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 34 for “"plant host"”.
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Diazotroph Assemblages of Salt Marsh Plants Growing Along An Environmental Gradient: Assemblage Composition and Responses to Environmental Conditions
… diazotrophs associated with other wetland plants have also been studied and found to be plant host specific and diverse. Coastal salt marshes along the eastern coast of the US typically occur along an elevation gradient that results in a distinctive pattern of plant zonation. This study …
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Development of novel approaches to study Cuscuta campestris biology
Cuscuta campestris is an obligate parasitic plant that lacks expanded leaves and roots and requires a host to complete its lifecycle. Parasite-host connections occur via an haustorium, a unique organ that acts as a bridge for the exchange of water, nutrients, macromolecules like mRNA, microRNA, and …
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Rooting for the Home Team: Arbuscular Mycorrhizas and Root Traits in Native and Invasive Woody Shrubs
… change and anthropogenic disturbance. Invasive plant species in particular exhibit ecological, economic, and cultural effects on contemporary issues such as biodiversity, ecosystem processes and global food security. Understanding the factors governing both the invasion process and the species …
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Taxonomic revision of taxa originally described in Leptosphaeria from species in the Ranunculaceae, Papaveraceae and Magnoliaceae
… of the species of Leptosphaeria described from plant species in Ranunculaceae, Papaveraceae and Magnoliaceae; second, completion of a taxonomic revision of L. vagabunda and its infraspecific taxa. Twenty-six taxa described from species in three plant host families, Ranunculaceae, Papaveraceae …
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Pseudomonas/Brachypodium as a Model System for Studying Rhizosphere Plant Microbe Interactions Under Water Stress
… well-studied mechanisms of drought tolerance in plants, the interactions between plants and their microbiome during water stress are still poorly understood. This missing knowledge is crucial for the exploitation of beneficial microbial communities to improve the sustainability of agriculture …
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Studies of bacterial homeostasis Sinorhizobium meliloti and Escherichia coli
… symbiosis between Sinorhizobium meliloti and its plant host Medicago sativa, offers a tractable model to explore the bacterial requirements for endocytic survival in a eukaryotic host. It has been shown that during development of this symbiosis, M. sativa releases an oxidative burst that S. …
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Disentangling plant-microbe interactions under environmental change
… carbon: nitrogen (C:N) ratios and shifting plant-microbial interactions, on which plants are largely dependent. This thesis addresses the potential impacts on plant-microbial interactions under different C:N fertiliser regimes and water-availability by analysing the overall and N-cycling …
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From metacommunity dynamics to rapid biodiversity assessment: DNA-based approaches expand horizons in both fundamental and applied ecology
… what mechanisms govern the persistence of an ant-plant metacommunity. I first use molecular data to clarify the number of coexisting ant species, and then employ population genetic techniques to investigate dispersal scale and other elements of life-history in the three most common species. Where …
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Defining the mechanisms of specificity in the symbiosis signalling pathway of Medicago truncatula
Legume plants are able to form symbiotic interactions with rhizobial bacteria and arbuscular mycorrhizal fungi. The establishment of these two symbioses depends upon signalling between the plant host and the microorganism, of which lipochitooligosaccharide (LCO) signals are essential. Perception of …
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Characterizing global gene expression and antiviral response in Frankliniella occidentalis infected with Tomato spotted wilt virus
… the western flower thrips, transmits the plant-pathogenic virus, Tomato spotted wilt virus (TSWV), through a circulative-propagative transmission strategy. The virus infects and replicates in the insect, traversing membrane barriers as it moves from the midgut to the salivary glands for …
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The Consequences of Plant Anatomy on Viral Co-Infection
Plant viruses are infectious agents that exploit plants to survive, transmitted from host to host primarily by insect vectors. Within plant hosts, viral populations encounter both physical and physiological barriers that may influence their evolution. This work aims to identify opportunities during …
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Histidine Folding Switch In Effector Protein Avrpto Regulates Its Transport Through The Bacterial Type Iii Secretion System, As Determined By Nmr, Fluorescence, Circular Dichroism Spectroscopies And Translocation Assays
… secretion systems as direct conduits into host cell cytoplasm for bacterial effector protein trafficking to further their symbiotic or pathogenic goals, while avoiding detection and host immune responses. Gram-negative bacterium Pseudomonas syringae uses the type III secretion system that …
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Understanding the role of host amino acid transporters in nutrient acquisition by oomycete pathogens
… that extract nutrients exclusively from living plant cells. As a part of its obligate biotrophy lifestyle, Hpa has lost the ability to assimilate inorganic nitrogen and sulfur. It thus has to acquire these nutrients from the host in an organic form; possibly amino acids. Using a reverse genetic …
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Understanding the impact of Russian wheat aphid-associated microbes on plants
Plant-insect-microbe interactions shape the outcome of plant defense responses, yet the role of aphid-associated bacteria in modulating host susceptibility remains largely unexplored. This dissertation investigates the influence of bacterial communities associated with the Russian wheat aphid (RWA, …
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<i>Maize fine streak virus</i> (MFSV) gene expression and protein interaction
… at higher level than N transcripts in both plant and insect hosts, whereas MFSV 4 transcripts accumulated at similar levels than N transcripts in maize but at lower levels in <i>G. nigrifrons</i>. Our results indicate that the regulation of MFSV gene transcription is different from that of …
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The Effect of Environmental Perturbations on the Plant Phyllosphere Microbiome
… The phyllosphere is the aboveground surface of plants on which microbial communities, composed primarily of Bacteria, but also including Archaea and microbial eukaryotes, exist and is characterized by stochastic immigration balanced with strong selective forces. Variation in bacterial community …
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Linking The Functional Diversity Of Ectomycorrhizal Fungal Species To Soil Carbon And The Genetics Of A Foundational Tree Species
… by ectomycorrhizal fungi. In this symbiosis, the plant host provides the vast majority of C for fungal growth. As a consequence, ECM fungi may provide one of the major pathways for C from trees to soils. Ectomycorrhizal fungal species produce extracellular enzymes that may degrade soil carbon and …
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Insights into the Molecular Mechanism of Streptomyces ipomoeae Pathogenesis: Thaxtomin C Biosynthesis and Regulation
… that appears to facilitate their entrance into host plants. S. ipomoeae produces a less-modified thaxtomin derivative (thaxtomin C) whose role in pathogenicity has not been examined. Here, we cloned and sequenced the thaxtomin C (txt) gene cluster of S. ipomoeae and I then constructed targeted …
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Investigation of the recognition and host target of the Phytophthora infestans effector PiAVR2
… further understanding the interactions between plant host proteins and pathogen effector proteins. An objective of this thesis was to determine the host target of the Phytophthora infestans effector PiAVR2 and the means by which this avirulence protein is recognised by the potato resistance …
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