title: Mapping a Type 1 FHB resistance on chromosome 4AS of Triticum macha and deployment in combination with two Type 2 resistances.
abstract: Markers closely flanking a Type 1 FHB resistance have been produced and the potential of combining this with Type 2 resistances to improve control of FHB has been demonstrated. Two categories of resistance to Fusarium head blight (FHB) in wheat are generally recognised: resistance to initial infection (Type 1) and resistance to spread within the head (Type 2). While numerous sources of Type 2 resistance have been reported, relatively fewer Type 1 resistances have been characterised. Previous study identified a Type 1 FHB resistance (QFhs.jic-4AS) on chromosome 4A in Triticum macha. Little is known about the effect of combining Type 1 and Type 2 resistances on overall FHB symptoms or accumulation of the mycotoxin deoxynivalenol (DON). QFhs.jic-4AS was combined independently with two Type 2 FHB resistances (Fhb1 and one associated with the 1BL/1RS translocation). While combining Type 1 and Type 2 resistances generally reduced visual symptom development, the effect on DON accumulation was marginal. A lack of polymorphic markers and a limited number of recombinants had originally prevented accurate mapping of the QFhs.jic-4AS resistance. Using an array of recently produced markers in combination with new populations, the position of QFhs.jic-4AS has been determined to allow this resistance to be followed in breeding programmes.
authors.affiliation: John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK.
authors.forename: C
authors.initials: C
authors.lastname: Burt
authors.forename: A
authors.initials: A
authors.lastname: Steed
authors.forename: N
authors.initials: N
authors.lastname: Gosman
authors.forename: M
authors.initials: M
authors.lastname: Lemmens
authors.forename: N
authors.initials: N
authors.lastname: Bird
authors.forename: R
authors.initials: R
authors.lastname: Ramirez-Gonzalez
authors.forename: S
authors.initials: S
authors.lastname: Holdgate
authors.forename: P
authors.initials: P
authors.lastname: Nicholson
mesh_terms: D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics; D060467:Disease Resistance / Q000235:genetics*; D020224:Expressed Sequence Tags; D005670:Fusarium / Q000472:pathogenicity*; D005819:Genetic Markers; D018895:Microsatellite Repeats; D010641:Phenotype; D000069600:Plant Breeding; D010935:Plant Diseases / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D040641:Quantitative Trait Loci; D014255:Trichothecenes / Q000378:metabolism; D014908:Triticum / Q000235:genetics* / Q000382:microbiology
chemical_list: D005819:Genetic Markers; D014255:Trichothecenes; C007262:deoxynivalenol