Search for dissertations about: "pollen tube growth rate"
Found 5 swedish dissertations containing the words pollen tube growth rate.
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1. Pollen Competition as a Target for Sexual Selection in Plants
Abstract : According to the theory of sexual selection, traits can evolve because they confer a mating advantage in competition with members from the same sex. In animals, sexual selection is considered as an important evolutionary force. In this thesis I have investigated the potential for sexual selection in plants. READ MORE
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2. Sexual conflict and selection on pistil and pollen traits
Abstract : The incidence of sexual selection in plants is today acknowledged, however, just as in animals, evolution and maintenance of mate choice is gravely underexplored. Moreover, the potential for sexual conflicts to occur in plants has only been assessed empirically to a very limited degree. READ MORE
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3. Environmental effects on pollen performance:potential consequences on gene flow
Abstract : This thesis illustrates the effects of environmental factors on pollen performance and its importance on gene flow. Pollen competitive ability between the wild and cultivated species of four genera belonging to Cucurbitaceae family was compared to evaluate the evolutionary potential for selection on pollen tube growth rate. READ MORE
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4. Effects of Environmental Factors on maternal Choice and Gene Dispersal in Plants
Abstract : Gene dispersal through pollen is affected by both abiotic and biotic environmental factors. In this study, I mainly investigated the effect of environmental factors: nutrient availability, simulated herbivory and floral morphology (flower colour), on the siring success of competing pollen donors and fitness of the resulting offspring. READ MORE
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5. Male and female selective mechanisms, reproductive success and gene flow
Abstract : In this thesis, I have studied male and female selective mechanisms that can affect plant reproductive success and gene flow. I have focussed on sexually selected traits, mainly pollen competition and maternal sorting mechanisms, for example through non-random ovule abortion. READ MORE