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

F_l hybrids were obtained Erom crosses between Hordeum jubatum L. (2n=28) and Taeniatherum asperum (Sim.) Nevski (2n=14). The F₁ hybrids 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 F_l hybrids 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 11.

The F₁ intergeneric hybrids and amphiploid resembled the Hordeum parent more closely than Taeniatherum but were smaller than either parent in most morphological characteristics. There was only slight evidence of a genome relationship between the two genera.

² Associate Professor, Instructor, and Professor, respectively, Department of Agronomy, North Dakota State University, Fargo, 58102.

Received for publication January 3, 1972.