JOINT USE OF PHENOTYPIC, PEDIGREE AND GENOMIC INFORMATION IN GENETIC EVALUATION: AN EXAMPLE IN EUCALYPTUS GRANDIS.

EDUARDO P. CAPPA; YOUSRY A. EL-KASSABY; MARTÍN N. GARCÍA; PAMELA V. VILLALBA; JAROSLAV KLÁPTSTE; SUSANA N. MARCUCCI POLTRI

Praga, República Checa

Conferencia; IUFRO Forest Tree Breeding Conference 2014; 2014

Forest tree breeding populations are usually large, with hundreds of progenies from many mother trees. Genotyping costs are thus the main obstacle for the successfully large-scale implementation of genomic selection (GS). A more realistic scenario would include only one sub-set of genotyped trees and fewer genetic markers per sample to obtain the marked-based relationship matrix. Then, the classical pedigree-based relationship matrix could be replaced by the H matrix (e.g. Legarra et al. 2009) that combines two types of genetic information: 1) pedigree information (A matrix) for a group of non-genotyped individuals and 2) marked-based relationship (G matrix) for an additional group of genotyped individuals. This combined approach is appealing as it produces more precise predicted breeding values than those of the pedigree-based counterpart. However, the potential advantage of the combined approach over the classical pedigree-based selection remains uncertain in forest genetic evaluations.