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Genetic Diversity of Weedy Rye Populations in California¹

Eight populations of weedy rye, Secale spp., from the Cascade range counties in northern California were scored for characters describing the wild and cultivated gene complexes. The relative frequencies of individuals with non fragile rachis, short awn, blue aleurone, and bronze lemma represent the postulated gene flow by introgression from cultivars into the original Secale montanum Guss. x S. cereale L. hybrids giving rise to the present genetic diversity and geographical patterns of variation in weedy rye. Although characters representing the wild and cultivated forms are not associated into distinct gene complexes, the weedy rye populations have a varied mixture of them. This confirms an earlier report on the origin of weedy rye and suggests continuing genetic shifts in weedy rye toward the cultivated forms.

Key Words: Crop evoulution • Genetic variability • Crop-weed complexes • Introgression • Secale spp.

² Professor, Dep. of Agronomy and Range Science, Univ. of California, Davis.

Received for publication September 27, 1976.