Hordeum vulgare * Triticum aestivum hybrids.

Three Hordeum vulgare×Triticum aestivum hybrids are described. The phenotypic expression of the hybrids was similar to T. aestivum. The overall mean chromosome association in the hybrids was 24.3I+1.33II (rods), +0.38II(rings)+0.15III+0.03IV+0.003VI with a 2.57 mean chiasma frequency per cell. Early pollinations of the hybrids, before stigma receptivity was evident, with respective T. aestivum cultivars, followed eight and 32 hours later by gibberellic acid (75 ppm aqueous) treatment into the floret cups yielded first backcross (BC1) seed set. The plants that resulted after embryo culture ranged in chromosome numbers from 27 to 50. Similar early pollinations of the BC1 plants with T, aestivum, coupled with two post-pollination applications of gibberellic acid after eight and 32 hours produced over 100 BC2 seeds. All BC2 plants remained self-sterile.