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Figure 1. Chromosomal locations and effects of quantitative trait loci for seed yield of test cross progenies detected after introgression of alleles from five unadapted donor sources of Brassica napus. Significant positive and negative effects of donor alleles on seed yield in at least one environment are indicated by smaller ellipses for discovery populations, as reported previously (Butruille et al. 1999b; Quijada et al. 2006; Udall et al. 2006). Multiple copies of chromosomes are shown if different donors contributed significant effects for that chromosome (N3, N7, N10, and N13). Results from retesting QTL alleles on N2, N3, N6, N10, and N15 in new segregating populations of the same genetic background are shown by ellipses and circles right adjacent to the first test results. Results from retesting N3 and N14 segments from Ceres in different genetic backgrounds (Quijada et al. 2004a) are shown using larger ellipses and circles right adjacent to the first test results. The range of effects of donor allele substitutions on seed yield of test cross progenies are shown numerically for retested loci. Chromosomes derived from the two diploid progenitor species, B. rapa (N1–N10) and B. oleracea (N11–N19), are indicated.
