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  • phylogenetic analysis  (2)
  • Draba alpina complex  (1)
  • 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 analysis ofEremosyne pectinata (Saxifragaceae s. l.) based onrbcL sequence data (1997)
    Springer
    Plant systematics and evolution 204 (1997), S. 225-232 
    Details
    ISSN: 1615-6110
    Keywords: Saxifragaceae s. l. ; Eremosyne pectinata ; rbcL sequence analysis ; chloroplast DNA ; molecular systematics ; phylogenetic analysis ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Earlier analyses ofrbcL sequences clarified phylogenetic relationships of 16 of 17 subfamilies ofSaxifragaceae s. l. This study investigates the affinities of the monotypicEremosynoideae, the only subfamily ofSaxifragaceae s. l. not examined previously forrbcL sequence variation. Our analyses suggest thatEremosyne is only distantly related to core members ofSaxifragaceae s. l. (i.e.Saxifragoideae = Saxifragaceae s. str.); it is allied instead with members ofAsteridae. A particularly close relationship is indicated betweenEremosyne andEscallonia, another traditional member ofSaxifragaceae s. l. that also appears as part ofAsteridae. Inclusion ofEremosyne withinAsteridae is in agreement with embryology, as well as with 18S rDNA sequence data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989207
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  • 3
    Electronic Resource
    Electronic Resource
    DNA sequence data reveal polyphyly of Brexioideae (Brexiaceae; Saxifragaceae sensu lato) (1999)
    Springer
    Plant systematics and evolution 219 (1999), S. 199-208 
    Details
    ISSN: 1615-6110
    Keywords: Brexioideae ; Brexia ; Ixerba ; Roussea ; Saxifragaceae s. l. ; 18S rDNA andrbcL sequence analysis ; molecular systematics ; phylogenetic analysis ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Previous molecular phylogenetic analyses have demonstrated that Saxifragaceae sensu lato are polyphyletic, with component lineages scattered throughout the eudicots. As part of our effort to elucidate the relationships of members of Engler and Prantl's Saxifragaceae s. l., we undertook a molecular systematic study of subfamily Brexioideae, which comprises three genera:Brexia, Ixerba, andRoussea. Not all taxonomic treatments have concurred, however, in placing these genera together. To elucidate relationships among these three genera as well as their relationships to other angiosperms we constructed large data sets ofrbcL, 18S rDNA, andrbcL + 18S rDNA sequences. Our phylogenetic analyses indicate clearly that Brexioideae are polyphyletic.Brexia is part of a celastroid clade that also includesParnassia, Lepuropetalon, and Celastraceae.Ixerba appears as sister to a large eurosid I clade;Roussea appears as part of Asterales. Molecular data, therefore, indicate that Brexioideae are a polyphyletic assemblage and component genera should ultimately be incorporated into other groups. Our studies continue to demonstrate the polyphyly not only Saxifragaceae s. l., but also of its constituent subfamilies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985579
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