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Filtering by: Creator Wells, Vera Lucile Remove constraint Creator: Wells, Vera Lucile Degree Field Botany and Plant Pathology Remove constraint Degree Field: Botany and Plant Pathology

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  • Conservation genetics of Kincaid's lupine : a threatened plant of western Oregon and southwest Washington grasslands

    Creator:
    Severns, Paul M.
    Abstract:
    Kincaid's lupine (Lupinus oreganus Heller) is a federally listed threatened species native to remnant grassland of western Oregon and southwestern Washington, and is the primary larval host plant of a once thought extinct butterfly, Plebejus icarioides fenderi Macy. Past studies concerning Kincaid's lupine reproduction suggested that populations may suffer reductions...
    Resource Type:
    Dissertation
    Full Text:
    . Within-lupine patch genetic diversity was well-undersampled, refuting the supposition that Kincaid’s

  • Mycorrhizal and other root endophytic fungi of lupines in the Pacific Northwest

    Creator:
    O'Dell, Thomas E.
    Abstract:
    We investigated the root endophytic fungi of lupine using four approaches: (1) occurrence of fungal colonization in field-collected roots; (2) growth response of L. latifolius to inoculation with two types of fungi; (3) structure of root colonizations of Pinus and Lupinus by Phialocephala fortinii, a septate endophytic fungus of lupine;...
    Resource Type:
    Dissertation
    Full Text:
    epidermal and cortical cells in the root hair zone on ultimate lateral pine roots, as well as cortical

  • Permineralized Mesozoic Moss Gametophytes and their Implications for Bryophyte Evolution

    Creator:
    Bippus, Alexander C.
    Abstract:
    Mosses (Phylum Bryophyta) are widely considered to be among the most ancient groups of land plants (embryophytes) and they are the second most speciose embryophyte phylum with ~13,000 extant species. Despite their diversity and antiquity, mosses have a limited fossil record, which primarily consists of gametophytes entombed in Cenozoic amber....
    Resource Type:
    Dissertation
    Full Text:
    integrating fossils into evolutionary analyses with extant plants as well as aspects of bryophyte structure

  • Is Resistance Futile: Examining Fitness Costs Associated with QoI Resistance in E. necator

    Creator:
    Newbold, Chelsea L.
    Abstract:
    Quinone outside Inhibitor (QOI) fungicides are one of the most widely used fungicide classes (FRAC 11) in the world. This popularity is the result of their ability to effectively manage a wide array of economically important pathogen species on a broad range of crops. While having mostly preventative activity, some...
    Resource Type:
    Masters Thesis
    Full Text:
    , some QoIs have been reported to have curative and limited eradicative effects, as well as direct

  • New perspectives on evolutionary relationships within Pinus (Pinaceae) and within subsection Ponderosae (subgenus Pinus)

    Creator:
    Willyard, Ann Nachreiner
    Abstract:
    A fossil-calibrated phylogenetic framework based on exemplars from each of the four taxonomic sections within Pinus was created using multiple nuclear and chloroplast loci. Calibration at the well-defined subgeneric split within Pinus with either fossil leaves and cones (ca. 45 million years ago) or fossil wood (ca. 85 million years...
    Resource Type:
    Dissertation
    Full Text:
    . Calibration at the well-defined subgeneric split within Pinus with either fossil leaves and cones (ca. 45

  • Genomic Investigations of Diversity within the Milkweed Genus Asclepias, at Multiple Scales

    Creator:
    Weitemier, Kevin A.
    Abstract:
    At a time when the biodiversity on Earth is being rapidly lost, new technologies and methods in genomic analysis are fortunately allowing scientists to catalog and explore the diversity that remains more efficiently and precisely. The studies in this dissertation investigate genomic diversity within the milkweed genus, Asclepias, at multiple...
    Resource Type:
    Dissertation
    Full Text:
    sequencing of thousands of low-copy nuclear exons and flanking regions, as well as genome skimming of high

  • Unearthing the Cretaceous Diversification of Cornales

    Creator:
    Atkinson, Brian A.
    Abstract:
    The order Cornales (dogwoods) is the earliest diverging lineage within the most diverse group of flowering plants, the asterids (>80,000 species). Although molecular phylogenetics have significantly improved our understanding of cornalean systematics, early phylogenetic relationships remain uncertain due to an initial rapid radiation. The fossil record of Cornales is extensive...
    Resource Type:
    Dissertation
    Full Text:
    diversification of Cornales and asterids was well underway by the Coniacian. In Chapter 6, the Cretaceous

  • Analysis of putative elements of plant signal transduction chains

    Creator:
    Verhey, Steven D.
    Abstract:
    The thesis begins with an introduction to signal transduction and an analysis of current understanding of plant signal transduction. There are similarities between plants and animals, but also key differences, including lack of protein kinase C and of a cAMP signaling pathway in plants, and presence in plants of calcium...
    Resource Type:
    Dissertation
    Full Text:
    counsel, as well as his technical help. Discussions with Constance White were always useful, even during