A model for incongruity in intimate partner relationships is described . The model is tested with results from earlier research on intimate partner relationships in plants and these results are reinterpreted . It is demonstrated that in relationships between partners from different populations incongruity, i .e . non-functioning of a partner relationship resulting from a lack of genetic information in one partner about the other, plays a major role, while that of incompatibility is secondary or absent . Sexual partner relationships and host-parasite relationships are shown to be essentially similar as regards their genetic basis . Some practical implications of incongruity are mentioned .
A review of the literature is given to show that the hypothesis that non-functioning of the pistil-pollen relationship is solely based on the incompatibility system can no longer be maintained and that in non-functioning of the interpopulational pistil-pollen relationship/other principles are involved. A new theory regarding these principles is dealt with. The relationship between pistil and pollen is described as an intimate relationship based on matching genic systems which result from co-evolution. This theory allows two distinct mechanisms for the non-functioning of intimate partner relationships: incompatibility and incongruity. The nature, evolution, genetics and action of these mechanisms are compared. A simple letter model for matching genic systems and for incongruity in these systems is given. Applications of the new insight gained by the distinction between incompatibility and incongruity are reviewed and some consequences for research discussed. It is concluded that the influence of the S gene has been greatly overestimated, the importance of incongruity underestimated.
A brief survey is given of the genus Lycopersicon and of the breeding barriers within this genus . The importance of breaking these barriers is discussed in connection with the lack of knowledge of breeding barriers in general and the meagre exploitation of wild species of Lycopersicon in tomato breeding.
A brief survey is given of the occurrence of unilateral incompatibility between populations. It is reported how the unilateral incompatibility between L. peruviunum and L. esculentum has been broken stepwise by inbreeding with the aid of self-compatibility in L. peruvianum and selection in this self-compatibleL. peruvianum material for absence of L. esculentum pollen tube inhibition, and how L. peruviunum material has been developed on which large-scale L. peruvianum x L. esculentum hybrid production is possible. It is concluded that the unilateral incompatibility between L. esculentum and L. peruvianum consists of a complex of separate processes.
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