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A random sample of nine inbred (S8) rye lines (Secale cereale L.) exhibited significant differences in crossability with several wheat (Triticum aestivum L.) lines. Results obtained from crosses among selected wheat and rye lines indicate that the crossability system in rye may interact with the Kr loci controlling intergeneric crossability in wheat. Certain rye lines are capable of partially circumventing one or both of the known crossability inhibitor genes in homozygous wheat lines. Crossability in rye appears to be simply inherited with high crossability being dominant.

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