Show simple item record

Optimal search in ex situ collections of wheat genetic resources

Author: Gollin, D.
Author: Smale, M.
Author: Skovmand, B.
Year: 1998
ISSN: 0258-8587
URI: http://hdl.handle.net/10883/958
Abstract: This paper develops a theoretical model for analyzing gene bank management decisions regarding the search for traits of economic value in ex situ collections of wheat. The model is applied to data on the probability of finding useful sources of resistance to Russian wheat aphid (Diuraphis noxia) and septoria tritici leaf blotch, using Monte Carlo simulations for sampling distributions, simulations of varietal diffusion paths, and actual cost data from searches. Three specific questions are posed and answered: (1) what is the optimal size of search among genetic resources of a given type for a trait of economic value? (2) what is the value of specialized knowledge about which genetic resources are most likely to display resistance? and (3) how should search resources be allocated across types of genetic resources? Results demonstrate the sensitivity of the optimal size of search to the economic importance of the problem, the probability distributions of the trait in different types of genetic resources, and the cost and time lags associated with transferring the trait into usable breeding material. The cost and time lags involved with conventional pre-breeding techniques imply that in some searches, certain categories of genetic resources (such as landraces) will be systematically ignored. The fact that they may be rarely utilized does not imply that collections of landraces have no value, however, as shown in the case of Russian wheat aphid. Though applied here to data on insect and disease resistance, the model can be adapted to search decisions for other types of traits.
Format: PDF
Language: English
Publisher: CIMMYT
Serie: CIMMYT Economics Working Paper
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Book
Region: Global
Place of Publication: Mexico
Pages: 34 pages
Keywords: CIMMYT
Serie Number: 98-03
Agrovoc: WHEAT
Agrovoc: GENETIC RESOURCES
Agrovoc: GERMPLASM
Agrovoc: GERMPLASM CONSERVATION
Agrovoc: GENE BANKS
Agrovoc: GENE POOLS
Agrovoc: MANAGEMENT
Agrovoc: COST BENEFIT ANALYSIS
Agrovoc: ECONOMIC ANALYSIS
Agrovoc: SIMULATION MODELS
Agrovoc: STATISTICAL METHODS
Agrovoc: PLANT BREEDING
Agrovoc: PEST RESISTANCE
Agrovoc: APHIDOIDEA
Agrovoc: DISEASE RESISTANCE
Agrovoc: LEAF BLOTCH


Files in this item

Thumbnail

This item appears in the following Collection(s)

  • Genetic Resources
    Genetic Resources including germplasm collections, wild relatives, genotyping, genomics, and IP
  • Socioeconomics
    Including topics such as farming systems, markets, impact & targeting, innovations, and GIS
  • Wheat
    Wheat - breeding, phytopathology, physiology, quality, biotech

Show simple item record