Crosses between Hordeum JubatumL. and Taeniatherum Asperum(Sim.) Nevski to Determine Genomic Relationships

Flhybrids were obtained from crosses between Hordeum jubatumL. (2n=28) and Taeniatherum asperum(Sim.) Nevski (2n=14). The F1hybrids had a chromosome complement of 2n=21 and were self‐sterile. Chromosome behavior was irregular in microsporocytes of the hybrids examined. Chromosome doubling was induced in Flhybrids by colchicine treatment and partially selffertile amphiploid intergeneric hybrids (2n=42) were produced. Cytological observations showed many micronuclei in the microspores which resulted from chromosome fragmentation during meiosis II. The F1intergeneric hybrids and amphiploid resembled the Hordeumparent more closely than Taeniatherumbut were smaller than either parent in most morphological characteristics. There was only slight evidence of a genome relationship between the two genera.