Index Catalog // ScholarsArchive@OSU

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:: (Kamvar et al., 2014b; R Core Team, 2016). Previously, tools necessary for the analysis of clonal

Within-population genetic structure differs between two sympatric sister-species of ectomycorrhizal fungi, Rhizopogon vinicolor and R. vesiculosus

Creator:: Dunham, Susie M., Mujic, Alija Bajro, Spatafora, Joseph W., and Kretzer, Annette M.
Abstract:: Using spatial autocorrelation analysis, we examined the within-population genetic structure of Rhizopogon vinicolor and R. vesiculosus, two hypogeous ectomycorrhizal (EM) species that are sympatric sister taxa known to differ in their clonal structure. We collected 121 sporocarps and 482 tuberculate EM of both species from a 20 ha forest stand...
Resource Type:: Article
Full Text:: sympatric populations of R. vinicolor and R. vesiculosus in Oregon, Kretzer et al. (2004, 2005) demonstrated

Integration and excision of pMMC7105 in Pseudomonas syringae pv. phaseolicola occur by recombination between copies of a repetitive IS-like sequence

Creator:: Ehrenshaft, Marilyn
Resource Type:: Dissertation
Full Text:: Drs. Ralph Quatrano, George Pearson, Larry Moore, Al Ferro and Don Armstrong for serving as members

Light-induced absorbance changes and partial reactions of photosynthesis in mutants of Scenedesmus obliquus, strain D₃

Creator:: Pratt, Lee Herbert
Abstract:: Partial reactions of photosynthesis were examined in the wild type strain and six photosynthetic mutants (8, 11, 26, 40, 50, a') of Scenedesmus obliquus, strain D₃. A reproducible procedure for the isolation of active chloroplast fragments from Scenedesmus was developed. Several chloroplast reactions were examined, as well as two in...
Resource Type:: Dissertation
Full Text:: . Acknowledgment goes to Dr. R. R. Becker and to Dr. Frank Smith for serving as members of my committee and to Dr

Identification of Viruses Associated with Raspberry Leaf Curl Disease

Creator:: Guzman Martinez, Melinda
Abstract:: Raspberries are an important commodity worldwide, with the United States (U.S.) leading fourth in global production in 2017. An important factor when shipping propagated Rubus across the globe is the security of clean plant material verified through pathogen detection methods which is vital in preventing disease spread. A raspberry virus...
Resource Type:: Masters Thesis
Full Text:: ., Gettys, S., Osterbauer, N. K., Kamenidou, S., Martin, R. R., et al. 2015. Safeguarding fruit crops in

The Impact of Surface Ocean Mixing on Phytoplankton Communities and Associated Carbon Pools

Creator:: VerWey, Brian J.
Abstract:: Deep mixing events in the ocean’s surface layer act as physical drivers of carbon export by detraining dissolved and particulate organic matter, including surface phytoplankton communities, to depth. Once removed from the sunlit surface ocean environment, phytoplankton accumulation rates are dependent on the relative contributions of loss processes, such as...
Resource Type:: Masters Thesis
Full Text:: Abstract approved: ______________________________________________________ Jason R. Graff

Identification of Endogenous and Exogenous Pararetroviruses in Red Raspberry (Rubus idaeus L.) and Blueberry (Vaccinium corymbosum L.)

Creator:: Diaz Lara, Alfredo
Abstract:: The Pacific Northwest (Oregon and Washington in the United States and British Columbia in Canada) is one of the major producers of red raspberry (Rubus idaeus L.) and blueberry (Vaccinium corymbosum L.) in the world. The expansion of growing area with these crops has resulted in the emergence of new...
Resource Type:: Dissertation
Full Text:: : ______________________________________________________ Robert R. Martin The Pacific Northwest (Oregon and Washington in the

Ecological assessment after the addition of genetically engineered Klebsiella planticola SDF20 into soil

Creator:: Holmes, Michael T.
Abstract:: The objectives in this research were to assess whether Klebsiella planticola SDF20 could survive in soil and result in ecological effects to soil foodweb organisms and plant growth. Four experiments were conducted using soil microcosms. Klebsiella planticola SDF20 has been genetically engineered to produce ethanol from agricultural waste for use...
Resource Type:: Dissertation
Full Text:: . Abstract approved: Elaine R. Ingham The objectives in this research were to assess whether Klebsiella

The effects of ozone on the growth, rhizosphere population dynamics, and mycorrhizal colonization of wheat

Creator:: Kimball, Shannon M.
Resource Type:: Masters Thesis
Full Text:: : Elaine R. ngham The influence of elevated ozone exposure on plant growth has been the subject of many

Sequence determination and regional epidemiology of raspberry bushy dwarf virus (RBDV)

Creator:: Taylor, Susannah M.
Abstract:: Raspberry bushy dwarf virus (RBDV) is the sole member of the idaeovirus genus of plant viruses. It is a pollen-borne virus that economically impacts both red and black raspberries worldwide. Three strains of the bipartite RBDV have been reported. The common strain found in North America, South America, Australia, New...
Resource Type:: Masters Thesis
Full Text:: been reported on youngberry (R. loganobaccus x R. flagellaris) in South Africa (Kooyman et al., 1982

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...
Resource Type:: Dissertation
Full Text:: (Frazier et al., 1962). Converse (1972) recognized that a distinct strain of TSV, "TSV-R" infected 'Munger

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:: for privacy Abstract approved: Dr. R.-6. Hamp6n Hop tissue (ananlna 1nRu1na L.) was grown in yitig

"Big bud" disease of filbert : a descriptive cytological study of the affected plant tissues

Creator:: Larew, Hiram, 1953-
Abstract:: A light and electron microscope study of Corylus avellana L. vegetative buds infested with the eriophyoid mites, Cecidiophyopsis vermiformis Nal. and Phycoptella avellanae Nal., is reported. Descriptions are given of changes in infested stipule tissue. The nipple-like proliferations (enations) which arise on the infested stipule surface are covered by a...
Resource Type:: Masters Thesis
Full Text:: : Redacted for Privacy vFred R. Tickson A light and electron microscope study of Corylus avellana L

Qualitative changes in cytoplasmic proteins in plants treated with plant growth regulating chemicals

Creator:: Norris, L. A.
Abstract:: This thesis concerns the alteration of the course of selective protein synthesis and morphogenesis in plants treated with growth regulating chemicals. Treatment of 48-hour-old "Alaska" pea seedlings (Pisum sativum L.) with 2, 4-D, IAA, NAA or picloram caused inhibition of epicotyl and primary root elongation and proliferation of massed lateral...
Resource Type:: Dissertation
Full Text:: CHEMICALS Abstract approved: Redacted for Privacy R. 0. Morris This thesis concerns the alteration of the

Morphological and anatomical responses of selected coastal salt marsh plants to soil moisture

Creator:: Seliskar, Denise M.
Resource Type:: Masters Thesis
Full Text:: approved: Fred R. Rick on Morphological and anatomical characteristics of Deschampsia cespitosa

Location of prune dwarf and prunus necrotic ringspot viruses in sweet cherry pollen and fruit

Creator:: Kelley, Randall David
Abstract:: The location of prune dwarf virus (PDV) and Prunus necrotic ringspot virus (PNRSV) in pollen and seed from infected and healthy sweet cherry trees pollinated with infected pollen was investigated. Virus-like particles were observed in the cytoplasm of pollen grains from PDV-infected cherry trees using transmission electron microscopy. No particles...
Resource Type:: Dissertation
Full Text:: to germinate. In 1954 Gold et al. (22) reported the first direct evidence for seed and pollen

Survival of Verticillium dahliae in soil

Creator:: Carlstrom, Robert Charles, 1928-
Abstract:: Three Oregon soil types (Chehalis silt loam (CSL), an alluvial soil from the Willamette Valley; Ayre sandy loam (ASL), a volcanic pumice soil from the Central high desert; and Klamath fine sandy loam (KFSL), a basaltic mineral soil from the Klamath Basin) were collected adjacent to fields which had been...
Resource Type:: Dissertation
Full Text:: OF VERTICILLIUM DAHLIAE IN SOIL Abstract approved; Redacted for Privacy R. L. Powelson Three Oregon

The development and maturation of the Elaiosome of Dicentra formosa (Andr.) Walp

Creator:: Barnes, April E. Hootman
Abstract:: The developmental cytology of the elaiosome of Dicentra formosa (Andr.)Walp. was investigated from the time of initial differentiation until complete maturation. Light and transmission electron microscopy studies showed that the elaiosome becomes differentiated from epidermal tissue in the prefertilized ovule. At this time the cells are characterized by their large...
Resource Type:: Masters Thesis
Full Text:: / fired R. Rickson The developmental cytology of the elaiosome of Dicentra formosa (Andr.)Walp. was

New Tools for Managing Erysiphe necator: Rapid Sampling Approaches and an Exploration of Grower Opinions and Perspectives towards Collective Action and Information Transfer

Creator:: Lowder, Sarah R.
Abstract:: The scale of pest and disease dispersal is often larger than the scale of individual farms. Therefore, an individual grower’s response to pests and diseases can affect and is affected by their surrounding growing region. Individual growers are also not isolated, and engage in various forms of information gathering, sharing,...
Resource Type:: Dissertation
Full Text:: ABSTRACT OF THE DISSERTATION OF Sarah R. Lowder for the degree of Doctor of Philosophy in Botany and

The influence of pollinators on the maintenance of mixed mating in a population of the blue columbine, Aquilegia coerulea (Ranunculaceae)

Creator:: Sweet, Heather R.
Abstract:: Pollination ecology may play an important role in the maintenance of selfing in populations of self-compatible hermaphroditic plants where both selfing and outcrossing occur (mixed mating). Behavior and abundance of pollinators can influence the two major modes of selfing; autogamy (selfing within a flower) and geitonogamy (selfing between flowers on...
Resource Type:: Masters Thesis
Full Text:: OF Heather R. Sweet for the degree of Master of Science in Botany and Plant Pathology

A G-type Lectin Receptor-like Kinase Associated with Septoria Canker Resistance and Susceptibility Described using Multi-omics and Biotechnology

Creator:: Lenz, Ryan R.
Abstract:: Managers of forest and plantation ecosystems are encountering growing problems involving plant pathogens and the expanding geographic ranges of these pathogens. Historically unexposed stands are exceptionally vulnerable when a non-native pathogen is introduced because these pathogens can cause devastating disease in a host population that lacks co-evolved resistance mechanisms. One...
Resource Type:: Dissertation
Full Text:: DISSERTATION OF Ryan R. Lenz for the degree of Doctor of Philosophy in Botany and Plant Pathology

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

Characterization of the replication, incompatibility, and recombination regions of Pseudomonas syringae pv. phaseolicola plasmid pEXC8080

Creator:: Poplawsky, Alan R.
Resource Type:: Dissertation
Full Text:: Alan R. Poplawsky for the degree of Doctor of Philosophy in Botany and Plant Pathology presented on

Distribution of Phytophthora rubi and Pratylenchus penetrans in Pacific Northwest Red Raspberry (Rubus idaeus) Fields

Creator:: Kroese, Duncan R.
Abstract:: The Pacific Northwest produces over 95% of the nation’s processed red raspberries, valued at over $65 million. Two of the major soilborne pathogens effecting the production of raspberry in this region are the oomycete Phytophthora rubi, which causes root rot in red raspberry plants, and the plant-parasitic nematode Pratylenchus penetrans,...
Resource Type:: Masters Thesis
Full Text:: ABSTRACT OF THE THESIS OF Duncan R. Kroese for the degree of Master of Science in Botany and Plant

The effects of Phytophthora ramorum infection on hydraulic conductivity and tylosis formation in tanoak sapwood

Creator:: Collins, Bradley R.
Abstract:: Tanoak (Lithocarpus densiflorus), along with some other members of Fagaceae, are susceptible to sudden oak death caused by the oomycete Phytophthora ramorum. Symptoms of the disease include dying crowns, bleeding cankers, and eventually death of infected trees. The cause of mortality is not well understood, but recent research indicates that...
Resource Type:: Masters Thesis
Full Text:: Bradley R. Collins for the degree of Master of Science in Botany and Plant Pathology presented on June 3

Irrigation water and plant density effects on the epidemiology of aerial stem rot of potatoes

Creator:: Cappaert, Marlys R.
Abstract:: Field plots of cv. Russet Burbank potatoes from a single seedlot were established at four sites over two seasons (1985-86) in two locations in Oregon to determine the role of water-borne inoculum of Erwinia carotovora in plant infection. One site at each location was irrigated from a surface-water source and...
Resource Type:: Masters Thesis
Full Text:: epidemiology of aerial stem rot of potatoes AN ABSTRACT OF THE THESIS OF Marlys R. Cappaert for the degree

Role of GacSA Two-component System and Bacterial Surface Attachment in Pseudomonas syringae Virulence

Creator:: O'Malley, Megan R.
Abstract:: Pseudomonas syringae are plant pathogenic bacteria that cause disease by rapidly multiplying within the aboveground tissues of host plants. Growth of P. syringae within plant host tissues requires the disarmament of host immune defenses that limit microbial growth. To combat host defenses, P. syringae deploys a type III secretion system...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Megan R

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:: AN ABSTRACT OF THE THESIS OF Marilynn R. Bartels for the degree

Patterns of ectomycorrhizal host-fungus specificity in the Pacific Northwest

Creator:: Molina, R.
Abstract:: Results from approximately 400 fungus-host pure culture inoculations indicate that specificity of ectomycorrhizal associations is a complex phenomenon and cannot be based solely on field observations of sporocarp-host associations. Of the numerous sporocarp-host specific fungi tested, most formed ectomycorrhizae with one or more unexpected, non-associated hosts. These results conclusively demonstrate...
Resource Type:: Dissertation
Full Text:: fuscorubens + Larix occidentalis ectomycorrhiza, x175. 44 Cross section of R. fuscorubens + Picea sitchensis

Growth and reproductive ecology of Larix laricina in interior Alaska

Creator:: Brown, Kevin R.
Abstract:: Larix laricina in Alaska occurs on sites ranging from productive slopes and riverbottoms to wet bogs underlain by permafrost. It is largest on sites without permafrost, where it is associated with Picea glauca, but is much more common in bogs, where it occurs with Picea mariana. In this study, I...
Resource Type:: Masters Thesis
Full Text:: REPRODUCTIVE ECOLOGY OF LARIX LARICINA IN INTERIOR ALASKA BY KEVIN R. BROWN A THESIS Submitted to OREGON

The infection and colonization of Douglas-fir needles by the Swiss needle cast pathogen, Phaeocryptopus gaeumannii (Rhode) Petrak

Creator:: Capitano, Bryan R.
Abstract:: Phaeocryptopus gaeumannii is a pathogenic fungus on Douglas-fir needles which has become a serious threat to timber production in the last decade along the Oregon coast This research was undertaken to describe the general biology and pathology of F. gaeumannii on Douglas-fir needles and how environmental variables affect fungal development....
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Bryan R. Capitano for the degree

Resistance mechanisms against onion pink root (Pyrenochaeta terrestris), bioassay of inoculum potential in soil and chemical control

Creator:: Siemer, Sidney R.
Resource Type:: Dissertation
Full Text:: varieties. Hansen (20) considered the spores of P. terrestris to be bi- nucleate, but Struckmeyer et al

Cytotaxonomic studies in the Artemisia ludoviciana polyploid complex of the Pacific Northwest

Creator:: Estes, James R.
Abstract:: The Artemisia ludoviciana polyploid complex is a highly polymorphic assembledge of eight taxa in the Pacific Northwest, with a chromosome base number of x=9. A cytogenetic analysis of this complex was carried out to determine the sources of its variation, the types of polyploidy present, and the genetic processes active...
Resource Type:: Dissertation
Full Text:: presented .) al ( L i 1 Typed by Kay Smith for James Russell Estes ACKNOWLEDGMENT The author wishes

Examinations of Fusarium sambucinum on Humulus lupulus and co-infection with hop stunt viroid in commercial hop fields

Creator:: Cerruti, Natasha R.
Abstract:: After an unusually high incidence of Fusarium canker was observed in commercial hop fields of the Pacific Northwest, field surveys were conducted and revealed that canker incidence ranged from 20 to 60% of bines sampled in six commercial fields, as well as wide-spread Hop stunt viroid infection in these six...
Resource Type:: Masters Thesis
Full Text:: the genus Cannabis AN ABSTRACT OF THE THESIS OF Natasha R. Cerruti for the degree of

Taxonomy of Phacelia section Miltitzia (hydrophyllaceae)

Creator:: Halse, Richard R.
Abstract:: A systematic study was made of the species comprising Phacelia section Miltitzia. These species, which are commonly found in the Great Basin physiographic province of western North America, are distinguished from other members of Phacelia by their yellow, marcescent corollas and their transversely corrugated seeds. This project utilized morphological, cytological,...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE THESIS OF RICHARD R. HALSE for the degree of

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:: growth rate. Analyses of total RNA, nitrogen, protein and inorgai* r phosphorus in shoot tips of

The identity, biological and molecular characteristics and serology of carlaviruses infectious to peas in the Pacific Northwest

Creator:: Weber, Kenneth Alan
Resource Type:: Dissertation
Full Text:: extended to Drs. Donald J. Armstrong, Robert R. Becker, Richard G. Clarke, Richard H. Converse, Charles M

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

Morphology, ultrastructure and mating of sporidia of a wheat-bunt fungus, Tilletia caries (DC.) Tul.

Creator:: Kollmorgen, James Frederick
Abstract:: The teliospore of Tilletia caries germinates to produce a promycelium with a whorl of primary sporidia at its tip. The time between emergence of the promycelium and the development of primary sporidia averaged 2.3 h. Fusion between compatible sporidia occurred within an additional 3.8 h. Primary sporidia appeared to be...
Resource Type:: Dissertation
Full Text:: thanks is also extended to the other members of my graduate committee: Drs. M. H. Chaplin, W. M. Hess, R

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:: whom I may never have discovered the world of lilies and plant viruses; Drs. Fred R. Rickson and

The phytoplankton and limnological characteristics of Lago Rupanco, Osorno, Chile

Creator:: Donoso, Teresa G.
Abstract:: Lago Rupanco is located in the central plain of Chile (Borgel, 1964) at 40° 50' S; 72° 30' W. It lies at 117 m above sea level, and corresponds to type 28c of Hutchinson's (1967) classification. Lago Rupanco is a warm, monomictic lake, with winter circulation and summer stratification. Physical,...
Resource Type:: Masters Thesis
Full Text:: Redacted for Privacy Dean of Gradu School (r Date thesis is presented January 9, 1984 Typed by LaVon

A systematic and ecological study of Astragalus diaphanus (Fabaceae)

Creator:: Wright, Carolyn E.
Abstract:: Astragalus diaphanus is a rare plant endemic to the John Day River drainage of north-central Oregon. This species has several interesting features, including the dimorphism of its fruit and its geographical isolation from the two nearest taxonomically related species, which occur in Colorado. This study addressed the species' distribution and...
Resource Type:: Masters Thesis
Full Text:: . Chambers, Dr. T.C. Moore, Dr. R. Frenkel, and Dr. D. Baisted, for their interest and careful reading of

Vegetation, Bryophytes, Lichens, Environment, and Stand Dynamics in Forests of the Swan Valley, Montana

Creator:: McCune, Bruce and Antos, Joseph A.
Abstract:: We sampled vegetation, bryophytes, lichens, environment, and stand dynamics in 56 plots in the Swan Valley, Montana in 1975-1978. The data include complete inventory of trees in 375 m2 plots, with whole-plot ocular estimates of plant cover by species, transect sampling of the ground layer bryophytes and lichens with microplots,...
Resource Type:: Dataset
Full Text:: Ownership in 1977 text SiteData 5 T Township (all North) Count, unitless integer SiteData 6 R Range (all

The spatial distribution of wood-nesting ants in the central Coast Range of Oregon

Creator:: Nielsen, Gary R. (Gary Richard), 1956-
Resource Type:: Dissertation
Full Text:: Central Coast Range of Oregon AN ABSTRACT OF THE THESIS OF Gary R. Nielsen for the degree of Doctor of

Patterns in the occupancy and abundance of the globally rare lichen Erioderma pedicellatum in Denali National Park and Preserve, Alaska

Creator:: Stehn, Sarah E., Nelson, Peter R., Roland, Carl A., and Jones, Jennifer R.
Abstract:: We investigated habitat attributes related to the occupancy of the globally rare and endangered epiphytic lichen, Erioderma pedicellatum, in a newly discovered (2009) population center in Denali National Park and Preserve (DNPP), Alaska. We measured forest, tree and epiphytic lichen community characteristics on eighty-five systematically selected plots in four study...
Resource Type:: Article
Full Text:: lo t- sc al e. M ea n o r ac tu al va lu es ar e fo ll o w ed b y m in im u m -m ax

Suppression of take-all [Gaeumannomyces graminis (Sacc.) Arx & Olivier var. tritici Walker] of wheat (Triticum aestivum L.) by banded ammonium and chloride fertilizers

Creator:: Halsey, Mark Evan
Resource Type:: Dissertation
Full Text:: major professor, Dr. R. L. Powelson, this work would have been entirely impossible; I am very grateful

The effects of ultraviolet irradiation on the photosynthetic apparatus

Creator:: Mantai, Kenneth Edward
Abstract:: The effects of ultraviolet (UV) irradiation on photosynthesis and various partial reactions involving the individual photoreactions of photosynthesis were examined. These reactions included photo-reduction in adapted green algae, Hill reaction, cyclic photophosphorylation, the 520 nm absorbance change and variable-yield fluorescence. The reactions were measured in spinach chloroplasts and isolated chloroplasts...
Resource Type:: Dissertation
Full Text:: . Donald J. Reed and Dr. Robert R. Becker for critically evaluating the original draft of this thesis

Role of inoculum sources of Botrytis cinerea in the epidemiology of gray mold of snap beans

Creator:: Johnson, Kenneth Bjorn
Abstract:: Spore dispersal gradients and pod disease gradients from point inoculum sources of Botrytis cinerea were measured over time in two snap bean field experiments. Laboratory grown inoculum was placed at ground level in a 30 x 30 cm square at bloom initiation and removed at full bloom. Dispersal of inoculum,...
Resource Type:: Masters Thesis
Full Text:: my commitee members, Drs. C. E. Horner, N. W. Christensen, and R. G. Petersen for critically

Real-time RT-PCR for detection of Raspberry bushy dwarf virus, Raspberry leaf mottle virus and characterizing synergistic interactions in mixed infections

Creator:: Quito-Avila, Diego F. and Martin, Robert R.
Abstract:: Two TaqMan-based real-time One-Step RT-PCR assays were developed for the rapid and efficient detection of Raspberry bushy dwarf virus (RBDV) and Raspberry leaf mottle virus (RLMV), two of the most common raspberry viruses in North America and Europe. The primers and probes were designed from conserved fragments of the polymerase...
Resource Type:: Article
Full Text:: ′) and Act8-R (5′-GATTCCATACCCAGGAAGGADGG-3′) (Staley et al., 2010) were used to amplify a 683 bp

The glutamine synthetases in soybean root nodules and free-living Rhizobium japonicum

Creator:: Guevara, Juan Garcia
Abstract:: Glutamine synthetase activity is present in both the cytosol and bacteroid fractions of soybean root nodules. Total activity measurements indicate that at least 90% of the activity in nodules is located in the cytosol. Results reported by McParland, et al. (29), showed that many properties of glutamine synthetase from nodule...
Resource Type:: Dissertation
Full Text:: reported by McParland, et al. (29), showed that many properties of glutamine synthetase from nodule

Genomic and biological analysis of Grapevine leafroll-associated virus 7 reveals a possible new genus within the family Closteroviridae

Creator:: Al Rwahnih, Maher, Doljab, Valerian V., Dauberta, Steve, Koonin, Eugene V., and Rowhani, Adib
Abstract:: Deep sequencing analysis of an asymptomatic grapevine revealed a virome containing five RNA viruses and a viroid. Of these, Grapevine leafroll-associated virus 7 (GLRaV-7), an unassigned closterovirus, was by far the most prominently represented sequence in the analysis. Graft-inoculation of the infection to another grape variety confirmed the lack of...
Resource Type:: Article
Full Text:: members of the GLRaV- 4 subgroup (Abou Ghanem-Sabanadzovic et al., 2011; Thompson s Rese e e R s

Symbiosis in the Pacific Ring of Fire : evolutionary-biology of Rhizopogon subgenus Villosuli as mutualists of Pseudotsuga

Creator:: Mujic, Alija Bajro
Abstract:: Rhizopogon is a large genus of ectomycorrhizal (EM) fungi that grows in association with host trees of the family Pinaceae. We have conducted a series of studies investigating the ecology and evolutionary biology of the EM symbiosis shared between R. subgenus Villosuli and trees of the genus Pseudotsuga. Two members...
Resource Type:: Dissertation
Full Text:: within genus Rhizopogon (Grubisha et al. 2002). Only one Rhizopogon species outside of R. subgenus

Generation of full-length cDNA clone and functional analysis of leader proteases of grapevine leafroll-associated virus-2

Creator:: Liu, Yu-Ping
Abstract:: Papain-like leader proteases are found in diverse families of human, animal, plant, and fungal positive-strand RNA viruses. In addition to autocatalytic processing, these proteases play a variety of roles in the virus life cycle. In particular, the leader protease (L-Pro) of a prototype member of the Closterovirus genus, Beet yellows...
Resource Type:: Dissertation
Full Text:: (Soosaar et al., 2005). The nucleotide-binding (NB) site domain and adjacent sequences of R genes are

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:: and study the world’s organisms before they disappear (Ceballos et al., 2015). While the extinction

Identification and Occurrence of Sweet Cherry (Prunus avium) Virus and Virus-Like Diseases in Various Regions and Orchards of Oregon

Creator:: Reinhold, Lauri A.
Abstract:: There are over 35 known virus and virus-like diseases of sweet cherry (Prunus avium), some with potential to cause severe economic impact by reducing vegetative growth, vigor, and/or quality of fruit. Oregon is the second-ranked state for sweet cherry production in the United States with 13,000 acres and $70.8 million...
Resource Type:: Dissertation
Full Text:: changes over the years. Originally stone fruit viruses were given numerical names (Hildebrand et al

Identification of quantitative trait loci (QTL) for resistance to Fusarium crown rot (Fusarium pseudograminearum) in multiple assay environments in the Pacific Northwestern US

Creator:: Poole, G. J., Smiley, R. W., Paulitz, T. C., Walker, C. A., Carter, A. H., and See, D. R.
Abstract:: Fusarium crown rot (FCR), caused by and , reduces wheat ( L.) yields in the Pacific Northwest (PNW) of the US by as much as 35%. Resistance to FCR has not yet been discovered in currently grown PNW wheat cultivars. Several significant quantitative trait loci (QTL) for FCR resistance have...
Resource Type:: Article
Full Text:: environments in the Pacific Northwestern US G. J. Poole • R. W. Smiley • T. C. Paulitz • C. A. Walker • A. H

Enzymatic and respiratory studies on the role of cobalt in legumes

Creator:: De Hertogh, August
Resource Type:: Dissertation
Full Text:: . Nicholas et al. (76) have attempted to demonstrate a role for cobalt in R. japonicum. They showed that

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...
Resource Type:: Dissertation
Full Text:: draft, Writing – review & editing. David R Rupp: Formal analysis, Methodology, Visualization, Writing

Chemical control of hop downy mildew (Pseudoperonospora humuli) and tolerance by Phytophthora isolates to the systemic fungicide metalaxyl

Creator:: Hunger, Robert Marvin
Resource Type:: Dissertation
Full Text:: extended to Drs. T. C. Allen, R. V. Frakes, D. I. Mills, and A. J. Ferro for serving as members of my

Traits, neighbors, and species performance in prairie restoration

Creator:: Wilson, Mark V., Clark, Deborah Louise, 1950-, and Roberts, R. E.
Abstract:: Questions: Are traits related to the performance of plant species in restoration? Are the relationships between traits and performance consistent across the functional groups of annual forbs, perennial forbs, and grasses? Do the relationships between traits and performance depend on neighboring functional groups? Location: A former agricultural field, being restored...
Resource Type:: Article
Full Text:: varied greatly (Pearson’s r=0.02-0.94). Collinearity between ROBERTS, R.E. ET AL. 8 the

Carbonyl Sulfide Inhibition of CO Dehydrogenase from Rhodospirillum rubrum

Creator:: Hyman, Michael R., Ensign, Scott A., Arp, Daniel J., and Ludden, Paul W.
Abstract:: Carbonyl sulfide (COS) has been investigated as a rapid-equilibrium inhibitor of CO oxidation by the CO dehydrogenase purified from Rhodospirillum rubrum. The kinetic evidence suggests that the inhibition by COS is largely competitive versus CO (Ki = 2.3 pM) and uncompetitive versus methylviologen as electron acceptor (Ki = 15.8 pM)....
Resource Type:: Article
Full Text:: Purification. Holo CO dehydrogenase was purified from R. rubrum as described previously (Ensign et al., 1989b

Detecting continuous lichen abundance for mapping winter caribou forage at landscape spatial scales

Creator:: Nelson, Peter R., Roland, Carl, Macander, Matthew J., and McCune, Bruce
Abstract:: Spatial variation of available food resources can be difficult to accurately quantify for wide ranging organisms at landscape scales. Lichens with usnic acid, a yellowish pigment, constitute a large portion of caribou winter diet across much of their range. We take a new approach of modeling lichen abundances by capitalizing...
Resource Type:: Article
Full Text:: available at SciVerse ScienceDirect Remote Sensing of Environment j ourna l homepage: www.e lsev ie r .com

An Exploration of the Ecological and Geographical Variability of Rhizopus microsporus Clinical and Environmental Isolates

Creator:: Stairs, Brandon S.
Abstract:: Rhizopus microsporus is a globally ubiquitous opportunistic human and plant pathogen that is known to harbor endosymbiotic bacteria. Differences between populations of clinical and environmental R. microsporus isolates have yet to be assessed on a global scale. Whole-genome sequence data were used to explore fungal biology and to assess potential...
Resource Type:: Masters Thesis
Full Text:: (=oryzae), R. stolonifer, and R. microsporus (Gryganskyi et al. 2018). 1.2 Intraspecific diversity R

D-Lactate metabolism and the obligate requirement for CO2 during growth on nitrite by the facultative lithoautotroph Nitrobacter hamburgensis

Creator:: Starkenburg, Shawn R., Arp, Daniel J., and Bottomley, Peter J.
Abstract:: Nitrobacter hamburgensis X14 is a facultative lithoautotroph that conserves energy from the oxidation of nitrite (NO 2 ) and fixes carbon dioxide (CO2) as its sole source of carbon. The availability of the N. hamburgensis X14 genome sequence initiated a re-examination of its mixotrophic and organotrophic potential, as genes encoding...
Resource Type:: Article
Full Text:: CO2 during growth on nitrite by the facultative lithoautotroph Nitrobacter hamburgensis Shawn R

Acetylene Inhibition of Azotobacter vinelandii Hydrogenase: Acetylene Binds Tightly to the Large Subunit

Creator:: Sun, Jin-Hua, Hyman, Michael R., and Arp, Daniel J.
Abstract:: Acetylene is a slow-binding inhibitor of the Ni- and Fe-containing dimeric hydrogenase isolated from Azotobacter vinelandii. Acetylene was released from hydrogenase during the recovery from inhibition. This indicates that no transformation of acetylene to another compound occurred as a result of the interaction with hydrogenase. However, the release of C2H2...
Resource Type:: Article
Full Text:: , R. K. (1977) Biochim. Biophys. Von Jagow, G., & Engle, W. D. (1981) FEBS Lett. 136, Von Jagow, G

Single nucleotide polymorphism (SNP) markers associated with high folate content in wild potato species

Creator:: Bali, Sapinder, Robinson, Bruce R., Sathuvalli, Vidyasagar, Bamberg, John, and Goyer, Aymeric
Abstract:: Micronutrient deficiency, also known as the hidden hunger, affects over two billion people worldwide. Potato is the third most consumed food crops in the world, and is therefore a fundamental element of food security for millions of people. Increasing the amount of micronutrients in food crop could help alleviate worldwide...
Resource Type:: Article
Full Text:: ) markers associated with high folate content in wild potato species Sapinder Bali1☯, Bruce R. Robinson1,2

Transmission Biology of Raspberry latent virus, the First Aphid-Borne Reovirus

Creator:: Quito-Avila, Diego F., Lightle, Danielle, Lee, Jana, and Martin, Robert R.
Abstract:: Raspberry latent virus (RpLV) is a newly characterized reovirus found in commercial raspberry fields in the Pacific Northwest (PNW). Thus far, all members of the plant reoviruses are transmitted in a replicative, persistent manner by several species of leafhoppers or planthoppers. After several failed attempts to transmit RpLV using leafhoppers,...
Resource Type:: Article
Full Text:: , M., del Vas, M., Dermody, T. S., Dormitzer, P. R., et al. 2012. Reoviridae. Pages 541-630 in: Virus

Pathogenicity and Virulence of Pythium Species Obtained from Forest Nursery Soils on Douglas-Fir Seedlings

Creator:: Weiland, Jerry E., Beck, Bryan R., and Davis, Anne
Abstract:: Pythium species are common soilborne oomycetes that occur in forest nursery soils throughout the United States. Numerous species have been described from nursery soils. However, with the exception of P. aphanidermatum, P irregulare, P. sylvaticum, and P ultimum, little is known about the potential for other Pythium species found in...
Resource Type:: Article
Full Text:: E. Weiland, Bryan R. Beck, and Anne Davis, United States Department of Agriculture – Agriculture

Exploring vitamin B9 diversity in wild and primitive potatoes for modern crop improvement

Creator:: Robinson, Bruce R., Sathuvalli, Vidyasagar, Bamberg, John, and Goyer, Aymeric
Abstract:: Malnutrition is one of the world’s largest health concerns. Folate (a.k.a. vitamin B9) is essential in the human diet and without adequate folate intake several serious health concerns such as congenital birth defects and an increased risk of stroke and heart disease can occur. Most people’s folate intake remains sub-optimal...
Resource Type:: Article
Full Text:: .; Tranter, R.; Whitaker, R.; Wilkinson, C.; et al. Folate augmentation of treatment—Evaluation for

Developing Models for the Forage Ratios of Culiseta melanura and Culex erraticus using Species Characteristics for Avian Hosts

Creator:: Estep, Laura K., McClure, Christopher J. W., Burkett-Cadena, Nathan D., Hassan, Hassan K., Unnasch, Thomas R., and Hill, Geoffrey E.
Abstract:: Studies of mosquito preferences for avian hosts have found that some bird species are at greater risk than others of being fed upon by mosquitoes. The ecological factors that determine this interspecific variation in avian host use by mosquitoes have been little studied, despite the possibility that such variation may...
Resource Type:: Article
Full Text:: THOMAS R. UNNASCH,3 AND GEOFFREY E. HILL2 J. Med. Entomol. 49(2): 378Ð387 (2012); DOI: http://dx.doi.org

Parmelina yalungana resurrected and reported from Alaska, China and Russia

Creator:: Nelson, Peter R., Kepler, Ryan, Walton, James, Fankhauser, John, Nelson, Laura, and Song, Wang Li
Abstract:: Parmelina quercina is a well-studied foliose macro-lichen found on rocks and trees in the Northern Hemisphere. Recent studies support multiple species within P. quercina based on material from Europe, North America and western Asia. The identities of Parmelina quercina s.lat. reported from eastern Asia and Alaska remain unknown. We compared...
Resource Type:: Article
Full Text:: yalungana resurrected and reported from Alaska, China and Russia Author(s): Peter R. Nelson, Ryan Kepler

Phytophthora obscura sp nov., a new species of the novel Phytophthora subclade 8d

Creator:: Gruenwald, N. J., Werres, S., Goss, E. M., Taylor, C. R., and Fieland, V. J.
Abstract:: A new Phytophthora species was detected (i) in the USA, infecting foliage of Kalmia latifolia, (ii) in substrate underneath Pieris, and (iii) in Germany in soil samples underneath Aesculus hippocastanum showing disease symptoms. The new species Phytophthora obscura sp. nov. is formally named based on phylogenetic analysis, host range, Kochs...
Resource Type:: Article
Full Text:: Pflanzenschutzdienstes 47, 81–5. Werres S, Marwitz R, Veld W et al., 2001. Phytophthora ramorum sp. nov., a new

Kinetic and Spectroscopic Analysis of the Inactivating Effects of Nitric Oxide on the Individual Components of Azotobacter vinelandii Nitrogenase

Creator:: Hyman, Michael R., Seefeldt, Lance C., Morgan, Vance, Arp, Daniel J., and Mortenson, Leonard E.
Abstract:: The effects of nitric oxide (NO) on the individual components of Azotobacter vinelandii nitrogenase have been examined by kinetic and spectroscopic methods. Incubation of the Fe protein (Av2) for 1 h with stoichiometries of 4- and 8-fold molar excesses of NO to Av2 dimer resulted in a complete loss of...
Resource Type:: Article
Full Text:: vinelandii Nitrogenasef Michael R. Hyman,* Lance C. Seefeldt,$ T. Vance Morgan,$ Daniel J. Arp,* and

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...
Resource Type:: Dissertation
Full Text:: & Bruns, 2001; Bruns, 2002; Grubisha et al., 2014). Additionally, R. ellenae forms a mycorrhizal

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:: , fruits, and seeds (Peck 1961; Stuckey 1972; Hitchcock and Cronquist 1973; Baldwin et al. 2012). R

Primary productivity and community structure of an estuarine impoundment

Creator:: Lyford, John Higgins
Abstract:: An impounded estuary was employed to study primary productivity, community respiration, and community structure as they related to seasonal and temporal succession, salinity, and water temperature. Plankton metabolism was studied by means of the light-and dark-bottle technique. Benthic community metabolism was determined by using the "diurnal oxygen curve" method. Four...
Resource Type:: Dissertation
Full Text:: STRUCTURE OF AN ESTUARINE IMPOUNDMENT Abstract approved Redacted for Privacy r professor), An

Space-based lidar measurements of global ocean carbon stocks

Creator:: Behrenfeld, Michael J., Hu, Yongxiang, Hostetler, Chris A., Dall’Olmo, Giorgio, Rodier, Sharon D., Hair, John W., and Trepte, Charles R.
Abstract:: Global ocean phytoplankton biomass (C-phyto) and total particulate organic carbon (POC) stocks have largely been characterized from space using passive ocean color measurements. A space-based light detection and ranging (lidar) system can provide valuable complementary observations for C-phyto and POC assessments, with benefits including day-night sampling, observations through absorbing aerosols...
Resource Type:: Article
Full Text:: Sharon D. Rodier,2 John W. Hair,2 and Charles R. Trepte2 Received 31 July 2013; accepted 2 August 2013

Invaded range of the blackberry pathogen Phragmidium violaceum in the Pacific Northwest of the USA and the search for its provenance

Creator:: Morin, Louise, Gomez, Don R., Evans, Katherine J., Neill, Tara M., Mahaffee, Walt F., and Linde, Celeste C.
Abstract:: Field surveys in 2006 confirmed that the exotic rust fungus Phragmidium violaceum was widespread on Rubus armeniacus and Rubus laciniatus in the Pacific Northwest of the USA. The origin and dispersal pattern of this obligate biotrophic pathogen in the USA were investigated by comparing the genetic diversity and structure of...
Resource Type:: Article
Full Text:: 2 6 (I M I 3 9 3 5 5 3 ) K al o ja n o v o , B u lg ar ia R . p ro ce ru s 1 9 7 9

SNP-Based Differentiation of Phytophthora infestans Clonal Lineages Using Locked Nucleic Acid Probes and High-Resolution Melt Analysis

Creator:: Hansen, Zachariah R., Knaus, Brian J., Tabima, Javier F., Press, Caroline M., Judelson, Howard S., Grünwald, Niklaus J., and Smart, Christine D.
Abstract:: Phytophthora infestans, the cause of the devastating late blight disease of potato and tomato, exhibits a clonal reproductive lifestyle in North America. Phenotypes such as fungicide sensitivity and host preference are conserved among individuals within clonal lineages, while substantial phenotypic differences can exist between lineages. Whole P. infestans genomes were...
Resource Type:: Article
Full Text:: Zachariah R. Hansen, Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science

Genome-wide profiling of Populus small RNAs

Creator:: Klevebring, Daniel, Street, Nathaniel R., Fahlgren, Noah, Kasschau, Krisitin D., Carrington, James C., Lundeberg, Joakim, and Jansson, Stefan
Abstract:: Background: Short RNAs, and in particular microRNAs, are important regulators of gene expression both within defined regulatory pathways and at the epigenetic scale. We investigated the short RNA (sRNA) population (18-24 nt) of the transcriptome of green leaves from the sequenced Populus trichocarpa using a concatenation strategy in combination with...
Resource Type:: Article
Full Text:: AcceResearch article Genome-wide profiling of Populus small RNAs Daniel Klevebring†1, Nathaniel R Street†2

Comparative genetic structure of two mangrove species in Caribbean and Pacific estuaries of Panama

Creator:: Ceron-Souza, Ivania, Bermingham, Eldredge, McMillan, William Owen, and Jones, Frank Andrew
Abstract:: Background: Mangroves are ecologically important and highly threatened forest communities. Observational and genetic evidence has confirmed the long distance dispersal capacity of water-dispersed mangrove seeds, but less is known about the relative importance of pollen vs. seed gene flow in connecting populations. We analyzed 980 Avicennia germinans for 11 microsatellite...
Resource Type:: Article
Full Text:: ), lapis lazuli (LL) and red (R) in Pacific estuaries. ***P<0.001; **P<0.01; *P<0.05. Cerón-Souza et al

Regional to global assessments of phytoplankton dynamics from the SeaWiFS mission

Creator:: Siegel, D. A., Behrenfeld, Michael J., Maritorena, S., McClain, C. R., Antoine, D., Bailey, S. W., Bontempi, P. S., Boss, E. S., Dierssen, H. M., Doney, S. C., Eplee, R. E. Jr., Evans, R. H., Feldman, G. C., Fields, E., Franz, B. A., Kuring, N. A., Mengelt, C., Nelson, N. B., Patt, F. S., Robinson, W. D., Sarmiento, J. L., Swan, C. M., Werdell, P. J., Westberry, T. K., Wilding, J. G., and Yoder, J. A.
Abstract:: Photosynthetic production of organic matter by microscopic oceanic phytoplankton fuels ocean ecosystems and contributes roughly half of the Earth's net primary production. For 13 years, the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) mission provided the first consistent, synoptic observations of global ocean ecosystems. Changes in the surface chlorophyll concentration, the primary...
Resource Type:: Article
Full Text:: ScienceDirect Remote Sensing of Environment j ourna l homepage: www.e lsev ie r .com/ locate / rse Regional to

Ca. Nitrososphaera and Bradyrhizobium are inversely correlated and related to agricultural practices in long-term field experiments

Creator:: Zhalnina, Kateryna, de Quadros, Patricia D., Gano, Kelsey A., Davis-Richardson, Austin, Fagen, Jennie R., Brown, Christopher T., Giongo, Adriana, Drew, Jennifer C., Sayavedra-Soto, Luis A., Arp, Daniel J., Camargo, Flavio A. O., Daroub, Samira H., Clark, Ian M., McGrath, Steve P., Hirsch, Penny R., and Triplett, Eric W.
Abstract:: Agricultural land management, such as fertilization, liming, and tillage affects soil properties, including pH, organic matter content, nitrification rates, and the microbial community. Three different study sites were used to identify microorganisms that correlate with agricultural land use and to determine which factors regulate the relative abundance of the microbial...
Resource Type:: Article
Full Text:: | 11 Zhalnina et al. Key signatures for the land use the Broadbalk Wheat Experiment. Philos. T. R

High-Throughput Sequencing of Arabidopsis microRNAs : Evidence for Frequent Birth and Death of MIRNA Genes

Creator:: Fahlgren, Noah, Howell, Miya D., Kasschau, Kristin D., Sullivan, Christopher M., Cumbie, Jason S., Givan, Scott A., Law, Theresa F., Grant, Sarah R., Dangl, Jeffrey L., and Carrington, James C.
Abstract:: In plants, microRNAs (miRNAs) comprise one of two classes of small RNAs that function primarily as negative regulators at the posttranscriptional level. Several MIRNA genes in the plant kingdom are ancient, with conservation extending between angiosperms and the mosses, whereas many others are more recently evolved. Here, we use deep...
Resource Type:: Article
Full Text:: . b N u m b e r o f re ad s ar e fr o m al ll ib ra ri e s in th e A SR P (h tt p

Comparative analyses reveal potential uses of Brachypodium distachyon as a model for cold stress responses in temperate grasses

Creator:: Li, Chuan, Rudi, Heidi, Stockinger, Eric J., Cheng, Hongmei, Cao, Moju, Fox, Samuel E., Mockler, Todd C., Westereng, Bjorge, Fjellheim, Siri, Robnli, Odd Arne, and Sandve, Simen R.
Abstract:: Background: Little is known about the potential of Brachypodium distachyon as a model for low temperature stress responses in Pooideae. The ice recrystallization inhibition protein (IRIP) genes, fructosyltransferase (FST) genes, and many C-repeat binding factor (CBF) genes are Pooideae specific and important in low temperature responses. Here we used comparative...
Resource Type:: Article
Full Text:: distachyon as a model for cold stress responses in temperate grasses Li et al. BMC Plant Biology 2012, 12

Annual cycles of ecological disturbance and recovery underlying the subarctic Atlantic spring plankton bloom

Creator:: Behrenfeld, Michael J., Doney, Scott C., Lima, Ivan, Boss, Emmanuel S., and Siegel, David A.
Abstract:: Satellite measurements allow global assessments of phytoplankton concentrations and, from observed temporal changes in biomass, direct access to net biomass accumulation rates (r). For the subarctic Atlantic basin, analysis of annual cycles in r reveals that initiation of the annual blooming phase does not occur in spring after stratification surpasses...
Resource Type:: Article
Full Text:: year (i.e., r� 0 day�1) [Behrenfeld et al., 2005]. It has long been recognized that imbalances between

Some properties of ribonucleotide reductase in Rhizobium species

Creator:: Cowles, Joe Richard, 1941-
Abstract:: Ribonucleotide reductase from Rhizobium meliloti has been partially purified and characterized. The enzymatic reduction of ribonucleotides to deoxyribonucleotides is dependent upon B₁₂ coenzyme and dihydrolipoate. B₁₂ coenzyme was more effective than B₁₂ coenzyme analogues in the reductase reaction. The affinity of the R. meliloti reductase system for B₁₂ coenzyme was...
Resource Type:: Dissertation
Full Text:: more effective than B12 coenzyme ana- logues in the reductase reaction. The affinity of the R

The effects of native plants on non-native plant abundance in a restoration setting : differences among native species and the predictive ability of species traits

Creator:: Goodridge, Jennifer M.
Abstract:: Reducing the cover of non-native species is one of the challenges of ecosystem restoration. The goal of this study is to identify native species traits that will increase native species cover and reduce non-native species cover in the first growing season at upland and wetland prairie restoration sites. Native and...
Resource Type:: Masters Thesis
Full Text:: -native species. Resource demanding, weedy non-native species are examples of ruderal or r- selected

Physiologic specialization of stripe rust (Puccinia striiformis West.) in the Pacific Northwest

Creator:: Beaver, Richard Gary, 1939-
Abstract:: The physiologic specialization of nine isolates of stripe rust (Puccinia striiformis West.) collected in the Pacific Northwest was determined. The separation of races was based on the differential susceptibility of the following wheat varieties: Cappelle Desprez, Chinese 166, Dippes Triumph, Druchamp, Etoile de Choisy, Flamingo, Gaines, Golden, Ibis, Leda, Michigan...
Resource Type:: Masters Thesis
Full Text:: determination of the apparent infection rate (r) of three races of stripe rust under field conditions gave

Development and Evaluation of a 9K SNP Array for Peach by Internationally Coordinated SNP Detection and Validation in Breeding Germplasm

Creator:: Verde, Ignazio, Bassil, Nahla, Scalabrin, Simone, Gilmore, Barbara, Lawley, Cynthia T., Gasic, Ksenija, Micheletti, Diego, Rosyara, Umesh R., Cattonaro, Federica, Vendramin, Elisa, Main, Dorrie, Aramini, Valeria, Blas, Andrea L., Mockler, Todd C., Bryant, Douglas W., Wilhelm, Larry, Troggio, Michela, Sosinski, Bryon, Jose Aranzana, Maria, Arus, Pere, Iezzoni, Amy, Morgante, Michele, and Peace, Cameron
Abstract:: Correction 21 Jun 2012: Verde I, Bassil N, Scalabrin S, Gilmore B, Lawley CT, et al. (2012) Correction: Development and Evaluation of a 9K SNP Array for Peach by Internationally Coordinated SNP Detection and Validation in Breeding Germplasm. PLOS ONE 7(6): 10.1371/annotation/33f1ba92-c304-4757-91aa-555de64a0768.
Resource Type:: Article

Abandoning Sverdrup’s critical depth hypothesis on phytoplankton blooms

Creator:: Behrenfeld, Michael J.
Abstract:: The Critical Depth Hypothesis formalized by Sverdrup in 1953 posits that vernal phytoplankton blooms occur when surface mixing shoals to a depth shallower than a critical depth horizon defining the point where phytoplankton growth exceeds losses. This hypothesis has since served as a cornerstone in plankton ecology and reﬂects the...
Resource Type:: Article
Full Text:: Hassett 1982, Landry et al. 1995). Phytoplankton net specific growth rates (r) are then calculated (Eq. 3

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...
Resource Type:: Dissertation
Full Text:: indicated a significant range of correlations (r = 0.871 to r = 0.952) with significant P-values (P < 0.05

Epiphytic macrolichens in relation to forest management and topography in a western Oregon watershed

Creator:: Berryman, Shanti D.
Abstract:: This dissertation describes patterns in epiphytic macrolichen community composition, diversity, and biomass across various stand types in the Blue River watershed of western Oregon. It first examines the relative importance of ecological factors such as stand age, remnant tree retention, and topography to lichen communities in the landscape. It then...
Resource Type:: Dissertation
Full Text:: the Landscape Plan (modified from Cissel et al. 1999

Effect of kraft mill effluent on structure and function of periphyton communities

Creator:: Williams, Harvey Dean
Abstract:: Raw and biologically stabilized Kraft mill effluents were introduced into laboratory artificial streams at a ratio of 15 ml per liter of water over a two year period. Effluent from the stabilization pond of a second mill was introduced at concentrations of from 5 to 40 ml per liter of...
Resource Type:: Dissertation
Full Text:: experimental and control streams on the basis of rates of oxygen production and con- sumption, P/R ratios

Gramene database in 2010: updates and extensions

Creator:: Youens-Clark, Ken, Buckler, Ed, Casstevens, Terry, Chen, Charles, DeClerck, Genevieve, Derwent, Paul, Dharmawardhana, Palitha, Jaiswal, Pankaj, Kersey, Paul, Karthikeyan, A. S., Lu, Jerry, McCouch, Susan R., Ren, Liya, Spooner, William, Stein, Joshua C., Thomason, Jim, Wei, Sharon, and Ware, Doreen
Abstract:: Now in its 10th year, the Gramene database (http://www.gramene.org) has grown from its primary focus on rice, the first fully-sequenced grass genome, to become a resource for major model and crop plants including Arabidopsis, Brachypodium, maize, sorghum, poplar and grape in addition to several species of rice. Gramene began with...
Resource Type:: Article
Full Text:: ., Meyer,T., Muller,R., Ploetz,L. et al. (2008) The Arabidopsis Information Resource (TAIR): gene structure

Phytophthora Have Distinct Endogenous Small RNA Populations That Include Short Interfering and microRNAs

Creator:: Fahlgren, Noah, Bollmann, Stephanie R., Kasschau, Kristin D., Cuperus, Josh T., Press, Caroline M., Sullivan, Christopher M., Chapman, Elisabeth J., Hoyer, J. Steen, Gilbert, Kerrigan B., Grunwald, Niklaus J., and Carrington, James C.
Abstract:: In eukaryotes, RNA silencing pathways utilize 20-30-nucleotide small RNAs to regulate gene expression, specify and maintain chromatin structure, and repress viruses and mobile genetic elements. RNA silencing was likely present in the common ancestor of modern eukaryotes, but most research has focused on plant and animal RNA silencing systems. Phytophthora...
Resource Type:: Article
Full Text:: Small RNA Populations That Include Short Interfering and microRNAs Noah Fahlgren1,2, Stephanie R

Risk of Exposure to Eastern Equine Encephalomyelitis Virus Increases with the Density of Northern Cardinals

Creator:: Estep, Laura K., McClure, Christopher J. W., Vander Kelen, Patrick, Burkett-Cadena, Nathan D., Sickerman, Stephen, Hernandez, José, Jinright, Joseph, Hunt, Brenda, Lusk, John, Hoover, Victor, Armstrong, Keith, Stark, Lillian M., Hill, Geoffrey E., and Unnasch, Thomas R.
Abstract:: For a variety of infectious diseases, the richness of the community of potential host species has emerged as an important factor in pathogen transmission, whereby a higher richness of host species is associated with a lowered disease risk. The proposed mechanism driving this pattern is an increased likelihood in species-rich...
Resource Type:: Article
Full Text:: , Thomas R. Unnasch3 1Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon

Systematics of the genus Rhizopogon inferred from nuclear ribosomal DNA large subunit and internal transcribed spacer sequences

Creator:: Grubisha, Lisa C.
Abstract:: Rhizopogon is a hypogeous fungal genus that forms ectomycorrhizae with genera of the Pinaceae. The greatest number and species of Rhizopogon are found in coniferous forests of the Pacific Northwestern United States, where members of the Pinaceae are also concentrated. Rhizopogon spp. are host-specific primarily with Pinus spp. and Pseudotsuga...
Resource Type:: Masters Thesis
Full Text:: Glade. In section Fulviglebae, Stirps Vinicolor, Rhizopogon ochraceisporus, R. subclavitisporus, and R

Enhancement of biological control for postharvest diseases of pear

Creator:: Benbow, Jesse M.
Abstract:: Yeast biocontrol agents that were applied to 'Bose' and 'Anjou' pears in the field up to three weeks prior to harvest were found to survive on the fruit at high population levels on both pear varieties. Cryptococcus infirmo-miniatus, Cryptococcus laurentii, and Rhodotorula glutinis maintained populations averaging 5 x 10⁶ cfu/fruit...
Resource Type:: Masters Thesis
Full Text:: . infirmo-miniatus, C. laurentii, or R. glutinis led to reductions in decay in all atmospheres, with C

Distinct Argonaute-mediated 22G-RNA pathways direct genome surveillance in the C. elegans germline

Creator:: Gu, Weifeng, Shirayama, Masaki, Conte Jr., Darryl, Vasale, Jessica, Batista, Pedro J., Claycomb, Julie M., Moresco, James J., Youngman, Elaine, Keys, Jennifer, Stoltz, Matthew J., Chen, Chun-Cheih G., Chaves, Daniel A., Duan, Shenghua E., Kasschau, Krisitin D., Fahlgren, Noah, Yates III, John R., Mitani, Shohei, Carrington, James C., and Mello, Craig C.
Abstract:: Endogenous small RNAs (endo-siRNAs) interact with Argonaute (AGO) proteins to mediate sequence-specific regulation of diverse biological processes. Here, we combine deep-sequencing and genetic approaches to explore the biogenesis and function of endo-siRNAs in C. elegans. We describe conditional alleles of the dicer-related helicase, drh-3, that abrogate both RNA interference and...
Resource Type:: Article
Full Text:: R, et al. An endogenous small interfering RNA pathway in Drosophila. Nature 2008;453:798–802

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