Abstract
Meiotic pairing was analysed in Aegilops variabilis×Secale cereale hybrids. Genome affinity between the U, S, and R genomes was estimated in meiotic metaphase I either by using C-banding or by applying theoretical models. The obtained results were contradictory and opposing: a preferential pairing between the U and the S genomes was detected by C-banding, whereas theoretical models predicted random pairing. This disagreement can be explained as the result of translocations not detected with conventional chromosome staining techniques. Begona Fernandez-Calvin, Departamento de Genetica, ETSI Agronomos, Universidad Politecnica de Madrid, 28040 Madrid, SpainThe interest in the analysis of pairing in interspecific hybrids is not only intended to establish the evolutionary origin of the genomes of a polyploid, but has also practical implications in plant breeding, since it could be used to determine the possibility of introduction of alien genes from one species into another related one. This last aspect gains a special relevance in cereal crops because of their economic importance.
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