Chromosomal location of 46 new RAPD markers in rye (Secale cereale L.)

The polymerase chain reaction (PCR) was used to locate RAPD markers using disomic wheat-rye addition lines in order to develop a set of molecular markers distributed on the seven rye chromosomes. We carried out RAPD amplifications on genomic DNA of wheat 'Chinese Spring' (CS), rye 'Imperial' (I), the amphiploid wheat-rye and the seven disomic wheat-rye addition lines (1R-7R) using 140 different 10-mer oligonucleotides. Forty six new RAPD markers were located on the seven rye chromosomes and all the disomic wheat-rye addition lines were identified on the basis of their amplification patterns. The number of RAPD bands located on 1R, 2R, 3R, 4R, 5R, 6R and 7R chromosomes were 5, 8, 11, 8, 8, 10 and 6, respectively. The seven wheat-rye addition lines can be distinguished using only the following three 10-mer oligonucleotides: OPA16, OPF19 and GEN3-605, the other RAPD primers being useful for this purpose. The use of these RAPDs as a source of molecular markers that could be linked to interesting genes or other important agronomic traits is discussed.