title: Genetic mapping and haplotype analysis of a locus for quantitative resistance to Fusarium graminearum in soybean accession PI 567516C.
abstract: A major novel quantitative disease resistance locus, qRfg_Gm06, for Fusarium graminearum was genetically mapped to chromosome 6. Genomic-assisted haplotype analysis within this region identified three putative candidate genes. Fusarium graminearum causes seed, root rot, and seedling damping-off in soybean which contributes to reduced stands and yield. A cultivar Magellan and PI 567516C were identified with low and high levels of partial resistance to F. graminearum, respectively. Quantitative disease resistance loci (QDRL) were mapped with 241 F7:8recombinant inbred lines (RILs) derived from a cross of Magellan × PI 567516C. Phenotypic evaluation for resistance to F. graminearum used the rolled towel assay in a randomized incomplete block design. The genetic map was constructed from 927 polymorphic single nucleotide polymorphism (SNP) and simple sequence repeat (SSR) markers. One major QDRL qRfg_Gm06 was detected and mapped to chromosome 6 with a LOD score of 20.3 explaining 40.2% of the total phenotypic variation. This QDRL was mapped to a ~400 kb genomic region of the Williams 82 reference genome. Genome mining of this region identified 14 putative candidate disease resistance genes. Haplotype analysis of this locus using whole genome re-sequencing (WGRS) of 106 diverse soybean lines narrowed the list to three genes. A SNP genotyping Kompetitive allele-specific PCR (KASP) assay was designed for one of the genes and was validated in a subset of the RILs and all 106 diverse lines.
authors.affiliation: Division of Plant Sciences and National Center for Soybean Biotechnology, University of Missouri, Columbia, MO, 65211, USA.
authors.forename: Peng
authors.initials: P
authors.lastname: Cheng
authors.affiliation: Department of Plant Pathology, The Ohio State University, 1680 Madison Avenue, Wooster, OH, 44691, USA.
authors.forename: Cassidy R
authors.initials: CR
authors.lastname: Gedling
authors.affiliation: Division of Plant Sciences and National Center for Soybean Biotechnology, University of Missouri, Columbia, MO, 65211, USA.
authors.forename: Gunvant
authors.initials: G
authors.lastname: Patil
authors.affiliation: Division of Plant Sciences and National Center for Soybean Biotechnology, University of Missouri, Columbia, MO, 65211, USA.
authors.forename: Tri D
authors.initials: TD
authors.lastname: Vuong
authors.affiliation: Division of Plant Sciences, University of Missouri-Fisher Delta Research Center, Portageville, MO, 63873, USA.
authors.forename: J Grover
authors.initials: JG
authors.lastname: Shannon
authors.affiliation: Department of Plant Pathology, The Ohio State University, 1680 Madison Avenue, Wooster, OH, 44691, USA. dorrance.1@osu.edu.
authors.forename: Anne E
authors.initials: AE
authors.lastname: Dorrance
authors.affiliation: Division of Plant Sciences and National Center for Soybean Biotechnology, University of Missouri, Columbia, MO, 65211, USA. nguyenhenry@missouri.edu.
authors.forename: Henry T
authors.initials: HT
authors.lastname: Nguyen
mesh_terms: D002874:Chromosome Mapping; D060467:Disease Resistance / Q000235:genetics*; D005670:Fusarium; D008040:Genetic Linkage; D005819:Genetic Markers; D005838:Genotype; D006239:Haplotypes; D018895:Microsatellite Repeats; D010641:Phenotype; D010935:Plant Diseases / Q000235:genetics* / Q000382:microbiology; D020641:Polymorphism, Single Nucleotide; D040641:Quantitative Trait Loci; D013025:Glycine max / Q000235:genetics* / Q000382:microbiology
chemical_list: D005819:Genetic Markers