Mapping a Type 1 FHB resistance on chromosome 4AS of Triticum macha and deployment in combination with two Type 2 resistances

Theor Appl Genet. 2015 Sep;128(9):1725-38. doi: 10.1007/s00122-015-2542-9. Epub 2015 Jun 4.

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Chromosome Mapping*
  • Chromosomes, Plant / genetics
  • Disease Resistance / genetics*
  • Expressed Sequence Tags
  • Fusarium / pathogenicity*
  • Genetic Markers
  • Microsatellite Repeats
  • Phenotype
  • Plant Breeding
  • Plant Diseases / genetics*
  • Polymorphism, Single Nucleotide
  • Quantitative Trait Loci
  • Trichothecenes / metabolism
  • Triticum / genetics*
  • Triticum / microbiology

Substances

  • Genetic Markers
  • Trichothecenes
  • deoxynivalenol