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Absence of Epistasis for Grain Yield in Elite Maize Hybrids

^a Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
^b USDA-ARS, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

View larger version (27K): [in a new window]   Fig. 1. Fitting Model 1 and Model 2 to the generation means for each B73 testcross progeny set. Testcross grain yield (Mg ha-1) is plotted against the percentage of Parent 1 in the cross. Figure captions are in the form: (P1 x P2) * tester. Solid squares = observed grain yield with 95% confidence intervals; dashed line = Model 1 (linkage—no epistasis); solid line = Model 2 (epistasis—no linkage).

View larger version (29K): [in a new window]   Fig. 2. Fitting Model 1 and Model 2 to the generation means in each B104 testcross progeny set. Testcross grain yield (Mg ha-1) is plotted against the percentage of Parent 1 in the cross. Figure captions are in the form: (P1 x P2) * tester. Solid squares = observed grain yield with 95% confidence intervals; dashed line = Model 1 (linkage—no epistasis); solid line = Model 2 (epistasis—no linkage).

View larger version (27K): [in a new window]   Fig. 3. Fitting Model 1 and Model 2 to the generation means in each B97 testcross progeny set. Testcross grain yield (Mg ha-1) is plotted against the percentage of Parent 1 in the cross. Figure captions are in the form: (P1 x P2) * tester. Solid squares = observed grain yield with 95% confidence intervals; dashed line = Model 1 (linkage—no epistasis); solid line = Model 2 (epistasis—no linkage).

View larger version (27K): [in a new window]   Fig. 4. Fitting Model 1 and Model 2 to the generation means in each B112 testcross progeny set. Testcross grain yield (Mg ha-1) is plotted against the percentage of Parent 1 in the cross. Figure captions are in the form: (P1 x P2) * tester. Solid squares = observed grain yield with 95% confidence intervals; dashed line = Model 1 (linkage—no epistasis); solid line = Model 2 (epistasis—no linkage).