Index Catalog // ScholarsArchive@OSU

Reproductive isolation and interspecific hybridization in the threatened species, Sidalcea nelsoniana

Creator:: Gisler, Steven D.
Abstract:: In addition to its longstanding recognition as an influential evolutionary process, interspecific hybridization is increasingly regarded as a potential threat to the genetic integrity and survival of rare plant species, manifested through gamete wasting, increased pest and disease pressures, outbreeding depression, competitive exclusion, and genetic assimilation. Alternatively, hybridization has also...
Resource Type:: Masters Thesis

Conservation of Sidalcea nelsoniana through habitat management : effects of burning, mowing, and altered flooding regime on a rare Willamette Valley perennial

Creator:: Bartels, Marilynn R.
Abstract:: Active habitat management plays a key role in the preservation of native ecosystems and rare species, especially in the Willamette Valley of Oregon, where natural succession to woodlands threatens the few wetland prairies remaining after 150 years of agriculture and urbanization. Sidalcea nelsoniana, listed as threatened under the federal Endangered...
Resource Type:: Masters Thesis
Full Text:: Leininger, Jeremy Filip, Machelle Nelson and several student workers for suffering through long, hot days

Potential of Trichoderma sp. for inhibition of Botrytis cinerea and Sclerotinia sclerotiorum on snap beans

Creator:: Nelson, Mark E.
Abstract:: Isolates of Trichoderma spp. collected from snap bean foliage were tested for inhibition of grey mold of snap beans caused by Botrytis cinerea. In a detached blossom-pod assay an isolate of Trichoderma hamatum reduced pod rot by 94% compared to the nontreated check. Control was comparable to that obtained with...
Resource Type:: Masters Thesis
Full Text:: cinerea and Sclerotinia sclerotiorum on snap beans AN ABSTRACT OF THE THESIS OF Mark E. Nelson for the

Relationship of Pratylenchus penetrans (Cobb, 1917) population density and yield of peppermint, Mentha piperita L.

Creator:: Pinkerton, John Nelson
Abstract:: A root-lesion nematode, Pratvlenchus penetrans, was determined to be a major component of peppermint stand decline in Western Oregon. Regression analysis showed that P. penetrans root densities in August were negatively correlated (P=0.01) with yield, while soil densities in August and root and soil densities in April were poorly correlated...
Resource Type:: Dissertation
Full Text:: ) population density and yield of peppermint, Mentha piperita L. AN ABSTRACT OF THE THESIS OF JOHN NELSON

Lichen communities and caribou habitat in Denali National Park and Preserve, Alaska, USA

Creator:: Nelson, Peter R.
Abstract:: Lichens play many important roles in subarctic terrestrial ecosystems by fixing nitrogen, colonizing rock and gravel, stabilizing otherwise bare soil, adding significantly to vegetation biodiversity and serving as the primary food for caribou in the winter. In these chapters, I analyzed lichen community and ecological trait structure along environmental gradients,...
Resource Type:: Dissertation
Full Text:: . _______________________________________________________________________ AN ABSTRACT OF THE DISSERTATION OF Peter R. Nelson for the

Evaluation of hop (Humulus lupulus L.) protoplast inoculation with Prunus necrotic ringspot virus

Creator:: Jochimsen, Kenneth N.
Abstract:: Hop tissue (Humulus lupulus L.) was grown in vitro in callus, suspension, and protoplast cultures. Medium components were evaluated for optimal callus growth. Solid Murashige and Skoog (MS) medium with picloram at 1.5 uM, 6-benzylaminopurine (BAP) at 10 uM, 1 g/1 casein hydrolysate, and 100 mg/1 citric acid induced white,...
Resource Type:: Masters Thesis
Full Text:: necrotic 88 ringspot virus (NRSV) purified by a modifica- tion of Fulton's method (Dennis and Skotland

Genomic comparisons of seed-transmissible and non-seed-transmissible strains of cucumber mosaic virus

Creator:: Ried, Jeffrey L.
Abstract:: A sensitive assay for the analysis of contaminating segments in pseudorecombinants constructed from a seed-transmissible (CVM-Pg) and a non-seed-transmissible (CMV-Le) strain of cucumber mosaic virus was developed using partial RNase T₁ digestion. Isolated genomic RNA segments produced unique digestion patterns when 3'- end labeled, treated with RNase T₁, and subjected...
Resource Type:: Masters Thesis
Full Text:: /ml acridine orange for 15 minutes, followed by destaining in H o overnight at 4 C.2 Polyacrylamide

Conservation of Rorippa columbiae : an evaluation of reintroduction potential through the study of germination ecology, propagation methods, and habitat requirements

Creator:: Kentnesse, Laura E.
Abstract:: Rare plant reintroductions are a critical conservation tool for the augmentation of diminishing populations, or re-establishment of extirpated populations. Analysis of reintroduction failures suggests that a sophisticated understanding of species biology, ecology, and habitat is essential for producing self-sustaining rare plant populations. This study sought to generate that background knowledge...
Resource Type:: Masters Thesis
Full Text:: statistical testing and ecological insights. I thank Dr. Dennis Albert for his enthusiasm for playa species

Effect of iron on biological control of fire blight by Pseudomonas fluorescens A506

Creator:: Temple, Todd N.
Abstract:: Competitive exclusion has been the mechanism hypothesized to account for the biological control of fire blight disease of pear and apple by the bacterium Pseudomonas fluorescens A506 (A506). Recent laboratory assays demonstrated, however, that A506 produces an antibiotic that is toxic to the fire blight pathogen, Erwinia amylovora, when cultured...
Resource Type:: Masters Thesis
Full Text:: water ('), 0.001 (LI), 0.01 (), 0.1 (A), 1.0mM FeEDDHA (), or 0.1mM EDDHA(o) or after treatment with

Twenty-one years of secondary succession in Pseudotsuga forests of the western Cascade Range, Oregon

Creator:: Halpern, Charles B.
Resource Type:: Dissertation
Full Text:: committee, Drs. C. David Mclntire, David Nelson, David Perry, and Susan Stafford for their time and for

ScholarsArchive@OSU

Reproductive isolation and interspecific hybridization in the threatened species, Sidalcea nelsoniana

Conservation of Sidalcea nelsoniana through habitat management : effects of burning, mowing, and altered flooding regime on a rare Willamette Valley perennial

Potential of Trichoderma sp. for inhibition of Botrytis cinerea and Sclerotinia sclerotiorum on snap beans

Relationship of Pratylenchus penetrans (Cobb, 1917) population density and yield of peppermint, Mentha piperita L.

Lichen communities and caribou habitat in Denali National Park and Preserve, Alaska, USA

Evaluation of hop (Humulus lupulus L.) protoplast inoculation with Prunus necrotic ringspot virus

Genomic comparisons of seed-transmissible and non-seed-transmissible strains of cucumber mosaic virus

Conservation of Rorippa columbiae : an evaluation of reintroduction potential through the study of germination ecology, propagation methods, and habitat requirements

Effect of iron on biological control of fire blight by Pseudomonas fluorescens A506

Twenty-one years of secondary succession in Pseudotsuga forests of the western Cascade Range, Oregon

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