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Maize genotypes used during this study.
| Genotype | Heterotic Group | Decade |
| B14* | Iowa Stiff Stalk | 1950s |
| B73 | Iowa Stiff Stalk | 1970s |
| PHJ40 | Iowa Stiff Stalk | 1980s |
| OH43 | Non-Stiff Stalk | 1940s |
| Pa91 | Non-Stiff Stalk | 1970s |
| PHG84 | Non-Stiff Stalk | 1980s |
Asterisk denotes genotypes which had insufficient germination and were removed from all analyses.
