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Re-examining the Relationship between Degree of Relatedness, Genetic Effects, and Heterosis in Maize

Dep. of Plant Agriculture, Crop Science Bldg., Univ. of Guelph, Guelph, ON, Canada, N1G 2W1. Financial support, in part, from the Ontario Ministry of Agriculture and Food, Natural Science and Engineering Research Council, Canadian Foundation for Innovation, Ontario Innovative Trust, and Ontario Corn Producers' Association.

View larger version (12K): [in this window] [in a new window]   Figure 1. Relationship between the identity-by-descent (IBD) estimates for sister-line inbred line pairs and heterosis (%) for grain yield observed in the sister-line hybrids, involving sister lines from three families: Family 3920 lines; Family 3790 lines; Family 3929 lines.

View larger version (10K): [in this window] [in a new window]   Figure 2. Relationship between midparent grain yield (Mg ha–1) for sister-line inbred line pairs and hybrid grain yield (Mg ha–1) observed in the sister-line hybrids, involving sister lines from three families: Family 3920 lines; Family 3790 lines; Family 3929 lines. Grain yields were averaged across five environments.