Search for dissertations about: "asteraceae"

Showing result 1 - 5 of 19 swedish dissertations containing the word asteraceae.

  2. 1. Phylogenies and Secondary Chemistry in Arnica (Asteraceae)

    Author : Catarina Ekenäs; Katarina Andreasen; Anders Backlund; Lynn Bohs; Uppsala universitet; []
    Keywords : Biology; phylogeny; ITS; ETS; RPB2; sesquiterpene lactones; PCA; bioassay; NF-κB; neutrophil; chloroplast; Biologi; Arnica; Asteraceae;

    Abstract : The genus Arnica (Asteraceae) was investigated for phylogenetic relationships and sesquiterpene lactone (STL) content with the aims to trace the evolutionary history of the genus and to investigate possible congruencies between DNA sequence data, secondary chemistry, and biological activity. Complex evolutionary patterns in Arnica are evident from phylogenetic analyses of chloroplast regions (the rpl16 and rps16 introns and the psbA–trnH, ycf4–cemA, and trnT–L spacers), nuclear ribosomal regions (the internal and external transcribed spacers) and the nuclear low-copy DNA region coding for the second largest subunit of RNA polymerase II (RPB2) between exons 17 and 23. READ MORE

  4. 2. Seed dormancy and germination in an ecological context : comparative studies of annual weeds

    Author : Laila Karlsson; Per Milberg; Ken Thompson; Linköpings universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; Asteraceae; Bidens; Compositae; deadnettle; Galinsoga; germination timing; Guizotia; evolution; Labiatae; Lamiaceae; Lamium; morphophysiological dormancy; Papaveraceae; Papaver; Parthenium; physiological dormancy; poppy; summer annual; Tagetes; Verbesina; winter annual; Biology; Biologi;

    Abstract : Germination ecology studies, i.e. studies of interactions between characteristics of the seeds and environmental circumstances, provide understanding of spatial and temporal patterns of emergence of wild species, as weeds in the field. A large number of species have seed dormancy, i. READ MORE

  5. 3. Causes and consequences of plant distribution and abundance in fragmented habitats

    Author : Anna Jakobsson; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; asteraceae; plant communities; population dynamics; colonizing ability; seed size; plant ecology; Växter; geografisk utbredning;

    Abstract : .... READ MORE

  6. 4. Systematics of the Blennospermatinae (Asteraceae, Senecioneae)

    Author : Ulf Swenson; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : .... READ MORE

  7. 5. Systematics of the genus Metalasia (Asteraceae-Gnaphalieae)

    Author : Per Ola Karis; Stockholms universitet; []
    Keywords : Växtgeografi-- Sydafrika; Systematik; Korgblommiga växter;

    Abstract : .... READ MORE