XVI International Botanical Congess

In the model object (genus Lycopersicon) with a gametophylic self-incompatibility system, a rise of interaction has shown between alleles in S-locus in hybrids arisen from three category species combinations: self-compatible ScSc, self-incompatible SiSi, and self-fertile SfSf. These facts demonstrate that the relaxation of the reaction of more active alleles Si and Sf has observed in the pollen and pistil of hybrids. At the same time, the intensification of less active Sc-allele has occurred in hybrids pollen. This data contradicts the Lewis-Crowe's principle of S-alleles independent effect. The new ideas about the evolution of self-compatibility in flowering plants have been developed, according to which the rise and establishment of complete self-compatibility had occurred without Lewis-Crowe Sc' hypothetical stage.