Effects of Parental Embryo and Endosperm Mitotic Cycle Times on Development of Hybrids Between Barley and Rye

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Abstract
Seven different barley/rye crosses were made using genotypes having close (predicted compatible) or dissimilar (predicted incompatible) mean cell doubling times. The relative success of the crosses was determined by a cytological study of early hybrid seed development and by the yield of 16-day-old hybrid embryos. The results support the hypothesis that parental developmental rates must be similar for successful hybridization. The degeneration of the hybrid endosperm occurred earlier in the predicted incompatible crosses than in the more compatible ones. Fewer hybrid embryos were harvested at day 16 from predicted incompatible crosses than from compatible crosses. We conclude that development of hybrid embryos depends on the early stages of endosperm development and that mitotic rates in parental endosperms are more important than in embryos.

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