Haploids From Barley × Rye Crosses

Haploids of barley (Hordeum vulgare L. emend. Lam.) were recovered at a frequency of less than 1% from pollinations of five strains of barley with the diploid rye cv. Prolific. This is the first report of barley haploids obtained from barley × rye crosses. Preliminary studies suggest that haploids arose through a process of elimination of rye chromatin. At metaphase I in the haploids a small degree of nonhomologous pairing expressed as bivalents and trivalents or secondary associations was observed.