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 69 for “"Oomycete"”.
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The Impact of Iron Deficiency on Plant-Oomycete Interactions
… biotic threats such as pathogens and herbivores. Oomycete pathogens represent a significant threat to global food production and natural ecosystems. Novel modes of oomycete disease control could increase crop yield and reduce pesticide application. Overlaps between the plant response to iron …
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Understanding the Impact of Plant Nutrition on Plant-Oomycete Interactions
… However, the role of these nutrients in plant-oomycete interactions is an unexplored area. We developed a hydroponic system to precisely control the nutrients applied to plants. We used Arabidopsis thaliana and Nicotiana benthamiana (N. b) as model plants. Hyaloperonospora arabidopsidis as well …
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How Oomycete and Fungal Effectors Enter Host Cells and Promote Infection
… to induce effector triggered immunity. These oomycete effector proteins translocate into host cells via a highly conserved N-terminal motif known as RXLR-dEER without the use of any pathogen encoded machinery. In fungi an RXLR-like motif exists, [R,K,H] X [L,F,Y,M,~I] X, that is able to …
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Characterization of oomycete species causing soybean diseases in Illinois and management applications
… stem rot (PRR) and seedling diseases caused by oomycetes, are two of the most important yield limitations for soybean production in the US Midwest. Several species of Phytophthora and Pythium cause PRR and seedlings diseases, respectively. PRR is managed using cultivars with single resistance …
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Nuclear Localization of Proteins and Genome Editing in the Oomycete Phytophthora sojae
Oomycetes are fungi-like eukaryotic microorganisms, which are actually phylogenetic relatives of diatoms and brown algae, within the kingdom Stramenopila. Many oomycete species, mainly in the genera Phytophthora, Pythium and downy mildews, are devastating plant pathogens that cause …
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Understanding the role of host amino acid transporters in nutrient acquisition by oomycete pathogens
… arabidopsidis (Hpa) is a naturally occurring oomycete pathogen on Arabidopsis thaliana. It is related to downy mildews of economically important crops such as cabbage, kale and broccoli, belonging to the Brassicaceae family. Downy mildew pathogens are obligate biotrophs that extract nutrients …
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Molecular Analysis of Oomycete Pathogens to Identify and Translate Novel Resistance Mechanisms to Crops
Disease outbreaks caused by oomycetes can be catastrophic. The first part of this dissertation describes development of a system to identify potential new and durable resistance (R) genes against P. sojae in soybean germplasm. We developed a system to screen soybean germplasm for genes that …
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Identification and expression analysis of putative NLR genes in avocado, Persea americana, during infection by the oomycete, Phytophthora cinnamomi
Avocado production in South Africa is significantly affected by the pathogen Phytophthora cinnamomi. This pathogen causes root necrosis in infected rootstocks, which may ultimately lead to plant death and thus economic losses. The complex molecular interactions between avocado and P. cinnamomi are …
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Genomic Evolution in the Oomycetes
Members of the oomycete class include some of the most devastating pathogens of plants and animals. Oomycetes secrete large arsenals of effector proteins that perform a wide range of functions, including sequestering nutrients from hosts and the environment, degrading host cells to facilitate …
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Advancing detection, genomics, and secretome analysis of oomycete pathogens Phytophthora capsici and Phytopythium vexans to explore mechanisms of pathogenesis and biocontrol solutions
Soilborne oomycete pathogens pose persistent challenges to vegetable production systems, particularly in Ontario, Canada, where Phytophthora capsici and the recently reported Phytopythium vexans have emerged as significant threats. Understanding the molecular mechanisms underlying their …
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Host pathogen interaction between European strains of red algae 'Bangia' and oomycete Olpidiopsis porphyrae var. scotiae, and phylogenetic analysis for European 'Bangia' strains
Olpidiopsis is one of the main disease causal agents affecting Neoprophyra (commonly known as Nori) sea farms. A recent study described a Scottish variety in the Scottish water Olpidiopsis porphyrae var. scotiae. I studied the resistance of 11 red algae (‘Bangia’) strains against this new described …
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NOVEL PERSPECTIVES IN THE CONTROL OF PLANT PATHOGENIC OOMYCETES
Plant pathogenic oomycetes pose significant threats to the productivity, quality and sustainability of agricultural production. Traditionally, the control of oomycete-borne diseases is achieved by means of chemical control based on fungicides. However, the negative impact of these molecules on the …
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A tale of two clades: genome evolution of oomycetes and fungi.
… from two groups of filamentous eukaryotes; the oomycetes and the fungi. Although similar in morphology and ecological niche, the two groups are only very-distantly related in terms of evolutionary history. The oomycetes are underresearched in evolutionary science, despite their historical and …
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Exploiting crosstalk between growth and immunity in plants : the role of the <i>Phytophthora infestans</i> effector AVR2 in potato late blight
… AVR2 is one such effector, secreted by the oomycete pathogen Phytophthora infestans; the pathogen responsible for potato late blight. AVR2 interacts with a family of kelch-repeat containing phosphatases in potato, the BSLs, implicated in brassinosteroid pathway signalling – a major hormone …
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Integrative Genomic Approaches for Plant Trait Discovery, Fungal Pathogen Identification and Taxonomy
… inconsistent reference resources for fungal and oomycete identification. This dissertation integrates long-read sequencing, metagenomic approaches, and genome-based classification to address these limitations. First, long-read resequencing of 29 food-grade soybean and edamame genotypes enabled …
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Elucidating essential roles of oomycee effector proteins in immune suppression and in targeting hormonal pathways in the host plant
… Bioinformatic analysis of genome sequences from oomycete pathogens Phytophthora sojae, P. ramorum, P. infestans and Hyaloperonospora arabidopsidis (Hpa) have led to the identification of a large number of candidate effector genes. These effector genes have characteristic motifs (signal peptide, …
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Extracellular Enzyme Production and Wood Degradation by Freshwater Lignicolous Fungi
… wood-inhabiting ascomycetes, hyphomycetes and an oomycete: (1) the range of plant components that they are able to hydrolyze; (2) whether they are able to degrade cell walls of woody tissue; (3) the extent to which they degrade specific wood components such as cellulose, hemicellulose, and lignin; …
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Regulation of plant innate immunity: the role of protein import and the novel MOS4-associated complex
… exhibits enhanced resistance to bacterial and oomycete pathogens. SNC1 encodes an R-gene – a single amino acid change renders this protein constitutively active without interaction with pathogens. snc1 displays a stunted phenotype that may be caused by both the accumulation of toxic compounds …
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Identification of the cir1 disease resistance gene in Arabidopsis thaliana
… Pseudomonas syringae pv. tomato DC3000 and oomycete pathogen Hyaloperonospora parasitica Noco2 and was shown to constitutively express salicyclic acid-, jasmonic acid/ethylene- and reactive oxygen intermediate-responsive genes. Genetic analysis and mapping studies of the mutation revealed …
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Eukaryotic Parasites of Toxic and Bloom-forming Diatoms: Molecular insights in their diversity and physiology
… and diatoms, by focussing on osmotrophic oomycete and fungi, two well-known groups of pathogens sharing similar molecular weaponries and habits despite their large evolutionary distance. By developing a method to isolate and molecularly characterise single cells (SCs) we describe nine …
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