In addition to an existing core map for diploid roses which comprised 305 molecular markers 60 additional markers were mapped to extend the map. As a first application of the information contained in the map, the map position of a resistance gene from roses, Rdr1, was determined by identifying closely linked markers on linkage group 1. Furthermore 21 microsatellite markers could be assigned to six of the seven linkage groups, therefore allowing their more efficient use in variety fingerprinting and general mapping in the near future. Apart from being a useful tool for genetic studies and map based cloning, the map could also be used in projects on the chromosome evolution within the rosaceae family.
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