Sökning: "Flowering time"
Visar resultat 6 - 10 av 52 avhandlingar innehållade orden Flowering time.
6. Plant phenology in seasonal environments
Sammanfattning : Phenology, or the seasonal timing life-history events such as emergence, reproduction and senescence will determine the outcome of interactions between plants and both abiotic and biotic aspects of the environment. Such timing is therefore of utmost importance for plants in seasonal environments. LÄS MER
7. Life History and Tolerance and Resistance against Herbivores in Natural Populations of Arabidopsis thaliana
Sammanfattning : In this thesis, I combined observational studies with field and greenhouse experiments to examine selection on life history traits and variation in tolerance and resistance against herbivores in natural populations of the annual herb Arabidopsis thaliana in its native range. I investigated (1) phenotypic selection on flowering time and plant size, (2) the effects of timing of germination on plant fitness, (3) the effect of leaf damage on seed production, and (4) correlations between resistance against a specialist and a generalist insect herbivore. LÄS MER
8. Genetic and epigenetic mechanisms underlying the regulation of flowering time
Sammanfattning : Developmental transitions and responses to the environment have a tight epigenetic control. Especially the switch to flowering is important for plants because it allows (sexual) reproduction, and should not occur unless the conditions are right. LÄS MER
9. Studies on Natural Variation and Evolution of Photoperiodism in Plants
Sammanfattning : Photoperiodism refers to the organism’s ability to detect and respond to seasonal changes in the daily duration of light and dark and thus constitutes one of the most significant and complex examples of the interaction between the organism and its environment. This thesis attempts to describe the prevalence of variation in a photoperiodic response, its adaptive value, and its putative genetic basis in a common cruciferous weed, Capsella bursa-pastoris (Brassicaceae). LÄS MER
10. Demography and Polyploidy in Capsella
Sammanfattning : Studies of demography and population structure give insight into important evolutionary processes such as speciation and diversification. In the present work I perform such studies in the genus Capsella, which has three species: C. grandiflora, an outcrossing diploid, C. rubella a selfing diploid, and C. LÄS MER
