Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/56315
Title: Optimal Contribution Selection Improves the Rate of Genetic Gain in Grain Yield and Yield Stability in Spring Canola in Australia and Canada
Contributor(s): Cowling, Wallace A (author); Castro-Urrea, Felipe A (author); Stefanova, Katia T (author); Li, Li  (author)orcid ; Banks, Robert G  (author)orcid ; Saradadevi, Renu (author); Sass, Olaf (author); Kinghorn, Brian P  (author)orcid ; Siddique, Kadambot H M (author)
Publication Date: 2023-01-13
Open Access: Yes
DOI: 10.3390/plants12020383
Handle Link: https://hdl.handle.net/1959.11/56315
Abstract: 

Crop breeding must achieve higher rates of genetic gain in grain yield (GY) and yield stability to meet future food demands in a changing climate. Optimal contributions selection (OCS) based on an index of key economic traits should increase the rate of genetic gain while minimising population inbreeding. Here we apply OCS in a global spring oilseed rape (canola) breeding program during three cycles of S0,1 family selection in 2016, 2018, and 2020, with several field trials per cycle in Australia and Canada. Economic weights in the index promoted high GY, seed oil, protein in meal, and Phoma stem canker (blackleg) disease resistance while maintaining plant height, flowering time, oleic acid, and seed size and decreasing glucosinolate content. After factor analytic modelling of the genotype-by-environment interaction for the additive effects, the linear rate of genetic gain in GY across cycles was 0.059 or 0.087 t ha−1 y−1 (2.9% or 4.3% y−1) based on genotype scores for the first factor (f1) expressed in trait units or average predicted breeding values across environments, respectively. Both GY and yield stability, defined as the root-mean-square deviation from the regression line associated with f1, were predicted to improve in the next cycle with a low achieved mean parental coancestry (0.087). These methods achieved rapid genetic gain in GY and other traits and are predicted to improve yield stability across global spring canola environments.

Publication Type: Journal Article
Source of Publication: Plants, 12(2), p. 1-27
Publisher: MDPI AG
Place of Publication: Switzerland
ISSN: 2223-7747
Fields of Research (FoR) 2020: 300406 Crop and pasture improvement (incl. selection and breeding)
Socio-Economic Objective (SEO) 2020: 280101 Expanding knowledge in the agricultural, food and veterinary sciences
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Journal Article
School of Environmental and Rural Science

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