Index Catalog // ScholarsArchive@OSU

Ecology and biological control of an apomictic invasive plant, Chondrilla juncea (Asteraceae)

Creator:: Campanella, Donald M.
Abstract:: A study consisting of three parts was undertaken to investigate how variation in species interactions, population genetic structure, epidemiological parameters, and plant breeding system may influence the ecology and biological control of an apomictic invasive plant, Chondrilla juncea (Asteraceae). Interactions between natural enemy species may modify their net effect on...
Resource Type:: Dissertation
Full Text:: graduate committee -- Bitty Roy, Elizabeth Borer, and Barbara Lachenbruch -- have provided indispensable

Cytokinin oxidase activity from Phaseolus vulgaris L. cv. Great Northern callus tissues

Creator:: Chatfield, J. Mark
Abstract:: Cytokinin oxidase activity in callus tissues of Phaseolus vulgaris L. cv. Great Northern has been examined using an assay based on the oxidation of radioactively labeled N⁶ -(Δ² -isopentenyl) adenine (i⁶Ade) to adenine (Ade). Conditions for the quantitative extraction and assay of the enzyme have been established. The substrate specificity...
Resource Type:: Dissertation
Full Text:: graduate student. I also wish to thank my graduate committee, Dr. David Mok, Dr. Roy Morris, Dr. Tom

Contracting nucleolar vacuoles in somatic tobacco cells growing in microcultures

Creator:: Johnson, John Morris
Abstract:: Contracting nucleolar vacuoles are a general and consistent feature of somatic tobacco cells growing in microcultures. Nucleolar vacuoles were studied in cells from callus tissues of two single-cell clones, H-196 and H-239, of hybrid tobacco (Nicotiana tabacum X N. glutinosa). Vacuoles periodically contracted either completely or incompletely, apparently releasing a...
Resource Type:: Dissertation
Full Text:: possible: The members of his committee, Dr. Henry P. Hansen, Dr. Roy A. Young, Dr. Frank H. Smith, and

Population characteristics of exotic plants in a Willamette Valley native prairie

Creator:: Lantz, Lisa E.
Resource Type:: Masters Thesis
Full Text:: invasions is readily available (Groves and Burdon 1986; Mooney and Drake 1986; Drake et al.1989; Stone et

The Role of Plant-soil Feedback in the Invasion of Brachypodium sylvaticum in Douglas-fir Forests

Creator:: Esterson, Andrew
Abstract:: Invasive plants have the capacity to transform landscapes and alter ecosystem function, causing significant economic and ecological damage. These effects include displacement and reduction of native flora and fauna, altered fire regimes, modification of biotic and abiotic soil properties, as well as local, regional, and global economic impacts. With such...
Resource Type:: Masters Thesis
Full Text:: ; Poulos and Roy 2015), modification of abiotic (Grove, Parker, and Haubensak 2015) and biotic (Mangla

Factors affecting development of iris rhizome rot caused by Botrytis convoluta Whetzel and Drayton

Creator:: Maas, J. L.
Abstract:: Abundant conidial and sclerotial production occurs on iris plants infected with Botrytis convoluta Whetzel and Drayton during the cool moist months of the year. Experiments were designed to study the survival and inoculum potential of conidia and sclerotia. Basic nutritional requirements of the fungus in culture were also studied. Results...
Resource Type:: Dissertation
Full Text:: like to thank Dr. Roy A. Young for suggesting this study. Appreciation is also extended to Dr. Frank

Efficacy and host specificity compared between two populations of the psyllid Aphalara itadori, candidates for biological control of invasive knotweeds in North America

Creator:: Grevstad, Fritzi, Shaw, Richard, Bourchier, Robert, Sanguankeo, Paolo, Cortat, Ghislaine, and Reardon, Richard C.
Abstract:: Invasive knotweeds are large perennial herbs in the Polygonaceae in the genus Fallopia that are native to Asia and invasive in North America. They include Fallopia japonica (Japanese knotweed), F. sachalinensis (giant knotweed), and a hybrid species F. x bohemica (Bohemian knotweed). Widespread throughout the continent and difficult to control...
Resource Type:: Article
Full Text:: Blossey, Eric Coombs, Roy van Driesche, Dick Casagrande, Peter McEvoy have all been generous with their

Fungi associated with Douglas-fir seed during cone development, seed processing, and storage

Creator:: Gordon, Lewin Roland
Abstract:: The Pacific Coast form of Douglas-fir in natural forest succession is an intermediate species thriving in the Coast Range and Cascade Mountains of the Pacific Northwest. This species constitutes 26 percent of the standing timber in the United States, and 24 percent of the nation's annual timber harvest. Characteristics of...
Resource Type:: Masters Thesis
Full Text:: thanks is also expressed to Dr. Roy Silen, Forestry Sciences Laboratory, U. S. Forest Service

Systematics of the genus Otidea in the Pacific Northwest

Creator:: Peterson, Eric T.
Abstract:: The fungal ascomycete genus Otidea as represented in the Pacific Northwest of North America includes eight well known species and two poorly-known species. Cladistic analysis utilizing characters from ribosomal DNA and morphology allowed the development of a robust phylogenetic species concept for Otidea. The combination of characters from the ribosomal...
Resource Type:: Masters Thesis

A revision of Juncus subgenus genuini (Juncaceae) in the Pacific states

Creator:: Lint, Harold LeRoy
Abstract:: A study was made of the subgenus Genuini of the genus Juncus in the Pacific States, California, Oregon and Washington. Extensive morphological comparisons, geographical distributions, habitat differences and observations of apparent presence or absence of natural hybrids provided the major data sources. Cytological studies were made, but were inconclusive. Eleven...
Resource Type:: Dissertation
Full Text:: the San Francisco Bay region and Del Norte Co. This usual stability leads me to suspect that subsp

ScholarsArchive@OSU

Ecology and biological control of an apomictic invasive plant, Chondrilla juncea (Asteraceae)

Cytokinin oxidase activity from Phaseolus vulgaris L. cv. Great Northern callus tissues

Contracting nucleolar vacuoles in somatic tobacco cells growing in microcultures

Population characteristics of exotic plants in a Willamette Valley native prairie

The Role of Plant-soil Feedback in the Invasion of Brachypodium sylvaticum in Douglas-fir Forests

Factors affecting development of iris rhizome rot caused by Botrytis convoluta Whetzel and Drayton

Efficacy and host specificity compared between two populations of the psyllid Aphalara itadori, candidates for biological control of invasive knotweeds in North America

Fungi associated with Douglas-fir seed during cone development, seed processing, and storage

Systematics of the genus Otidea in the Pacific Northwest

A revision of Juncus subgenus genuini (Juncaceae) in the Pacific states

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