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How Many Parents Give the Highest Yield in Predicted Synthetic and Composite Populations of Maize?

^a Dickinson Research Extension Center, North Dakota State Univ., 1041 State Ave., Dickinson, ND 58601
^b Dep. of Plant Breeding and Genetics, Cornell Univ., Ithaca, NY 14853

View larger version (15K): [in this window] [in a new window]   Figure 1. The amount of heterosis retained in the F2 generations of synthetic varieties with various numbers of inbred parents based on Wright's (1922) equation.

View larger version (25K): [in this window] [in a new window]   Figure 2. Predicted yields of hypothetical F2 generations of maize synthetic populations formed with different numbers of inbred lines. All yields are standardized to percent yield of the highest-yielding single cross within each study.

View larger version (30K): [in this window] [in a new window]   Figure 3. Predicted yields of hypothetical F2 generations of maize composite populations formed with different numbers of populations. All yields are standardized to percent yield of the highest-yielding population cross within each study.