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 96 for “"plant pathogens"”.
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Molecular Identification of Plant Pathogens Affecting Cannabis sativa Crops in Nevada
Cannabis sativa L. is an herbaceous flowering plant in the family Cannabaceae. C. sativa has emerged to be an important economic crop in the United States and is now widely cultivated as hemp for fiber, oil, and seed, and as marijuana (referred to henceforth as cannabis) for medicinal or …
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Ensemble models to assess the risk of exotic plant pathogens in a changing climate
… that attempt to model the climate suitability of plant pathogens before their arrival into a new area mainly rely on a single model projection. In this research, eleven species distribution models (in the form of three modelling approaches which include correlative and mechanistic models) were …
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Using Modelling to Optimise the Use of Biological Control Agents Against Soil-Borne Plant Pathogens
… control agents as a control strategy against plant pathogens. However, significant variability in their success at pathogen suppression across field trials has resulted in them often not being seen as commercially viable. This thesis uses mathematical modelling to explore the interactions …
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Computational Tools for Improved Detection, Identification, and Classification of Plant Pathogens Using Genomics and Metagenomics
Plant pathogens are one of the biggest threats to plant health and food security worldwide. To effectively contain plant disease outbreaks, classification and precise identification of pathogens is crucial to determine treatment and preventive measurements. Conventional methods of detection such as …
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Genomic, transcriptomic, and metagenomic approaches for detecting fungal plant pathogens and investigating the molecular basis of fungal ice nucleation activity
… in various environments. Some of them infect plants and cause economically important diseases. However, many fungal pathogens cause similar symptoms or are even spread asymptomatically, making it difficult to identify them morphologically. Therefore, culture-independent, sequence-based …
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Characterization of <i>Phytophthora</i> Species in Recycled Irrigation Water at a Container Nursery in Southwestern Virginia
… concern, yet basic research on waterborne plant pathogens in Virginia is lacking. In this work seasonal fluctuations and locations of Pythiaceae in a recycled water irrigation system at a container nursery were determined. <i>Pythium</i> spp. were recovered more frequently and in greater …
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The Role of Plasmids in Microbial Secondary Metabolism
… and P. coronafaciens are three closely related plant pathogens that differ only in their ability to produce the phytotoxin, tabtoxin, their resistance to tabtoxin, and their host specificity. The possibility that the genes for these characteristics were plasmid-borne was examined.
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A potential energy-saving heat treatment for re-circulated irrigation water and its biological mechanisms
… water treatment to address the emerging plant pathogen issue associated with increased water recycling practices in the ornamental horticulture industry. The current protocol that recommends treating water at 95"C for 30 s, however, faces two major challenges: its energy cost and …
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How Oomycete and Fungal Effectors Enter Host Cells and Promote Infection
… a large number of species that are known plant pathogens of a variety of important crops. Phytophthora sojae, a hemibiotroph, causes approximately 1-2 billion dollars (US) of lost soybean world-wide each year. P. infestans, the causative agent of the Irish potato famine, is responsible for …
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Chloroplast Biotechnology in Higher Plants: Expressing Antimicrobial Genes in the Plastid Genome
… crop species may enhance resistance to microbial pathogens and facilitate reduced pesticide load, the possibility for transmission of novel genes to wild relatives has hampered acceptance of GM crops in some markets. Chloroplast transformation presents an attractive alternative to nuclear …
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Diversity Analysis of Soil Fungus Communities in Disturbed, Nursery, and Mature Forest Conditions
… fungi communities present on the overpass before plant introduction, those that plants would be bringing in their pots, and the fungi that could be introduced via soil plug transplantation. DNA was extracted from soil samples, then sequenced using next-generation sequencing methods, allowing for …
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Distribution and Frequency of Aquatic Oomycetes Throughout Marin County in Relation to Physical Chemical Water Parameters
… </em>and<em> </em>are a well-known group of plant pathogens and saprophytes. Important species include <em>Phytophthora ramorum </em>(causal agent of sudden oak death), <em>Pythium aphanidermatum</em> (root rot), and <em>Phytophthora infestans </em>(late potato blight), all major threats to …
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A Bioinformatics Analysis of Bacterial Type-III Secretion System Genes and Proteins
… flagella, and the interaction of many animal and plant pathogens with eukaryotic cells. T3SSs consist of multiple proteins which assemble to form an apparatus capable of exporting proteins through both membranes of Gram-negative bacteria in one step. Proteins conserved amongst T3SSS can be used …
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Development of an Autonomous Unmanned Aerial Vehicle for Aerobiological Sampling
… monitor, and forecast the movement of airborne plant pathogens in agricultural ecosystems is essential for developing rational approaches to managing these habitats. We developed an autonomous (self-controlling) unmanned aerial vehicle (UAV) platform for aerobiological sampling tens to hundreds …
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Systems View Of The Soybean Genetic Mechanisms Involved In The Response To Plant Pathogen Infection
This thesis involves the important crop plant soybean (Glycine max), and provides a rich information resource for breeders and geneticists working towards improving traits for pathogen resistance.Results reported here provide a systemic view at both the genetic and biochemical level, and were …
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Effect of soilpH and temperature on the biological control of Rhizoctonia solani by Bacillus megaterium and Trichoderma harzianum
… on the biological control of soilborne plant pathogens. In vitro experiments showed that T. harzianum isolate Th008 was antagonistic to R. solani and compatible to B. megaterium strain B153-2-2. Under greenhouse conditions, disease was more severe at soil pH 7.0 than 5.5 and at soil …
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Perennial Grass Based Crop Rotations in Virginia: Effects on Soil Quality, Disease Incidence, and Cotton and Peanut Growth
… and nitrogen, water stable soil aggregates, plant available water content, bulk density, cone index values, and soil moisture. Cotton and peanut growth and yield were also observed to evaluate changes in crop growth associated with differences in soil quality. Soilborne plant pathogens …
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