Original Article

Heredity (1988) 60, 47–54; doi:10.1038/hdy.1988.8

Genic heterozygosity maintained by chromosomal interchanges in rye

Ana M Figueiras1, Maria T González-Jaén1, Milagros Candela1 and César Benito1

1Departamento de Genética, Facultad de Biologiá, Universidad Complutense, 28040 Madrid, Spain

Received 3 March 1987.

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Abstract

Six different rye cultivars were electrophoretically analysed. Three of them showed chromosome polymorphism for reciprocal translocations at various frequencies, while the other three were chromosomally homogeneous. The cultivars were shown to be polymorphic for isozymes at the loci Got-3, Pgm-1, Gpi-1, Acph, Mdh-1 and Mdh-2b. The results obtained seem to indicate that the frequency of polymorphic loci, heterozygosity per locus and mean heterozygosity per cultivar are higher in those cultivars having chromosomal interchanges. In the "Ailés" cultivar, plants homozygous and heterozygous for interchanges were analysed, both in open- and self-pollination. The structural heterozygotes showed a higher genic heterozygosity mainly for the Pgm-1 and Mdh-2b loci. Possible explanations of this phenomenon are discussed.

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