Search for dissertations about: "Arabidopsis lyrata"
Found 5 swedish dissertations containing the words Arabidopsis lyrata.
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1. Ecology and Evolution of Resistance to Herbivory : Trichome Production in Arabidopsis lyrata
Abstract : In this thesis, I examine variation in occurrence and performance of glabrous and trichome-producing plants of the perennial herb Arabidopsis lyrata. I combine field studies and genetic analysis to (1) examine the function of trichomes as a resistance character in natural populations, (2) compare the magnitude of population differentiation in trichome-production and at putatively neutral marker loci, (3) examine the molecular genetic basis of trichome-production, and (4) quantify the effects of herbivore removal on population growth and relative performance of glabrous and trichome-producing plants. READ MORE
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2. Plant-Animal Interactions and Evolution of Floral Display and Flowering Phenology in Arabidopsis lyrata
Abstract : In this thesis, I combined comparative and experimental approaches to examine selection on reproductive traits, and population differentiation in the insect-pollinated, outcrossing, perennial herb Arabidopsis lyrata. More specifically, I (1) determined whether selection on flowering phenology and floral display can be attributed to interactions with pollinators and herbivores, (2) examined whether population differentiation in flowering phenology and floral display is correlated with current selection on these traits, and (3) tested for local adaptation from contrasting environments in Europe. READ MORE
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3. Population genomic analyses of regulatory variation and selection in Brassicaceae species
Abstract : The impact of selection on regulatory variation and the contribution of regulatory changes to phenotypic variation has long been debated in evolutionary genetics. Because cis-regulatory elements such as promoters and enhancers can be difficult to identify, it has been more challenging to quantify the impact of selection on variation in cis-regulatory regions than in protein-coding regions. READ MORE
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4. Plant-Herbivore Interactions and Evolutionary Potential of Natural Arabidopsis lyrata Populations
Abstract : In this thesis, I combined field, greenhouse and common-garden experiments to examine the ecological and evolutionary consequences of plant-herbivore interactions and the genetic architecture of fitness-related traits in the insect-pollinated, self-incompatible, perennial herb Arabidopsis lyrata. More specifically, I examined (1) whether damage to leaves and inflorescences affects plant fitness non-additively, (2) whether trichome production is associated with a cost in terms of reduced tolerance to leaf and inflorescence damage, (3) whether young plant resistance to a specialist insect herbivore varies among populations, and (4) whether the evolution of flowering time, floral display and rosette size is constrained by lack of genetic variation or by genetic correlations among traits. READ MORE
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5. Defense gene responses toward necrotrophic fungi in Arabidopsis thaliana
Abstract : Leptosphaeria maculans an ascomycete in the diverse class of Dothideomycetes, is an devastating pathogen on Brassica crops. In this thesis, tools and knowledge in Arabidopsis thaliana was explored to enhance our knowledge on plant defense to this fungus. Mechanisms that to large extent are shared with other necrotrophic fungi. READ MORE