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Population Genetic Diversity in a Maize Reciprocal Recurrent Selection Program

^a USDA-ARS, Crop Germplasm Research Unit, Texas A&M Univ., College Station, TX 77845
^b Institute for Genomic Diversity, Cornell Univ., Ithaca, NY 14853
^c Dep. of Ecology, Evolution, & Organismal Biology, Iowa State Univ., Ames, IA 50011
^d Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

View larger version (42K): [in a new window]   Fig. 1. Genetic variation of 86 SSR loci in Iowa Corn Borer Synthetic #1 (CB) and Iowa Stiff Stalk Synthetic (SS) calculated for each group in each population. Dashed vertical line indicates change when 20 selections (N), instead of 10, were chosen from Cycle 8 to form Cycle 9. (a). Percentage polymorphic loci. (b). Average number of alleles per locus. (c). Expected heterozygosity.

View larger version (10K): [in a new window]   Fig. 2. Percentage of 86 SSR loci deviating from Hardy-Weinberg Equilibrium in Iowa Corn Borer Synthetic #1 (CB) and Iowa Stiff Stalk Synthetic (SS) calculated for each group in each population. Dashed vertical line indicates change when 20 selections (N), instead of 10, were chosen from Cycle 8 to form Cycle 9.

View larger version (26K): [in a new window]   Fig. 3. Principal component analysis for the progenitor lines and cycles of selection in Iowa Corn Borer Synthetic #1 (CB) and Iowa Stiff Stalk Synthetic (SS) based on 86 SSR loci. The first two principal components (PC1 and PC2) are plotted against each other with the amount of variation explained by each in parenthesis.