An intervarietal molecular marker map in Triticum aestivum L em Thell and comparison with a map from a wide cross

An intervarietal molecular marker map covering most of the nuclear genome was developed in Triticum aestivum. One hundred and six androgenetic-derived doubled haploid lines obtained from the F-1 between monosomics of 'Chinese Spring' and 'Courtot' were analysed for genetic mapping. The map covered 18 of the 21 chromosomes with an identical distribution of markers in the A and B genome, and only small segments of the D genome. Distorted markers were mapped using Bailey's 2-point method and revealed skewed regions on 1A, 1DS, 2A, 2B, 4AS and 6B. Comparison with a wide cross ['Opata' x Synthetic hexaploid (T. tauschii/'Altar 84')] showed colinearity for markers on homologous chromosomes, but revealed a large proportion (25%) of markers mapped on non-homoeologous chromosomes, i.e. heterologous markers. The origin of the material and distortion segregation are discussed with particular emphasis on investigations of D-genome markers.