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What If We Knew All the Genes for a Quantitative Trait in Hybrid Crops?

Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, 411 Borlaug Hall, 1991 Buford Circle, St. Paul, MN 55108-6026

View larger version (21K): [in a new window]   Fig. 1. Gain or loss in efficiency (%) of selection based on gene information compared with phenotypic selection. Trait heritability (h2) was 0.20 (diamond), 0.50 (circle), and 0.80 (triangle). Selection was among untested single-cross hybrids or among recombinant inbreds, with different numbers of loci (l) and tested hybrids (n) from which gene effects were estimated. (A) Hybrids, , . (B) Inbreds, . (C) Hybrids, . (D) Hybrids, . (E) Hybrids, . (F) Inbreds,

View larger version (31K): [in a new window]   Fig. 2. Variability in the estimates of gene effects at Locus 1. Gene effects were expressed in terms of three orthogonal contrasts for the: testcross additive effect of Group 1 alleles (diamond); testcross additive effect of Group 2 alleles (circle); and dominance effect (triangle). The trait was controlled by 10 or 100 loci, of which 10% were known. Trait heritability was 20% and gene effects were estimated from 2000 tested hybrids