A detailed linkage map ofB. rapa (syn.campestris) was constructed based on segregation of 280 restriction fragment length polymorphism loci, detected by using 188 genomic DNA clones as probes on DNAs from a F2 population of Chinese cabbage 'MichihilF'×'Spring broccoli.' These genetic markers covered 1,850 centiMorgans (cM) and defined ten linkage groups, which equals the haploid chromosome number of this species. Extensive sequence duplication was evident by the detection of two or more segregating loci with each of 69 clones (36.7% of the total). Although some duplicated loci were randomly distributed throughout the genome, many had linkage arrangements that were conserved on different linkage groups, suggesting that large chromosome fragments were present in multiple copies. However, conservation in the linkage arrangement of duplicate loci throughout entire pairs of linkage groups was not observed. Single-copy loci were often found to be located within conserved duplicated regions, and linkage distances between some loci having conserved duplicated arrangements were substantially different between the duplicated regions. Structural rearrangements, such as insertions, deletions, and inversions or combinations of these events, seemed to be related to the alternations of map distances between duplicated loci and to the dispersal of duplicated chromosome fragments. These results suggest thatB. rapa has evolved in part by duplication of chromosomes or large chromosome fragments with subsequent structural rearrangements.
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