Accounting for Genotype-by-Environment Interactions and Residual Genetic Variation in Genomic Selection for Water-Soluble Carbohydrate Concentration in Wheat.
Autor: | Ovenden B; NSW Department of Primary Industries, Yanco Agricultural Institute, Yanco NSW 2703, Australia ben.ovenden@dpi.nsw.gov.au., Milgate A; NSW Department of Primary Industries, Wagga Wagga Agricultural Institute, Wagga Wagga NSW 2650, Australia., Wade LJ; Charles Sturt University, Graham Centre, Wagga Wagga NSW 2678, Australia., Rebetzke GJ; CSIRO Agriculture and Food, Canberra, ACT 2601, Australia., Holland JB; USDA-ARS Plant Science Research Unit and North Carolina State University Department of Crop and Soil Sciences, Raleigh, NC 27695-7620. |
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Jazyk: | angličtina |
Zdroj: | G3 (Bethesda, Md.) [G3 (Bethesda)] 2018 May 31; Vol. 8 (6), pp. 1909-1919. Date of Electronic Publication: 2018 May 31. |
DOI: | 10.1534/g3.118.200038 |
Abstrakt: | Abiotic stress tolerance traits are often complex and recalcitrant targets for conventional breeding improvement in many crop species. This study evaluated the potential of genomic selection to predict water-soluble carbohydrate concentration (WSCC), an important drought tolerance trait, in wheat under field conditions. A panel of 358 varieties and breeding lines constrained for maturity was evaluated under rainfed and irrigated treatments across two locations and two years. Whole-genome marker profiles and factor analytic mixed models were used to generate genomic estimated breeding values (GEBVs) for specific environments and environment groups. Additive genetic variance was smaller than residual genetic variance for WSCC, such that genotypic values were dominated by residual genetic effects rather than additive breeding values. As a result, GEBVs were not accurate predictors of genotypic values of the extant lines, but GEBVs should be reliable selection criteria to choose parents for intermating to produce new populations. The accuracy of GEBVs for untested lines was sufficient to increase predicted genetic gain from genomic selection per unit time compared to phenotypic selection if the breeding cycle is reduced by half by the use of GEBVs in off-season generations. Further, genomic prediction accuracy depended on having phenotypic data from environments with strong correlations with target production environments to build prediction models. By combining high-density marker genotypes, stress-managed field evaluations, and mixed models that model simultaneously covariances among genotypes and covariances of complex trait performance between pairs of environments, we were able to train models with good accuracy to facilitate genetic gain from genomic selection. (Copyright © 2018 Ovenden et al.) |
Databáze: | MEDLINE |
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