The Behavior of Oppositional Alleles in Polyploids of Trifolium Repens

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Abstract
The 64-chromosome stolons of white clover, induced by colchicine treatment of seedlings, were found to be self-incompatible like the 32-chromosome plants from which they arose. In the F1 population from 2 of the 32-chromosome plants, 4 intra-sterile, inter-fertile groups were found, and all F1 plants were reciprocally compatible with both parents, indicating that the parents differed in all 4 oppositional alleles. In the F1 from the 2 corresponding 64-chromosome stolons, 3 plants were self-incompatible, and the remaining 26 were self-compatible. All intercrosses involving the self-compatible plants as [male][male] were compatible, but both compatible and incompatible matings were found when the self-incompatible parents and F1 plants were used as [male][male]. On the basis of these differential reactions, several genotypes were postulated. It is suggested that growth of pollen bearing 2 different alleles depends sometimes on the interaction between the stigma and all pollen upon it rather than on a specific oppositional effect.