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Pedigree Background Changes in U.S. Hybrid Maize between 1980 and 2004

Pioneer Hi-Bred International, Inc., Crop Genetics Research and Product Development, DuPont Agriculture and Nutrition, 7300 NW 62nd Ave., Box 1004, Johnston, IA 50131-1004

View larger version (15K): [in this window] [in a new window]   Figure 1. Dendrogram showing associations of maize germplasm sets on the basis of pedigree founder constitution.

View larger version (26K): [in this window] [in a new window]   Figure 2. Biplot showing associations among maize germplasm sets on the basis of founder constitution.

View larger version (25K): [in this window] [in a new window]   Figure 3. Histogram showing contributions by pedigree for 104-d relative maturity or greater Pioneer maize hybrids for founders that individually contributed at least 2.5% in any period surveyed and in any germplasm set.

View larger version (23K): [in this window] [in a new window]   Figure 4. Histogram showing contributions by pedigree for 103-d relative maturity or less Pioneer maize hybrids for founders that individually contributed at least 2.5% in any period surveyed and in any germplasm set.

View larger version (20K): [in this window] [in a new window]   Figure 5. Histogram showing contributions by pedigree for public inbred maize lines cited by Darrah and Zuber (1986, Table 4) and by Mikel and Dudley (2006, Tables 3 and 4) for founders that individually contributed at least 2.5% in any period surveyed and in any germplasm set.