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  • 1
    Electronic Resource
    Electronic Resource
    Rapid and recent origin of species richness in the Cape flora of South Africa (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 412 (2001), S. 181-183 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Cape flora of South Africa grows in a continental area with many diverse and endemic species. We need to understand the evolutionary origins and ages of such ‘hotspots’ to conserve them effectively. In volcanic islands the timing of diversification can be precisely measured with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35084067
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  • 2
    Electronic Resource
    Electronic Resource
    Family relationships of the enigmatic rosid generaBarbeya andDirachma from the Horn of Africa region (1998)
    Springer
    Plant systematics and evolution 213 (1998), S. 103-119 
    Details
    ISSN: 1615-6110
    Keywords: Barbeyaceae ; Dirachmaceae ; Elaeagnaceae ; Rhamnaceae ; Rosaceae ; Ulmaceae ; Urticales ; Barbeya ; Dirachma ; Actinorhizal symbiosis ; plastid DNA ; monotypic plant families ; phylogeny ; rbcL ; rosids ; trnL-F ; Africa ; Arabia ; Socotra ; Somalia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Barbeya is a monotypic genus in the Horn of Africa and adjacent parts of Arabia. It is usually treated as the familyBarbeyaceae and regarded as an aberrant member ofUrticales. Dirachma, with one species on Socotra and one in Somalia, is usually treated as the familyDirachmaceae, inGeraniales, but a position inMalvales has also been suggested. Analyses of molecular data, from bothrbcL andtrnL-F, indicate thatBarbeya andDirachma are closely related inter se as well as toRhamnaceae andElaeagnaceae. In an analysis based on morphologyBarbeya groups withElaeagnaceae, andDirachma withRhamnaceae andUlmaceae. In a combined molecular and morphological analysisBarbeya is the sister group ofElaeagnaceae andDirachma is the sister group of the wholeBarbeya-Elaeagnaceae-Rhamnaceae clade. However, the support for these arrangements is weak and, rather than mergingBarbeyaceae withDirachmaceae as suggested by the molecular analysis or withElaeagnaceae as suggested by the morphological and combined analyses, it seems best to retain bothBarbeyaceae andDirachmaceae in their present circumscriptions, but in both cases in completely new positions in the angiosperm system. The results are compatible with a new circumscription ofRhamnales comprisingRhamnaceae, Elaeagnaceae, Dirachmaceae andBarbeyaceae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988911
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  • 3
    Electronic Resource
    Electronic Resource
    Simultaneous parsimony jackknife analysis of 2538rbcL DNA sequences reveals support for major clades of green plants, land plants, seed plants and flowering plants (1998)
    Springer
    Plant systematics and evolution 213 (1998), S. 259-287 
    Details
    ISSN: 1615-6110
    Keywords: Parsimony jackknifing ; phylogenetic analysis ; large data sets ; rbcL ; DNA sequences ; green plants ; land plants ; seed plants ; flowering plants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ever-larger data matrices resulting from continuing improvements in DNA sequencing techniques require faster and more efficient methods of phylogenetic analysis. Here we explore a promising new method, parsimony jackknifing, by analyzing a matrix comprising 2538 sequences of the chloroplast generbcL. The sequences included cover a broad taxonomic range, from cyanobacteria to flowering plants. Several parsimony jackknife analyses were performed, both with and without branch-swapping and multiple random addition sequences: 1) including all positions; 2) including only first and second codon positions; 3) including only third positions; and 4) using only transversions. The best resolution was obtained using all positions. Removal of third positions or transitions led to massive loss of resolution, although using only transversions somewhat improved basal resolution. While branch-swapping improved both resolution and the support found for several groups, most of the groups could be recovered by faster simple analyses. Designed to eliminate groups poorly supported by the data, parsimony jackknifing recognizes 1400 groups on the basis of allrbcL positions. These include major taxa such as green plants, land plants, flowering plants, monocots and eudicots. We include appendices of supported angiosperm families, as well as larger groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985205
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    An investigation of morphogenesis within the genus Trifolium (1987)
    Springer
    Plant cell, tissue and organ culture 11 (1987), S. 37-46 
    Details
    ISSN: 1573-5044
    Keywords: Trifolium spp. ; Trifolium repens ; morphogenesis ; selected genotypes ; breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Morphogenic responses within the genus Trifolium were investigated by culturing various explants from seedlings of 72 species. Seedlings from 32 species produced callus alone, 40 produced adventitious shoots and/or roots, of which 25 species produced only shoots and 7 species formed only roots. Seedlings within each species also varied in their response to culture. The section of these seedlings most likely to produce adventitious shoots was the original shoot with the remnants of the surrounding hypocotyl and cotyledons, followed by the excised cotyledons themselves. Inter- and intra-varietal variation was observed in T. repens. Genotypes that produced adventitious buds were selected and crossed. An improvement in the proportion of the population capable of morphogenesis was observed in one cultivar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00036574
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  • 5
    Electronic Resource
    Electronic Resource
    Condensed tannins in Trifolium species and their significance for taxonomy and plant breeding (1993)
    Springer
    Genetic resources and crop evolution 40 (1993), S. 7-13 
    Details
    ISSN: 1573-5109
    Keywords: bloat ; chemotaxonomy ; clover ; germplasm assessment ; plant breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Populations of 59 Trifolium taxa were screened for condensed tannin content using the vanillin-HC1 test. Eight species (T. arvense, T. aureum, T. badium, T. campestre, T. dubium, T. micranthum, T. patens and T. spadiceum) were shown to contain tannins. These species are all found in Section Chronosemium or Section Trifolium Subsection Arvensia of the genus, and thus presence of tannins appears to have a taxonomic significance. Screening populations within species showed differences in tannin content, but no plants in these species were free of tannins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00053459
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    In what situations isin vitro culture appropriate to plant conservations? (1994)
    Springer
    Biodiversity and conservation 3 (1994), S. 176-183 
    Details
    ISSN: 1572-9710
    Keywords: conservation ; cryopreservation ; in vitro culture ; micropropagation ; somaclonal variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Variousin vitro techniques are available for plant propagation, including seed germination, micropropagation, meristem culture and callus culture. The role of these techniques in the conservation of endangered plants is discussed, using examples drawn from the work of the Micropropagation Unit at Kew.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02291887
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  • 7
    Electronic Resource
    Electronic Resource
    From the waters of Babylon? Populus euphratica in Spain is clonal and probably introduced (1999)
    Springer
    Biodiversity and conservation 8 (1999), S. 769-778 
    Details
    ISSN: 1572-9710
    Keywords: AFLPs ; conservation genetics ; Populus euphratica ; Spain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Populus euphratica from the only known population in Spain was studied using genetic fingerprinting (AFLPs) to evaluate the level of genetic variation in the population. Three primer combinations were used, giving 132 interpretable bands. Using this technique we were unable to detect any genetic variation between individuals tested, and the population appears to be clonal in origin. The results are discussed in relation to the likely history of the population and its conservation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008842230383
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