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Genomic selection and genetic gain for nut yield in an Australian macadamia breeding population

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O'Connor, K. M., Hayes, B. J., Hardner, C. M., Alam, M., Henry, R. J. and Topp, B. L. (2021) Genomic selection and genetic gain for nut yield in an Australian macadamia breeding population. BMC Genomics, 22 (1). p. 370. ISSN 1471-2164


Article Link: https://doi.org/10.1186/s12864-021-07694-z


Improving yield prediction and selection efficiency is critical for tree breeding. This is vital for macadamia trees with the time from crossing to production of new cultivars being almost a quarter of a century. Genomic selection (GS) is a useful tool in plant breeding, particularly with perennial trees, contributing to an increased rate of genetic gain and reducing the length of the breeding cycle. We investigated the potential of using GS methods to increase genetic gain and accelerate selection efficiency in the Australian macadamia breeding program with comparison to traditional breeding methods. This study evaluated the prediction accuracy of GS in a macadamia breeding population of 295 full-sib progeny from 32 families (29 parents, reciprocals combined), along with a subset of parents. Historical yield data for tree ages 5 to 8 years were used in the study, along with a set of 4113 SNP markers. The traits of focus were average nut yield from tree ages 5 to 8 years and yield stability, measured as the standard deviation of yield over these 4 years. GBLUP GS models were used to obtain genomic estimated breeding values for each genotype, with a five-fold cross-validation method and two techniques: prediction across related populations and prediction across unrelated populations.

Item Type:Article
Business groups:Horticulture and Forestry Science
Keywords:Horticulture Plant breeding Genome-based prediction Phenotype Fruit tree
Subjects:Science > Botany > Genetics
Agriculture > Agriculture (General) > Methods and systems of culture. Cropping systems
Plant culture > Seeds. Seed technology
Plant culture > Food crops
Plant culture > Fruit and fruit culture > Nuts
Live Archive:06 Jun 2021 23:46
Last Modified:19 Jan 2024 00:24

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