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Genome-wide association studies for yield component traits in a macadamia breeding population

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O’Connor, K. M., Hayes, B., Hardner, C., Nock, C., Baten, A., Alam, M., Henry, R. and Topp, B. (2020) Genome-wide association studies for yield component traits in a macadamia breeding population. BMC Genomics, 21 (1). p. 199. ISSN 1471-2164

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Article Link(s): https://doi.org/10.1186/s12864-020-6575-3

Abstract

Breeding for new macadamia cultivars with high nut yield is expensive in terms of time, labour and cost. Most trees set nuts after four to five years, and candidate varieties for breeding are evaluated for at least eight years for various traits. Genome-wide association studies (GWAS) are promising methods to reduce evaluation and selection cycles by identifying genetic markers linked with key traits, potentially enabling early selection through marker-assisted selection. This study used 295 progeny from 32 full-sib families and 29 parents (18 phenotyped) which were planted across four sites, with each tree genotyped for 4113 SNPs. ASReml-R was used to perform association analyses with linear mixed models including a genomic relationship matrix to account for population structure. Traits investigated were: nut weight (NW), kernel weight (KW), kernel recovery (KR), percentage of whole kernels (WK), tree trunk circumference (TC), percentage of racemes that survived from flowering through to nut set, and number of nuts per raceme.

Item Type:Article
Business groups:Horticulture and Forestry Science
Subjects:Science > Botany > Genetics
Agriculture > Agriculture (General) > Methods and systems of culture. Cropping systems
Plant culture > Seeds. Seed technology
Plant culture > Propagation
Plant culture > Fruit and fruit culture > Nuts
Deposited On:26 Aug 2020 07:11
Last Modified:14 Sep 2020 01:52

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