Identification of quantitative trait loci for resistance to Verticillium wilt and yield parameters in hop (Humulus lupulus L.)

Theor Appl Genet. 2013 Jun;126(6):1431-43. doi: 10.1007/s00122-013-2062-4. Epub 2013 Feb 20.

Abstract

Verticillium wilt (VW) can cause substantial yield loss in hop particularly with the outbreaks of the lethal strain of Verticillium albo-atrum. To elucidate genetic control of VW resistance in hop, an F1 mapping population derived from a cross of cultivar Wye Target, with the predicted genetic basis of resistance, and susceptible male breeding line BL2/1 was developed to assess wilting symptoms and to perform QTL mapping. The genetic linkage map, constructed with 203 markers of various types using a pseudo-testcross strategy, formed ten major linkage groups (LG) of the maternal and paternal maps, covering 552.98 and 441.1 cM, respectively. A significant QTL for VW resistance was detected at LOD 7 on a single chromosomal region on LG03 of both parental maps, accounting for 24.2-26.0 % of the phenotypic variance. QTL analysis for alpha-acid content and yield parameters was also performed on this map. QTLs for these traits were also detected and confirmed our previously detected QTLs in a different pedigree and environment. The work provides the basis for exploration of QTL flanking markers for possible use in marker-assisted selection.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amplified Fragment Length Polymorphism Analysis
  • Breeding / methods
  • Chromosome Mapping
  • Crosses, Genetic
  • DNA Primers / genetics
  • Disease Resistance / genetics*
  • Genetic Markers / genetics
  • Humulus / genetics*
  • Humulus / growth & development*
  • Humulus / microbiology
  • Lod Score
  • Plant Diseases / microbiology*
  • Quantitative Trait Loci / genetics*
  • Verticillium*

Substances

  • DNA Primers
  • Genetic Markers