rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Simulation of marker assisted breeding in an applied tree improvement project
    sub title: a case study based on the Western Gulf Forest Tree Improvement Program
  name:
    name part: Byram, Thomas Duane
    name part: 1953-
    role:
      role term: creator
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: xx
    date issued: 2000
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xv, 140 leaves : illustrations ; 28 cm.
  abstract: Marker assisted selection (MAS) was evaluated by Monte Carlo simulation in the context of an applied tree improvement program. Selection was modeled for a quantitative trait where 1, 3, or 5 quantitative trait loci (QTL) explained 60% of the additive genetic variation in a single family used for QTL detection. The remainder of the additive variation was explained by 20 minor genes. The QTL were initially at a frequency of 5% in the breeding population which reduced their contribution to 36% and 22% of the additive genetic variation for QTL originally detected in the backcross (Aa:aa) or intercross (AA:Aa:aa) configuration, respectively. The trait in breeding population was moderately heritable (h²=0.2) and expressed an inbreeding depression as a 5% reduction in phenotype for each 0.1 increase in F. The breeding population consisted of 360 individuals subdivided into 20 sublines. Breeding using a complementary mating system was simulated for 10 generations with and without MAS using both dominant and codominant marker systems with a modification of Breeding System Model (Bridgwater et al. 1993). Markers and traits were assumed to be in linkage equilibrium, therefore MAS was appropriate for within-family selection only. Under these conditions, MAS was not effective for population level improvement. Simulation of MAS in a smaller, highly selected elite-breeding population demonstrated that MAS became more effective as markers became more reliable, within-family selection increased in importance, and the penalty for inbreeding depression increased. Economic analysis of MAS to improve a single quantitative trait indicated the presence of considerable risk with an average negative net present value (NPV) for a large mainline breeding program at a discount factor of 7%. However, the analysis indicated that the uncertainty surrounding this prediction was large and that significantly better returns were achieved in iterations where MAS was effective. NPV was positive for the…
  note: by Thomas Duane Byram.
  note: Vita.
  note: "Major Subject: Molecular and Environmental Plant Sciences".
  note: Issued also on microfiche from University Microfilm Inc.
  note: Ph. D. Texas A&M University 2000.
  note: Includes bibliographical references (leaves 105-111).
  subject:
    topic: Major molecular and environmental plant sciences
  identifier: 99-94218 UMI
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 011105
    record change date: 20190325102856.0
    record identifier: in00001637272