Allele-specific CAPS markers based on point mutations in resistance alleles at the pvr1 locus encoding eIF4E in Capsicum

Theor Appl Genet. 2005 Dec;112(1):178-86. doi: 10.1007/s00122-005-0120-2. Epub 2005 Nov 9.

Abstract

Marker-assisted selection has been widely implemented in crop breeding and can be especially useful in cases where the traits of interest show recessive or polygenic inheritance and/or are difficult or impossible to select directly. Most indirect selection is based on DNA polymorphism linked to the target trait, resulting in error when the polymorphism recombines away from the mutation responsible for the trait and/or when the linkage between the mutation and the polymorphism is not conserved in all relevant genetic backgrounds. In this paper, we report the generation and use of molecular markers that define loci for selection using cleaved amplified polymorphic sequences (CAPS). These CAPS markers are based on nucleotide polymorphisms in the resistance gene that are perfectly correlated with disease resistance, the trait of interest. As a consequence, the possibility that the marker will not be linked to the trait in all backgrounds or that the marker will recombine away from the trait is eliminated. We have generated CAPS markers for three recessive viral resistance alleles used widely in pepper breeding, pvr1, pvr1 (1), and pvr1 (2). These markers are based on single nucleotide polymorphisms (SNPs) within the coding region of the pvr1 locus encoding an eIF4E homolog on chromosome 3. These three markers define a system of indirect selection for potyvirus resistance in Capsicum based on genomic sequence. We demonstrate the utility of this marker system using commercially significant germplasm representing two Capsicum species. Application of these markers to Capsicum improvement is discussed.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Alleles*
  • Breeding
  • Capsicum / genetics*
  • Capsicum / virology
  • Crops, Agricultural
  • Eukaryotic Initiation Factor-4E / genetics*
  • Eukaryotic Initiation Factor-4E / metabolism
  • Genetic Markers*
  • Genotype
  • Immunity, Innate / genetics
  • Phenotype
  • Plant Diseases / virology
  • Plant Proteins / genetics*
  • Plant Proteins / metabolism
  • Point Mutation*
  • Polymorphism, Single Nucleotide
  • Sequence Analysis, DNA

Substances

  • Eukaryotic Initiation Factor-4E
  • Genetic Markers
  • Plant Proteins