CYTOGENETIC ANALYSIS OF 3 HORDEUM X ELYMUS HYBRIDS

Meiotic chromosome pairing in three Hordeum x Elymus hybrids was analy zed. Hybrid plants of H. jubatum (HHHH) x E. canadensis (SSHH) showed a low level of chromosome pairing, but the observation of trivalents i ndicated the presence of three H genomes as expected. In the hybrid pl ants of N. parodii (HHHHHH) x E. canadensis (SSHH), the level of chrom osome pairing was rather low, but up to three trivalents per pollen mo ther cell could be detected rather infrequently. In the progeny of H. parodii (HHHHHH) x E. scabriglumis (SSHH??), chromosome pairing was qu ite frequent with the occasional occurrence of quadrivalents and penta valents. This can be explained if the genomic constitution of E. scabr iglumis is assumed to be SSHHHH.