RFLP MAPS OF RYE CHROMOSOMES 6R AND 7R INCLUDING TERMINAL C-BANDS

A F-2 mapping population was created from a cross between 'UC-90' and E-line ryes (Secale cereale L.), two lines that showed polymorphism fo r eight C-band loci. Clones from rye, as well as other grasses, were u sed as probes. RFLP maps of rye chromosomes 6R and 7R were generated t hat include the 6RS and 6RL terminal C-bands and the 7RS terminal C-ba nd. The 6R map spans 230 cM and includes 9 loci. The 7R map covers 225 cM and includes 21 loci. Segregation distortion was detected for seve ral chromosomal regions. Heterochromatic C-bands did not appear to be responsible for the distortion.