title: QTL Characterization of Fusarium Head Blight Resistance in CIMMYT Bread Wheat Line Soru#1.
abstract: Fusarium head blight (FHB) resistant line Soru#1 was hybridized with the German cultivar Naxos to generate 131 recombinant inbred lines for QTL mapping. The population was phenotyped for FHB and associated traits in spray inoculated experiments in El Batán (Mexico), spawn inoculated experiments in Ås (Norway) and point inoculated experiments in Nanjing (China), with two field trials at each location. Genotyping was performed with the Illumina iSelect 90K SNP wheat chip, along with a few SSR and STS markers. A major QTL for FHB after spray and spawn inoculation was detected on 2DLc, explaining 15-22% of the phenotypic variation in different experiments. This QTL remained significant after correction for days to heading (DH) and plant height (PH), while another QTL for FHB detected at the Vrn-A1 locus on 5AL almost disappeared after correction for DH and PH. Minor QTL were detected on chromosomes 2AS, 2DL, 4AL, 4DS and 5DL. In point inoculated experiments, QTL on 2DS, 3AS, 4AL and 5AL were identified in single environments. The mechanism of resistance of Soru#1 to FHB was mainly of Type I for resistance to initial infection, conditioned by the major QTL on 2DLc and minor ones that often coincided with QTL for DH, PH and anther extrusion (AE). This indicates that phenological and morphological traits and flowering biology play important roles in resistance/escape of FHB. SNPs tightly linked to resistance QTL, particularly 2DLc, could be utilized in breeding programs to facilitate the transfer and selection of those QTL.
authors.affiliation: International Maize and Wheat Improvement Center (CIMMYT), Texcoco, Edo. de México, Mexico.|Department of Plant Sciences, Norwegian University of Life Sciences, Ås, Norway.
authors.forename: Xinyao
authors.initials: X
authors.lastname: He
authors.affiliation: Department of Plant Sciences, Norwegian University of Life Sciences, Ås, Norway.
authors.forename: Morten
authors.initials: M
authors.lastname: Lillemo
authors.affiliation: Jiangsu Academy of Agricultural Sciences, Nanjing, China.
authors.forename: Jianrong
authors.initials: J
authors.lastname: Shi
authors.affiliation: Jiangsu Academy of Agricultural Sciences, Nanjing, China.
authors.forename: Jirong
authors.initials: J
authors.lastname: Wu
authors.affiliation: Department of Plant Sciences, Norwegian University of Life Sciences, Ås, Norway.
authors.forename: Åsmund
authors.initials: Å
authors.lastname: Bjørnstad
authors.affiliation: Department of Plant Sciences, Norwegian University of Life Sciences, Ås, Norway.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Belova
authors.affiliation: International Maize and Wheat Improvement Center (CIMMYT), Texcoco, Edo. de México, Mexico.
authors.forename: Susanne
authors.initials: S
authors.lastname: Dreisigacker
authors.affiliation: International Maize and Wheat Improvement Center (CIMMYT), Texcoco, Edo. de México, Mexico.
authors.forename: Etienne
authors.initials: E
authors.lastname: Duveiller
authors.affiliation: International Maize and Wheat Improvement Center (CIMMYT), Texcoco, Edo. de México, Mexico.
authors.forename: Pawan
authors.initials: P
authors.lastname: Singh
mesh_terms: D005670:Fusarium / Q000472:pathogenicity*; D057865:Plant Immunity / Q000235:genetics*; D040641:Quantitative Trait Loci; D014908:Triticum / Q000235:genetics* / Q000276:immunology / Q000382:microbiology