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  • 1
    Electronic Resource
    Electronic Resource
    Electrophoretic relationships and phylogeny of Nordic polyploids inDraba (Brassicaceae) (1992)
    Springer
    Plant systematics and evolution 182 (1992), S. 35-70 
    Details
    ISSN: 1615-6110
    Keywords: Brassicaceae ; Draba ; Draba alpina complex ; Draba crassifolia ; Enzyme electrophoresis ; allopolyploidy ; fixed heterozygosity ; inbreeding ; multiple origins ; polyphyly ; phylogeny ; phytogeography ; Flora of Scandinavia ; Svalbard
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 104 populations of 15 Nordic species (2x–16x) of the taxonomically complex genusDraba were investigated using enzyme electrophoresis. The polyploids were genetic alloploids showing high levels of fixed heterozygosity and electrophoretic variation; the diploids were homozygous and genetically depauperate. Thus, the data suggest that alloploidy in arctic-alpineDraba serves as an escape from genetic depauperation caused by inbreeding at the diploid level. Although some populations probably have local alloploid origins, electrophoretic data indicate that several polyploids have migrated repeatedly into the Nordic area.Draba crassifolia (2n = 40) is probably octoploid based on x = 5. A hypothesis on the evolutionary history of the polyploids based on x = 8 is presented. Diploids contributing to numerous polyploid genomes and multiple origins of polyploids have seriously blurred taxonomic relationships. Relationships inferred from genetic data do not always correspond to those based on morphology; two morphologically very similar polyploids,D. alpina andD. oxycarpa, were, for example, genetically distant and probably represent independent lineages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00941414
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  • 2
    Electronic Resource
    Electronic Resource
    Phylogenetic relationships ofPolemoniaceae inferred from 18S ribosomal DNA sequences (1999)
    Springer
    Plant systematics and evolution 214 (1999), S. 65-89 
    Details
    ISSN: 1615-6110
    Keywords: Asteridae ; Polemoniaceae ; 18S rDNA sequences ; systematics ; phylogenetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cladistic analyses of chloroplast DNA disagree with current classifications by placingPolemoniaceae near sympetalous families with two staminal whorls, includingFouquieriaceae andDiapensiaceae, rather than near sympetalous families with a single staminal whorl, such asHydrophyllaceae andConvolvulaceae. To explore further the affinities ofPolemoniaceae, we sequenced 18S ribosomal DNA for eight genera ofPolemoniaceae and 31 families representing a broadly definedAsteridae. The distribution of variation in these sequences suggest some sites are hypervariable and multiple hits at these sites have obscured much of the hierarchical structure present in the data. Nevertheless, parsimony, least-squares minimum evolution, and maximum likelihood methods all support a monophyleticPolemoniaceae that is placed nearFouquieriaceae, Diapensiaceae and related “ericalean” families.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985732
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