[RAPD analysis of the genome evolution in allopolyploid species in Aegilops].

RAPD analysis was performed by applying a set of 24 arbitrary primers to all the allopolyploids and their diploid progenitors in Aegilops L. The analysis based on 313 RAPD fragments revealed that the allopolyploids carrying D genome grouped with Ae. squarrosa (DD) in one cluster. The allopolyploids carrying U genome grouped with Ae. umbellulata (UU) in another cluster except Ae. juvenalis (DDMMUU), which grouped with Ae. squarrosa (DD). The allopolyploids did not cluster with the other diploids. The results indicated that the allopolyploids shared close relationship with Ae. squarrosa (DD) and Ae. umbellulata (UU), respectively. It proved that the D and U genomes altered relatively little from the diploid progenitors after the allopolyploids came into being, but the other genomes changed greatly.