Abstract
Genome-wide association studies (GWAS) are useful to facilitate crop improvement via enhanced knowledge of marker-trait associations (MTA). A GWAS for grain yield (GY), yield components, and agronomic traits was conducted using a diverse panel of 239 soft red winter wheat (Triticum aestivum) genotypes evaluated across two growing seasons and eight site-years. Analysis of variance showed significant environment, genotype, and genotype-by-environment effects for GY and yield components. Narrow sense heritability of GY (h 2 = 0.48) was moderate compared to other traits including plant height (h 2 = 0.81) and kernel weight (h 2 = 0.77). There were 112 significant MTA (p < 0.0005) detected for eight measured traits using compressed mixed linear models and 5715 single nucleotide polymorphism markers. MTA for GY and agronomic traits coincided with previously reported QTL for winter and spring wheat. Highly significant MTA for GY showed an overall negative allelic effect for the minor allele, indicating selection against these alleles by breeders. Markers associated with multiple traits observed on chromosomes 1A, 2D, 3B, and 4B with positive minor effects serve as potential targets for marker assisted breeding to select for improvement of GY and related traits. Following marker validation, these multi-trait loci have the potential to be utilized for MAS to improve GY and adaptation of soft red winter wheat.
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This research was supported by the Agriculture and Food Research Initiative (AFRI) of the US Department of Agriculture’s National Institute of Food and Agriculture (USDA-NIFA) Grant 2012-67013-19436, the Monsanto Beachell-Borlaug International Scholars Program (MBBISP), and the National Research Initiative Competitive Grants 2011-68002-30029 and 2017-67007-25939 from USDA-NIFA.
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Lozada, D.N., Mason, R.E., Babar, M.A. et al. Association mapping reveals loci associated with multiple traits that affect grain yield and adaptation in soft winter wheat. Euphytica 213, 222 (2017). https://doi.org/10.1007/s10681-017-2005-2
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DOI: https://doi.org/10.1007/s10681-017-2005-2