Improving accuracy of breeding values by incorporating genomic information in spatial-competition mixed models

Molecular Breeding - Tập 37 - Trang 1-13 - 2017
Eduardo P. Cappa1,2, Yousry A. El-Kassaby3, Facundo Muñoz4, Martín N. Garcia5, Pamela V. Villalba5, Jaroslav Klápště3,6, Susana N. Marcucci Poltri5
1Instituto de Recursos Biológicos (IRB), Centro de Investigación en Recursos Naturales (CIRN), Instituto Nacional de Tecnología Agropecuaria (INTA), 1686 Hurlingham, Argentina
2Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
3Department of Forest and Conservation Sciences, Faculty of Forestry, The University of British Columbia, Vancouver, Canada
4Unité Amélioration, Génétique et Physiologie Forestières (UR UGPF), Institut National de la Recherche Agronomique (INRA), Ardon, France
5Instituto de Biotecnología (IB), Centro de Investigación en Ciencias Veterinarias y Agronómicas (CICVyA), Instituto Nacional de Tecnología Agropecuaria (INTA), 1686 Hurlingham, Argentina
6Department of Genetics and Physiology of Forest Trees, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague 6, Czech Republic

Tóm tắt

Climate change and the increasing demand for sustainable energy resources require urgent strategies to increase the accuracy of selection in tree breeding (associated with higher gain). We investigated the combined pedigree and genomic-based relationship approach and its impact on the accuracy of predicted breeding values using data from 5-year-old Eucalyptus grandis progeny trial. The number of trees that can be genotyped in a tree breeding population is limited; therefore, the combined approach can be a feasible and efficient strategy to increase the genetic gain and provide more accurate predicted breeding values. We calculated the accuracy of predicted breeding values for two growth traits, diameter at breast height and total height, using two evaluation approaches: the combined approach and the classical pedigree-based approach. We also investigated the influence of two different trait heritabilities as well as the inclusion of competition genetic effects or environmental heterogeneity in an individual-tree mixed model on the estimated variance components and accuracy of breeding values. The genomic information of genotyped trees is automatically propagated to all trees with the combined approach, including the non-genotyped mothers. This increased the accuracy of overall breeding values, except for the non-genotyped trees from the competition model. The increase in the accuracy was higher for the total height, the trait with low heritability. The combined approach is a simple, fast, and accurate genomic selection method for genetic evaluation of growth traits in E. grandis and tree species in general. It is simple to implement in a traditional individual-tree mixed model and provides an easy extension to individual-tree mixed models with competition effects and/or environmental heterogeneity.

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Molecular Breeding

Tập 37

1-13

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