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Visar resultat 1 - 5 av 20 avhandlingar som matchar ovanstående sökkriterier.
1. Phylogenies and Secondary Chemistry in Arnica (Asteraceae)
Sammanfattning : 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. LÄS MER
2. Seed dormancy and germination in an ecological context : comparative studies of annual weeds
Sammanfattning : 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. LÄS MER
3. Causes and consequences of plant distribution and abundance in fragmented habitats
Sammanfattning : .... LÄS MER
4. Systematics of the Blennospermatinae (Asteraceae, Senecioneae)
Sammanfattning : .... LÄS MER
5. Systematics of the genus Metalasia (Asteraceae-Gnaphalieae)
Sammanfattning : .... LÄS MER