Abstract
Fusarium head blight (FHB) is one of the most devastating wheat disease due to its direct detrimental effects on grain-yield, quality and marketability. Resistant cultivars offer the most effective approach to manage FHB; however, the lack of different resistance resources is still a major bottleneck for wheat breeding programs. To identify and dissect FHB resistance, a doubled haploid wheat population produced from the Canadian spring wheat cvs AAC Innova and AAC Tenacious was phenotyped for FHB response variables incidence and severity, visual rating index (VRI), deoxynivalenol (DON) content, and agronomic traits days to anthesis (DTA) and plant height (PHT), followed by single nucleotide polymorphism (SNP) and simple sequence repeat (SSR) marker genotyping. A high-density map was constructed consisting of 10,328 markers, mapped on all 21 chromosomes with a map density of 0.35 cM/marker. Together, two major quantitative trait loci for FHB resistance were identified on chromosome 2D from AAC Tenacious; one of these loci on 2DS also colocated with loci for DTA and PHT. Another major locus for PHT, which cosegregates with locus for low DON, was also identified along with many minor and epistatic loci. QTL identified from AAC Tenacious may be useful to pyramid FHB resistance.
Highlights
Fusarium head blight (FHB), caused by Fusarium graminearum (Schwabe) (Fg) and another ~17 [1] species of the genus Fusarium, is one of the most devastating wheat diseases in the world due to its detrimental effects on grain-yield, quality and marketability
Associations between FHB resistance and a number of other traits such as days to anthesis (DTA) and plant height (PHT) [7,11–16] further complicate the genetics of FHB resistance which are controlled by polygenes/quantitative trait loci (QTL) that predominantly manifest in small additive effects and high genotype x environment interactions [17–20]
This study provides new insights into the genetic basis of the FHB resistance of wheat cv AAC Tenacious, which is the first Canadian spring wheat cv to obtain a FHB ‘resistant’ rating
Summary
Fusarium head blight (FHB), caused by Fusarium graminearum (Schwabe) (Fg) and another ~17 [1] species of the genus Fusarium, is one of the most devastating wheat diseases in the world due to its detrimental effects on grain-yield, quality and marketability. A few FHB-resistant QTL, such as Fhb1 [22], Fhb2 [23,24] and Fhb5 [25], respectively on chromosome arms 3BS, 6BS, and 5AS, are the most-characterized and used QTL in breeding programs These loci possess relatively large additive effects, and are sometimes treated as discrete loci. Fhb and Fhb have been fine mapped [26–29] Another reported prominent resistance QTL is on chromosome arm 2DL, initially detected from a Chinese breeding line ‘Wuhan-1 [16]. A number of small-effect FHB resistance loci have been detected from several north American and European wheat cvs and mapped to different chromosomes [19,33]. In addition to resistance QTL, a number of susceptibility factors have been identified from Sumai 3 [34–36] and Chinese Spring [37]
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