Search Constraints

Start Over
Filtering by: Creator Unruh, Thomas R. Remove constraint Creator: Unruh, Thomas R. Academic Affiliation Botany and Plant Pathology Remove constraint Academic Affiliation: Botany and Plant Pathology

Search Results

  • Physiology of senescence of the shoot apex in Pisum sativum L.

    Creator:
    Ecklund, Paul Richard, 1941-
    Abstract:
    Shoot apex senescence is defined as the collective progressive and deteriorative processes which ultimately terminate the functional life of the shoot apex. Senescence of shoot apices of Pisum sativum L. 'Alaska' as measured by cessation of stem elongation was delayed by removal of flowers and by treatment with gibberellin A₃...
    Resource Type:
    Dissertation
    Full Text:
    OF THE SHOOT APEX IN PISUM SATIVUM L. Abstract approved: Redacted for privacy Thomas C. Moore

  • Performance of Willamette Valley native plants following herbicide exposure

    Creator:
    Blakeley-Smith, Matthew R.
    Abstract:
    Prairies were once the dominant vegetation type in Oregon's Willamette Valley. Land use conversion, fire suppression, succession, and invasive species have reduced Willamette Valley prairies to less than 1% of their historical area. The remnant prairies that persist today are small in size and are highly fragmented. Marginal strips of...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Matthew R. Blakeley-Smith for

  • Development of in vitro lily scale budlets as related to virus elimination

    Creator:
    Ruttum, Joanne C.
    Abstract:
    Lily hybrids vary in their ability to produce virus-free (VF) bulblets when grown from virus-infected scales in tissue culture. Asiatic hybrids typically produce a higher percentage of in vitro VF scale bulblets than do Lilium longiflorum cultivars. Three hypotheses concerning the cause of this variation are tested on five lily...
    Resource Type:
    Masters Thesis
    Full Text:
    Bulblets as Related to Virus Elimination Abstract approved: -Redacted for Privacy_ Thomas C. Allen, Jr

  • Development and Application of Tools for Genetic Analysis of Clonal Populations

    Creator:
    Kamvar, Zhian N.
    Abstract:
    Research on the population genetics of microbial organisms requires the use of specialized analyses designed for clonal organisms to avoid violating the assumptions of traditional population genetic models. The tools necessary for performing these analyses existed as a set of unrelated software with non-overlapping capabilities and did not cover all...
    Resource Type:
    Dissertation
    Full Text:
    , written in the R statistical language, available on all computing platforms. This package is designed for

  • Studies on viruses isolated from roses with rose mosaic symptoms

    Creator:
    Watson, Thomas Ray
    Abstract:
    Previous work on the rose mosaic virus has produced uncertainty concerning the identity and properties of this virus. This work was undertaken to help establish the true identity of the virus and to determine some of its properties. A mechanically transmissible virus associated with rose mosaic virus disease of Rosa...
    Resource Type:
    Masters Thesis
    Full Text:
    symptoms AN ABSTRACT OF THE THESIS OF THOMAS RAY WATSON for the M. S. in Plant Pathology (Name

  • Photoinduction of kaurene synthetase, an enzyme of the gibberellin biosynthetic pathway, during de-etiolation of pea seedlings

    Creator:
    Gomez-Navarrete, Gladys
    Abstract:
    Previous investigations have shown that the enzymes catalyzing the biosynthesis of the gibberellin-type of hormones from mevalonic acid in plants are compartmentalized in plastids. Moreover, the activity of one of the key enzymes in the biosynthetic sequence, kaurene synthetase, exhibits markedly enhanced activity when a dark-grown pea seedling undergoes de-etiolation...
    Resource Type:
    Masters Thesis
    Full Text:
    DE-ETIOLATION OF PEA SEEDLINGS Abstract approved: Redacted for Privacy Thomas C. Moore Previous

  • Factors affecting establishment and germination of upland prairie species of conservation concern in the Willamette Valley, Oregon

    Creator:
    Jones, Katherine D.
    Abstract:
    Identifying mechanisms that determine who lives and dies is the first step in developing successful restoration techniques for rare species and endangered habitats. We studied interactions that affect establishment of native plant forbs of conservation concern at the seedling stage to support the theoretical basis for restoration activities in Pacific...
    Resource Type:
    Masters Thesis
    Full Text:
    :61-71. Schultz, C. B., E. Henry, A. Carleton, T. Hicks, R. Thomas, A. Potter, M. Collins, M

  • Using local climate to explain temporal variation in rare plant populations

    Creator:
    Pfingsten, Ian A.
    Abstract:
    Increased temperatures due to anthropogenic-induced climate change may raise the threat of extinction for taxa with sessile life histories (e.g., plants) in the near future. Linking climate change models to demographic models may provide useful insights into the potential effects of environmental changes on rare plants, and therefore aid in...
    Resource Type:
    Masters Thesis
    Full Text:
    : _______________________________________ Thomas N. Kaye Increased temperatures due to anthropogenic-induced climate change may raise

  • Potato virus X : detection and inter-relationship with Verticillium dahliae and Colletotrichum atramentarium

    Creator:
    Goodell, Jody Jellison
    Abstract:
    Preliminary studies were run to determine the sensitivity and reliability of enzyme-linked immunosorbent assay (ELISA) for the detection of potato virus X (PVX). ELISA was found to be capable of detecting PVX in tobacco at a 1:3333 sample dilution. The reliability of ELISA for the detection of PVX in potato...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: Redacted for privacy Thomas C. Allen Preliminary studies were run to determine the

  • A biochemical analysis of the interaction of victorin and oats

    Creator:
    Navarre, Duroy A.
    Abstract:
    Victoria blight of oats is caused by the fungus Cochhobolus victoriae. This fungus is pathogenic due to its ability to produce the host-selective toxin victorin. Previously, a 100-kD protein that binds victorin in vivo only in susceptible genotypes was identified as the P protein of the glycine decarboxylase complex (GDC)....
    Resource Type:
    Dissertation
    Full Text:
    Victorin and Oat. Abstract approved: /Thomas J. Wolpert Victoria blight of oats is caused by the