263108
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DOI: https://doi.org/10.1007/BF00263108