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Filtering by: Alternative title ssim Extension manual 3 Remove constraint Alternative title ssim: Extension manual 3 Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology Degree Level Doctoral Remove constraint Degree Level: Doctoral

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  • Plant-Pollinator Interactions in a Changing World: Cryptic Specialization, Pollinator Movement, and Landscape Genetics of Pollinator-Dependent Plants

    Creator:
    Gannon, Dustin G.
    Abstract:
    Plant-pollinator mutualisms are one of the most prevalent and economically important mutualisms in nature. Like many other ecological systems, plant-pollinator communities are threatened by anthropogenic activity, both directly (e.g., habitat conversion and fragmentation) and indirectly (e.g., climate change). While we are aware of many of the activities that adversely impact...
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    Dissertation
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    change. In Chapter 3, I explored how forest encroachment into alpine meadows in the Cascade Mountains

  • Landscape Genomics and Climatic Responses of Willamette Valley Alders

    Creator:
    Kral, George L.
    Abstract:
    The climate of the Pacific Northwest is in flux, and existing forest ecosystems are stressed and poised to shift in fundamental ways, with or without human intervention. This dissertation probes the nature of forest responses to environmental change through investigations of morphology and genetics of three species of alder co-occurring...
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    white alder populations, is highly constrained except along the Willamette River. In Chapter 3, we

  • Community Ecology and Population Genomics of Rhizopogon in the Madrean Sky Island Archipelago

    Creator:
    Piña Páez, Carolina G.
    Abstract:
    Anthropogenic induced climate change is predicted to alter distribution of existing plant populations. As plants migrate over space and time, populations often fragment and contract, affecting basic elements of population dynamics (e.g., population size, gene flow, genetic diversity, etc.). Little is known, however, how these impacts on plant species will...
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    Dissertation
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    and assisted with statistical analyses and edited the manuscript. Chapter 3. Javier F

  • Development of Computational, Visualization, and Molecular Tools for Fungal and Oomycete Community Ecology

    Creator:
    Foster, Zachary Stephen Longiaru
    Abstract:
    Oomycetes are an important group of organisms with a variety of ecological roles similar to fungi. Although many are well-studied plant pathogens known for their devastating effects on agricultural systems, most are little-studied saprobes and parasites of plants and animals in nearly every ecosystem on earth. The advent of affordable...
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    Dissertation
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    , methodology, project administra- tion, software, and writing. Chapter 3: Metacoder: An R package for

  • Resistance mechanisms of Port-Orford-cedar to Phytophthora lateralis

    Creator:
    Oh, Eunsung
    Abstract:
    Breeding Port-Orford-cedar for resistance to Phytophthora lateralis, a causal agent of root disease, begins by screening, through artificial inoculation, phenotypically resistant trees selected from natural stands. The successful program selected tolerant or resistant POC parent trees for the purpose of disease management. Candidate resistant POCs were used in my dissertation...
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    Dissertation
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    root-dip inoculation; 2. test for increased virulence of P. lateralis; and 3. evaluate detection

  • Taxonomy and host specificity of the genus Agrobacterium

    Creator:
    Anderson, Arthur Robert
    Abstract:
    One hundred seventy-eight Agrobacterium isolates, 120 United States (U.S.), 26 Australian and 32 of miscellaneous origin, were characterized for their reactions to 20 biochemical and physiological tests. Isolate pathogenicity and degree of host specificity, utilization of nopaline and octopine, and sensitivity to agrocin-84 also were determined. The U.S. isolates were...
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    Dissertation
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    host. 3 Bibliography 1. Elliott, C. 1951. Agrobacterium tumefaciens, p. 6. In Manual of Bacterial

  • Understanding Host-Pathogen Interactions in the Sphaerulina musiva-Populus Pathosystem

    Creator:
    Dunnell, Kelsey Liann
    Abstract:
    Host-parasite interactions between the pathogen, Sphaerulina musiva, and its host, Populus spp., were examined in a series of studies. In the first study, variation in resistance of Populus nigra from 7 locations in Europe was differentiated based on the parameters cankers per cm and disease severity score. The analysis evaluated...
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    Dissertation
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    identify potential S. musiva effectors involved in stem canker formation at 2 and 3 weeks post

  • Sweet corn decline syndrome in Oregon's Willamette Valley

    Creator:
    Hoinacki, Elisabeth V.
    Abstract:
    For the past several years vegetable growers in Oregon's Willamette Valley have experienced reduced yields in their sweet corn plantings. We conducted studies to 1) describe the symptomology and etiology of the disease, 2) test a root rot rating system we developed to evaluate factors in the disease syndrome, and...
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    ) test a root rot rating system we developed to evaluate factors in the disease syndrome, and 3

  • Characterization, epidemiology, and ecology of a virus associated with black raspberry decline

    Creator:
    Halgren, Anne B.
    Abstract:
    The objective of this study was to characterize an unknown agent associated with decline in black raspberry (Rubus occidentalis) in Oregon. A virus was found consistently associated with decline symptoms of black raspberries and was named Black raspberry decline associated virus (BRDaV). Double stranded RNA extraction from BRDaV-infected black raspberry...
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    Dissertation
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    RNA 1 and RNA 2 are 7581 nt and 6364 nt, respectively, excluding the 3' poly(A) tails. The genome

  • Nursery, cold storage, and field studies on western conifers inoculated with spores of Pisolithus tinctorius

    Creator:
    Alvarez, Isabel Fernandez
    Abstract:
    Inoculations of white fir, Shasta red fir, Douglas fir and ponderosa pine with Pisolithus tinctorius spores when outplanted failed to produce P. tinctorius mycorrhizae at the end of the first growing season. In the third year a few P. tinctorius mycorrhizae were formed on white fir. Inoculations reduced seedling survival...
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    , (2) dipped in Truban solution, (3) dipped in Benlate solution, and (4) no treatment. Ethylene