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- W2078334114 abstract "The development of breeding populations from two related inbreds restricts the amount of variability expected in the cross. Our objective was to determine if, as expected from an additive genetic model, genetic variance in maize ( Zea mays L.) decreases as the number of parents of the population decreases. Eight random F 2 plants derived from the same single cross were selected as parents and were selfed to form F 3 families. These F 3 families were intermated in a hierarchical manner to form populations with N = 1, 2, 4, or 8 parents. Testcross families were evaluated in four Minnesota environments in 2003. Marker heterozygosity at 62 simple sequence repeat loci decreased with N and had a near‐linear association with expected heterozygosity. Testcross genetic variance ( V TC ) generally decreased with N , although differences observed at N = 2, 4, and 8 were mostly insignificant. For grain yield, V TC was significantly higher at N = 4 than at N = 2. The V TC for grain yield at N = 4 was slightly higher than the estimate of V TC in the base population, strongly indicating a genetic variance in excess of what is predicted by an additive genetic model for a small population. Differences in testcross means were likewise inconsistent with an additive genetic model. The results imply that nonadditive gene effects in elite maize inbreds help maintain genetic variance in small populations and that using multiple parents may help sustain genetic variability in advanced cycle breeding." @default.
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- W2078334114 date "2005-11-01" @default.
- W2078334114 modified "2023-09-27" @default.
- W2078334114 title "Genetic Variation in Maize Breeding Populations with Different Numbers of Parents" @default.
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- W2078334114 doi "https://doi.org/10.2135/cropsci2005.00050" @default.
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