Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 42 for “"Non-host"”.
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Role of SABP2 in Tobacco Non-Host Resistance.
… genes leading to <em>R</em>-gene resistance or host resistance. Another form of innate immunity is non-host resistance that is exhibited by a given plant species to most strains of a microbial species. <em>R</em>-gene resistance activates salicylic acid (SA) that is synthesized from methyl …
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AY-‐WB phytoplasma manipulations of host and non-‐host leafhopper interactions
Hempitera. In plant hosts, phytoplasmas induce physiological changes and in both hosts modulate plant-‐insect interactions. Previously, interactions have been examined with both hosts infected with phytoplasmas. Thus, it is unclear which organism the effect stems from or how phytoplasmas …
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Immunological responses of fishes to glochidia of freshwater mussels
… Alabama rainbow mussel (Villosa iris). Tested host species was the rock bass (Ambloplites rupestris) and non-host fishes were common carp (Cyprinus carpio) and goldfish (Carassius auratus). Ouchterlony double-diffusion tests showed that both the host and non-host species expressed a specific …
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Essays on the Effects of Immigration on Labor Markets
… effects of an informal labor supply shock on the host regions, the second chapter investigates the spillover effects on non-host regions through the production network, and the third chapter provides a method that the first two chapters rely on. The first chapter studies the effects of Syrian …
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Understanding molecular events during barley aphid interactions
… most aphid species are limited to one or few host species, some are able to reproduce on many plants belonging to different families. Interestingly, aphid probing-behaviour can be observed on both host and non-host plants indicating that interactions take place at the molecular level and may …
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Phosphorus cycling in organic systems
… access to soil P. The fungi colonize roots of host crops, allowing roots to reach immobile pockets of soil P. Colonization by AMF is usually decreased or delayed following partial fallow periods, non-host plants, and the addition of soluble P fertilizers. This thesis consists of two studies. …
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Herbivore movement and spatial population dynamics in a heterogeneous landscape
… planthopper Prokelisia crocea within and among host-plant patches (prairie cordgrass, Spartina pectinata) is affected by the composition of the matrix (the invasive grass smooth brome [Bromus inermis], native non-host grasses, or mudflat). First, using a mark-recapture study in networks of …
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Appreciating the Importance of Parasites: Analyzing and Understanding the Ecology of Parasite-Host Interactions
… is a growing interest in the nature of parasite-host interactions, the role these relationships play in ecological communities, and how human activities alter these associations. Furthermore, because inference about these interactions is usually gained by methods of statistical hypothesis …
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Essays in Industrial Policy, Misallocation and Production Networks
… an industrial zone see a 60% increase in non-farm employment over 15 years, with significant spillovers to non-targeted sectors and municipalities. Combining the methodology with event study designs, I find that industrial zones increase the probability of escaping a low-industrialization …
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Ecology and Molecular Phylogenetics of <i>Hydnora</i> (Hydnoraceae) in Southern Africa
… biology, germination ecology, parasite-host nutritional relationships, and the molecular systematics of this group. Experimental addition of the primary pollinator, <em>Dermestes maculatus</em> to <em>Hydnora africana</em> chamber flowers demonstrated beetle imprisonment during the …
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Impacts of hemiparasitic plants on the vegetation and biogeochemical cycling in two contrasting semi-natural grassland types
… by the hemiparasite suppresses preferred host species to the benefit of non-host species. On the other hand, hemiparasitic litter inputs enhance nutrient cycling with indirect positive effects on both host and non-host. When parasitism effects dominate, decreased host and total biomass are …
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The complex foraging strategy of the specialised gallfly Urophora cardui (Diptera: Tephritidae) for host plants (Cirsium arvense, Asteraceae)
… in terrestrial ecosystems. Foraging for host plants by herbivorous insects is of a central importance. In the present thesis the foraging strategy of the specialised gall fly Urophora cardui on the creeping thistle, Cirsium arvense, was investigated as an example for the foraging of a …
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Molecular characterisation of the <i>Rhynchosporium commune</i> interaction with barley
… between Rhynchosporium commune and its host barley was studied to gain a better understanding of the pathogen during infection and provide further characterisation of resistance in barley, using a combination of bioinformatics, transcript expression analysis, proteomics and confocal …
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Identification and molecular characterisation of elicitor-priming for resistance in tomato against <i>Botrytis cinerea</i>
… plant species), killing the host by inducing necrosis with degradation enzymes (virulence factors) and manipulating its host defences. Non-host inducing agents, such as elicitor molecules, are able to stimulate pathogen-induced defence mechanisms in the plant<sup>4 </sup>and …
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Impact of arbuscular mycorrhizal fungi on crop and weed growth: potential implications for integrated weed managment
… weeds, efficient and environmentally friendly non-chemical weed control approaches are needed to develop multi-tactic integrated weed management (IWM) programs. Using soil microbes for weed suppression has been considered as one of the non-chemical approaches, owing to the microbial potential …
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Elucidation of the Specificity of S. meliloti Chemoreceptors for Host Derived Attractants
… is an agriculturally important legume that hosts S. meliloti and allows the bacterium to invade the plant root and begin fixing nitrogen. Prior to invasion, S. meliloti exists as a free living bacterium and must navigate through the soil to find alfalfa, using chemical signals secreted by …
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EVOLUTIONARY AND MECHANISTIC INTERACTIONS IN VIRUS TRANSMISSION BY APHIDS
… have co-evolved over years of interaction: plant hosts, aphid vectors, plant viruses and the aphid’s bacterial endosymbiont. In this interaction, plant hosts activate their immune defenses against plant viruses and aphids and the latter two use a myriad of strategies to overcome, counteract or …
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Molecular and cellular analyses of pathogenicity and host specificity in rice blast disease
… factor, although its role remains elusive. Host cellular responses after appressorial penetration are equally important in determining if disease will occur. We have characterized the cellular response of one rice variety to a compatible fungal strain (causes disease), an incompatible strain …
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Endogenous production and detoxification of a potent cytotoxin, nitric oxide, in Salmonella enterica serovar Typhimurium and Escherichia coli
… strategies to rapidly adapt to various host (human and animal) and non-host (soil, water and industrial) environments. Nitrosative stress, in the form of RNS such as the potent cytotoxin NO, is an important stress in the Salmonella lifecycle. Salmonella is exposed to exogenous NO, …
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Evaluation of immunological techniques for host fish identification, and cryopreservation of embryos for conserving rare freshwater mussels
… to and become encysted in the gills or fins of host fish species. The immune responses of the host fish to the parasite affects the susceptibility of the fish to glochidia of different mussels. The immune response provides an opportunity to identify which fish species are hosts. The number and …
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