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Originally published as Genetics Published Articles Ahead of Print on May 16, 2007.
Genetics, Vol. 176, 1931-1934, July 2007, Copyright © 2007
doi:10.1534/genetics.107.074146
Impact of Interpopulation Divergence on Additive and Dominance Variance in Hybrid Populations
J. C. Reif*,
F.-M. Gumpert*,
S. Fischer
and
A. E. Melchinger*,1
* Institute of Plant Breeding, Seed Science, and Population Genetics and State Plant Breeding Institute, University of Hohenheim, 70593 Stuttgart, Germany
1 Corresponding author: Institute of Plant Breeding, Seed Science, and Population Genetics, University of Hohenheim, Fruwirthstrasse. 21, 70593 Stuttgart, Germany.
E-mail: melchinger{at}uni-hohenheim.de
We present a theoretical proof that the ratio of the dominance vs. the additive variance decreases with increasing genetic divergence between two populations. While the dominance variance is the major component of the variance due to specific combining ability (
), the additive variance is the major component of the variance due to general combining ability (
). Therefore, we conclude that interpopulation improvement becomes more efficient with divergent than with genetically similar heterotic groups, because performance of superior hybrids can be predicted on the basis of general combining ability effects.