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  • Articles: DFG German National Licenses  (2)
  • PGR  (1)
  • Seedling mortality  (1)
  • 1
    ISSN: 1573-5036
    Keywords: Betula pendula ; Buddleia davidii ; Polyethylene glycol ; Seedling mortality ; Soil matric potential ; Water stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A simple container is described whereby small seedlings may be grown at controlled levels of water stress. The water stress was induced in the soil by an osmoticum which is separated from the soil by a semi-permeable membrane. The mortality ofBetula pendula seedlings was markedly increased at a matric potential of −1.6 bars whereas the mortality ofBuddleia davidii was only affected below −2.8 bars. This difference in tolerance to water stress at the seedling stage might not be reflected in the distribution of the species in the colonisation of chalk and sand pits in England unless there is a dry spring.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Genetic resources and crop evolution 44 (1997), S. 337-348 
    ISSN: 1573-5109
    Keywords: conservation ; methodology ; PGR ; priorities ; target taxa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The signing and ratification of the Convention on Biological Diversity has resulted in increased scientific and public interest in the conservation and utilisation of biological diversity. This has in turn triggered the need to develop more effective methodologies to conserve biological diversity for the benefit of all humanity. One of the first factors to be considered when conserving botanical diversity is the efficient and effective selection of the target taxa. The aim of this paper is not to set detailed priorities for the genetic conservation of the plant genetic resources of any particular crop or species complex, but to draw attention to the factors that should be considered when formulating priorities. The factors that are considered important when selecting plant genetic resource targets are: current conservation status; potential economic use; threat of genetic erosion; genetic distinctiveness; ecogeographic distribution; biological importance; cultural importance; cost, feasibility and sustainability; legislation; ethical and aesthetic considerations; and priorities of the conservation agency undertaking the conservation. Each of these factors is discussed in turn. Although it is not possible to provide a single methodology for the selection of plant genetic resource targets at this time, it is hoped that the consideration the factors discussed will make the selection of target taxa more object, make better use of the limited conservation resources and thus enhance the process of genetic conservation as a whole.
    Type of Medium: Electronic Resource
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