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- W2131823795 abstract "In association with improved grain yield and agronomic performance of maize hybrids developed by Pioneer Hi-Bred for the central U.S. corn-belt, there have been detectable changes in the organization of ge- netic diversity. Genetic diversity was measured using 1698 Simple Sequence Repeat (SSR) markers distributed over the 10 chromosomes of maize. A subset comprising of 361 SSRs was used to assay the 88 inbred parents of a se- quence of 53 successful maize hybrids released by Pio- neer Hi-Bred from 1934 to 2004. Patterns of change in SSR allele frequencies over the history of the breeding program are complex and indicative of a large open breeding system. Many of the temporal trends for individ- ual SSR alleles over the history of the breeding program are unique and likely result from the combined influences of many factors that operated during the history of the breeding program. Both random sampling of alleles and selection within the pedigree relationships of the germplasm, from the founding ancestors to the modern inbreds, can explain some of the trends in genetic diversi- ty. In addition, new germplasm with unique genetic di- versity was introduced into the breeding effort at different times. Selection has been applied to organize the germplasm into heterotic groups with unique allele com- binations at the SSR loci and to increase the frequencies of some alleles within the heterotic groups. The modern commercial maize hybrids of today combine the diversity between the heterotic groups and enable the deployment of this diversity within the U.S. corn-belt." @default.
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- W2131823795 date "2006-01-01" @default.
- W2131823795 modified "2023-09-28" @default.
- W2131823795 title "TEMPORAL TRENDS IN SSR ALLELE FREQUENCIES ASSOCIATED WITH LONG-TERM SELECTION FOR YIELD OF MAIZE 1" @default.
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