Abstract
FHB resistance QTL alleles from Nyuubai, Sumai-3, and Wuhan-1 were evaluated for their effect on Fusarium head blight (FHB) index, Fusarium damaged kernels (FDK), deoxynivalenol (DON) accumulation, plant height, anthesis date, and numerous grain quality traits in three elite Canadian spring wheat backgrounds. The three FHB resistance parameters were negatively correlated with plant height in the three populations. The Wuhan-1 4B resistance allele was the most effective resistance allele but was associated with a 9.3 cm increase in plant height. The Wuhan-1 2D, Nyuubai 3BSc, Sumai-3 3BSc, Nyuubai 5AS, and Sumai-3 5AS alleles were also effective FHB resistance alleles in these populations. The Nyuubai and Sumai-3 3BS alleles were the least effective of the FHB resistance alleles in the FHB nursery tests. The Sumai-3 5AS resistance allele was significantly associated with reduced grain protein content, while the same trend was observed for the Nyuubai 5AS resistance allele but was not significant. FHB resistance tended to increase with more FHB resistance alleles introgressed into the elite genetic background, which suggested that marker-assisted selection (MAS) will prove useful for improving FHB resistance in Canadian germplasm.
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