Search for dissertations about: "Nicotiana"

Showing result 1 - 5 of 31 swedish dissertations containing the word Nicotiana.

2. 1. Elicitor-induced formation of secondary products in plant cell cultures. Production of benzophenanthridine alkaloids in Eschscholtzia californica Cham. and hydroxycinnamic acid tyramides in Nicotiana glutinosa L

   Author : Mirza Villegas; Biokemi och Strukturbiologi; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; macarpine; chelerythrine; sanguinarine; benzophenanthridine alkaloids; Nicotiana glutinosa; Eschscholtzia californica; secondary metabolites; Key words elicitors; immobilisation; hydroxycinnamoyltyramides.; Plant biochemistry; Växtbiokemi;

   Abstract : Biotic and abiotic elicitors induce biosynthesis of secondary metabolites (phytoalexins) as a defense against pathogenic organisms in plants. The use of cell suspension cultures in combination with elicitors offer excellent experimental model systems for studies on various elicitor-induced responses of plant tissues. READ MORE

4. 2. Environmental effects on pollen performance:potential consequences on gene flow

   Author : Margaret Mollel; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Plant ecology; siring ability; risk assessment; pollen germination; pollen tube growth rate; Nicotiana alata; morphological markers; Cucumis sativus; Genetically modified crops hybridisation; Växtekologi;

   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

5. 3. Trichoderma viride alamethicin and plant cells - Action, response and resistance

   Author : Mari Aidemark; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Arabidopsis thaliana; Nicotiana tabacum; cell cultures; alamethicin; cell permeabilisation; resistance; callose; BY-2;

   Abstract : Alamethicin is a membrane active peptide secreted from the soil-living fungus Trichoderma viride. When coexisting with T. Viride, plant roots are exposed to alamethicin, which has the ability to elicit formation of volatile compounds involved in pathogen defence. READ MORE

6. 4. Effects of Environmental Factors on maternal Choice and Gene Dispersal in Plants

   Author : Teklehaimanot Haileselassie; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; siring ability; Maternal effect; genetically modified crops; risk assessment; morphological markers; herbivory; Cucumis sativus; Växtekologi; pollen tube growth rate; Plant ecology; Nicotiana alata;

   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

7. 5. Asexual embryogenesis in plants

   Author : Boel Mårtensson; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Systematic botany; two-phase partitioning; somatic embryogenesis; pollen embryogenesis; plasma membrane; peroxidase; Daucus carota isoperoxidase; Nicotiana tabacum; Ca2 transport; cell shape; calmodulin; taxonomy; morphology; phytogeography; chemotaxonomy. Physiology of nonvascular plants; Systematisk botanik; taxonomi; morfologi; kemotaxonomi. Växters fysiologi inte kärlväxter .;

   Abstract : The capacity of somatic cells and pollen grains or microspores to undergo embryogenesis is an important property used in improvement and regeneration of plants. Furthermore, somatic embryogenesis as well as pollen embryogenesis show many similarities with zygotic embryogenesis and are, thus, good model systems. READ MORE