Search Results - (Author, Cooperation:L. Guarino)

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  1. 1
    Staff View
    Publication Date:
    2013-07-05
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Acclimatization/genetics ; Agriculture/economics/*methods/*trends ; Biodiversity ; Biological Specimen Banks ; Breeding ; Crops, Agricultural/genetics ; Food Supply/*statistics & numerical data ; Genes, Plant ; Humans ; Phenotype ; Seeds/genetics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    Publication Date:
    2018-06-21
    Publisher:
    Nature Publishing Group (NPG)
    Electronic ISSN:
    2041-1723
    Topics:
    Biology
    Chemistry and Pharmacology
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Staff View
    ISSN:
    0167-4781
    Keywords:
    Baculovirus ; BmNPVIEG ; Nuclear polyhediosis virus ; Transactivation
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0167-4781(92)90511-W

    Articles: DFG German National Licenses
  4. 4
    Mitchley, J. ; Guarino, L.
    Springer
    Published 1984
    Staff View
    ISSN:
    1573-5052
    Keywords:
    Asymmetric matrices ; Canonical analysis ; Chalk grassland ; Control of relative abundance ; Half-diallel experiment ; Interference ; Leaf overtopping ; Perennial species ; Point quadrats
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Notes:
    Abstract Gower's (1977) method for the canonical analysis of asymmetric matrices (CAA) where the same entities index both the rows and the columns is described. This technique displays the indexing entities in a series of orthogonal planes of decreasing importance in such a way as to preserve the pattern of the asymmetry between them. The analysis is applied to a half-diallel experiment and to some leaf-overtopping data, both from a study of the control of relative abundance of perennials in chalk grassland. The results suggest a common source for the asymmetry in the very different interference and overtopping data, namely that of leaf height. It is concluded that relative abundance in the field may be determined, in part, by leaf height through aboveground interference between plants.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00031930

    Articles: DFG German National Licenses
  5. 5
    Humphries, R. N. ; Jordan, M. A. ; Guarino, L.
    Springer
    Published 1982
    Staff View
    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
    URL:
    http://dx.doi.org/10.1007/BF02184261

    Articles: DFG German National Licenses
  6. 6
    Dulloo, M.E. ; Guarino, L. ; Ford-Lloyd, B.V.
    Springer
    Published 1997
    Staff View
    ISSN:
    1573-5109
    Keywords:
    Africa ; crop evolution ; DNA technology ; genetic diversity ; genetic markers ; germplasm ; isozyme
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes:
    Abstract A review of the existing literature available on the bibliographic CD-ROM PlantGeneCD on the use of protein and molecular markers on plant material from sub-Saharan Africa was undertaken. The review showed that these molecular techniques have been used in a wide range of studies, from measurement of genetic diversity within single population to the elucidation of phylogenetic relationship among species in a genus or group of genera. The review revealed that 67% of the 146 studies examined used protein electrophoresis (58% isozymes, the rest mostly seed proteins), 20% used RFLPs, 8% RAPDs and 3% sequencing. Isozymes have been used for a whole range of applications, whereas electrophoresis of other proteins has mainly been used to study ecogeographic distribution of diversity in crops. RAPDs have been used particularly in the investigation of genetic relationship among accessions of a single species and phylogentic relationship among species. RFLPs of cpDNA have mostly been used at the interspecific level and nuclear markers at the intraspecific level. The studies covered most of the major crop species of Africa and their wild relatives, though important gaps remain, for example sweet potato. So-called “minor” crops were not well represented. Wild taxa not related to crops were also covered, in particular agroforestry and forest species.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1008676617657

    Articles: DFG German National Licenses
  7. 7
    Maxted, N. ; Hawkes, J.G. ; Guarino, L. ; Sawkins, M.
    Springer
    Published 1997
    Staff View
    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
    URL:
    http://dx.doi.org/10.1023/A:1008643206054

    Articles: DFG German National Licenses
  8. 8
    Tchoundjeu, Z. ; Weber, J. ; Guarino, L.
    Springer
    Published 1997
    Staff View
    ISSN:
    1572-9680
    Keywords:
    long-term conservation ; Sahel ; seed collection
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes:
    Abstract The International Centre for Research in Agroforestry (ICRAF) coordinates a research network in the Semi-arid Lowlands of West Africa (SALWA) in four countries: Burkina Faso, Niger, Mali and Senegal. Prosopis africana, an important agroforestry tree species is seriously threatened in this eco-region. ICRAF organized seed collections of this species for long-term conservation and subsequent utilization by small-scale farmers in the West African Sahel. Prior to the collection, ICRAF, the International Plant Genetic Resources Institute (IPGRI) and International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) organized a planning workshop with collaborating national research institutes. Out of this workshop came a consensus on the strategy, logistics and choice of collection sites. To collect as much genetic diversity of P. africana in the SALWA region as possible, 34 collection sites were selected: 15 in Niger, eight in Mali, seven in Burkina Faso and four in Senegal. The main aim of the collection was to capture the genetic diversity within P. africana before the valuable genetic resources are lost. This paper reviews the methodology and results of the germplasm collection.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1005887706700

    Articles: DFG German National Licenses