Implementation of the Realized Genomic Relationship Matrix to Open-Pollinated White Spruce Family Testing for Disentangling Additive from Nonadditive Genetic Effects

G3 : Genes - Genomes - Genetics
Omnia Gamal El-DienYousry A El-Kassaby

Abstract

The open-pollinated (OP) family testing combines the simplest known progeny evaluation and quantitative genetics analyses as candidates' offspring are assumed to represent independent half-sib families. The accuracy of genetic parameter estimates is often questioned as the assumption of "half-sibling" in OP families may often be violated. We compared the pedigree- vs. marker-based genetic models by analysing 22-yr height and 30-yr wood density for 214 white spruce [Picea glauca (Moench) Voss] OP families represented by 1694 individuals growing on one site in Quebec, Canada. Assuming half-sibling, the pedigree-based model was limited to estimating the additive genetic variances which, in turn, were grossly overestimated as they were confounded by very minor dominance and major additive-by-additive epistatic genetic variances. In contrast, the implemented genomic pairwise realized relationship models allowed the disentanglement of additive from all nonadditive factors through genetic variance decomposition. The marker-based models produced more realistic narrow-sense heritability estimates and, for the first time, allowed estimating the dominance and epistatic genetic variances from OP testing. In addition, the genomic models sho...Continue Reading

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Citations

Jan 27, 2017·G3 : Genes - Genomes - Genetics·Blaise RatcliffeYousry A El-Kassaby
Nov 3, 2017·Frontiers in Plant Science·Milan LstibůrekArne Steffenrem
Oct 21, 2017·Trends in Ecology & Evolution·Phillip GienappKatalin Csilléry

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AE
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