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Breeding Line Selection Based on Multiple Traits

Eastern Cereal and Oilseed Research Centre (ECORC), Agriculture and Agri-Food Canada (AAFC), Neatby Building, 960 Carling Ave., Ottawa, ON, Canada, K1A 0C6

View larger version (87K): [in this window] [in a new window]   Figure 1. The multitrait selection interface that combines independent selection, independent culling, and index selection. The data were first scaled to [0, 1] range (0 for minimum and 1 for maximum) for each trait before the selections were applied. The weights for protein, oil, groat, and beta-glucan were set to 0.3, –0.5, 1.0, and 0.5, respectively. Single trait selection rate for the checked traits was 10% of the trait ranges adjusted by their respective weights. Single trait cutting rate was 30% of the trait ranges adjusted by their weights. Overall cutting rate based on selection index was 50% of the entries. All traits were selected for high levels, while oil and beta-glucan were also selected for low levels.

View larger version (27K): [in this window] [in a new window]   Figure 2. The genotype by trait (GT) biplot of 150 covered oat genotypes for four quality traits. The traits are groat content and oil, protein, and beta-glucan (BGLUCAN) concentrations in the groat.

View larger version (20K): [in this window] [in a new window]   Figure 3. The same genotype by trait (GT) biplot as Fig. 2 modified to show the trait profiles of the selected vs. discarded genotypes based on the comprehensive selection scheme (1 for genotypes selected and 0 for genotypes discarded based on the comprehensive selection scheme). BGLUCAN, beta-glucan; SVP, singular value partitioning method.

View larger version (14K): [in this window] [in a new window]   Figure 4. Genotype by trait (GT) biplot of 10 genotypes with extreme trait profiles. BGLUCAN, beta-glucan.

View larger version (19K): [in this window] [in a new window]   Figure 5. Genotype by trait (GT) biplot of 140 genotypes with less extreme trait profiles (1 for genotypes selected and 0 for genotypes discarded based on the comprehensive selection scheme). BGLUCAN, beta-glucan.