Abstract
The maintenance for several generations of interchange heterozygosity in both experimental and cultivated fields of rye is analysed. An experimental analysis of interchange heterozygotes has been carried out to ascertain whether only one or several translocations exist in the population. Interchange heterozygosity is discussed on the basis of the karyotypic orthoselection model. The maintenance of a constant frequency (20 per cent) of structural heterozygotes for several generations suggests the existence of an equilibrium. The possible mechanisms involved in such an equilibrium are discussed.
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