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Assessing the sensitivities of genomic selection for growth and wood quality traits in lodgepole pine using Bayesian models

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Abstract

Genomic selection is an attractive option to complement the existing investments of the lodgepole pine (Pinus contorta Douglas) breeding program in British Columbia, Canada. There were two cycles of progeny testing established from 1984 to 2006 connected by full- and half-sib family structure that span a diverse range of ecosystems and climates. The relationship structure across the program is ideal for genomic selection, but it is unclear how genomic selection models will perform using a fixed content array with 51,213 single-nucleotide polymorphism (SNP) markers and different amounts of relatedness between the training and selection populations, across testing cycles of different ages, and across environments for growth and wood quality traits. Through cross-validation, we compared the sensitivity of genomic selection using two Bayesian models (Bayes B and C) with best linear unbiased prediction (BLUP) using a realized relationship matrix (GBLUP) and a pedigree (ABLUP). GEBVs from GBLUP were used to approximate the true breeding value for comparing models. Prediction accuracy was very high when there was relatedness between the training and validation populations (0.81 for Bayes C and 0.83 for GBLUP), but dropped considerably when relatedness was removed (0.27 for Bayes C and 0.29 for GBLUP). Prediction accuracy was high when predicting between test cycles and was highest when older first-cycle progeny tests were used to predict for younger trees in second-cycle tests (0.68 for Bayes C). Marker-based (Bayesian) and relationship-based (GBLUP) genomic selection models performed well and should be considered as a tool to complement the lodgepole pine breeding program in British Columbia.

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Data archiving statement

All raw SNP data will be submitted to dbSNP on the public website hosted by National Cancer for Biotechnology Information (NCBI) National Cancer for Biotechnology Information (NCBI): http://www.ncbi.nlm.nih.gov/SNP, where submitted SNPs can be downloaded via anonymous FTP at ftp://ncbi.nlm.nih.gov/snp/.

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Correspondence to Shawn D. Mansfield.

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Communicated by J. Beaulieu

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Ukrainetz, N.K., Mansfield, S.D. Assessing the sensitivities of genomic selection for growth and wood quality traits in lodgepole pine using Bayesian models. Tree Genetics & Genomes 16, 14 (2020). https://doi.org/10.1007/s11295-019-1404-z

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  • DOI: https://doi.org/10.1007/s11295-019-1404-z

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