Hypersensitive response-like (HR-like) needle reactions to infection by the white pine blister rust pathogen, Cronartium ribicola, have been reported for several species of five needle pines native to western North America. The best-studied examples are in Pinus monticola and P. lambertiana. In these species a "needle spot" phenotype has been...
Business is a social institution and society has always designated a role for
business which has been undergoing changes with changing societal values and
paradigms. Thus while business has always had some responsibilities, the modern
connotation of the words corporate social responsibility commonly refers to business
assuming responsibilities in economic,...
Symbiosis is the close and protracted interaction between organisms. The molecular interactions that occur during symbiosis are complex with multiple barriers that must be overcome. Many Gram-negative, host-associated bacteria use a type III secretion system to mediate associations with their eukaryotic hosts. This secretion system is a specialized apparatus for...
Oomycetes are some of the most devastating pathogens, causing upwards of billions of dollars of damage each year to plants. They also diminish ecological diversity and health through the destruction of trees and shrubs. The genome sequence of Pseudoperonospora cubensis, an obligate plant pathogen and causative agent of downy mildew...
The wood products industry is influenced heavily by family ownership along the entire value chain. Although family ownership affects each link of the wood products value chain, there has been little research into the importance of products originating from family forestland. Specific attributes of products, such as origin or environmental...
Policy makers in the United States (US), following recommendations made by the international scientific community, have drafted national emissions reduction legislation in hopes of minimizing the harmful effects of global climate change. Included in this legislation is a national cap-and-trade system with provisions for carbon offsets. Specific provisions for forest...
Port-Orford-cedar (Chamaecyparis lawsoniana) is a forest tree native to
a small area of Oregon and California. A root disease caused by
Phytophthora lateralis causes widespread mortality of Port-Orford-cedar.
This dissertation examines three important elements of the Port-Orford-cedar
P. lateralis pathosystem related to breeding for disease resistance:
use of resistant rootstocks...
This thesis is a collection of four submitted manuscripts that present
methods to assist forest ecosystem service managers wanting to develop
operational sampling, monitoring, and production plans for a set of
specific quantifiable ecosystem services, which are formulated as a
series of general multi-objective optimization problems. The problems
are solved...
Colonization of N. densiflorus tissues by P. ramorum is not well understood. The pathogen is able to colonize nearly all tissues of this host but it is unclear how a tree is ultimately killed. Because this is such a destructive invasive pathogen, it is important to investigate its pathogenic strategy....
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Everett M. Hansen
Colonization of N. densiflorus tissues by P. ramorum is not well
Generally presented as a preferred social norm based on both ethical considerations and legislative demands, gender equality has been highly encouraged in recent years. For instance, The United Nations Sustainable Development Goals for 2030 call out achieving gender equality and empowerment of women. However, although there are multiple efforts to...
Studies to identify the environmental factors that influence the rate of ectotrophic mycelial growth of Phellinus weirii (Murr.) Gilbertson along Douglas-fir roots were undertaken both in the laboratory and in the field. The effects of soil pH, nitrogen, moisture, temperature, microorganisms and bulk density were investigated. In the lab, the...
Phellinus weirii (Murr.) Gilbertson, cause of laminated
root and butt rot, is a heterothallic basidiomycete lacking
clamp connections. Two biological species groups of the fungus
have been hypothesized, the Douglas-fir and cedar-types, on the
basis of physiological, morphological and epidemiological
differences. Single-spore and vegetative isolates differ in
cultural morphology, nuclear...
Phytophthora ramorum is a plant pathogen that was accidentally introduced to the United States. This invasive microorganism has killed over a million trees in California and Oregon, and continues to spread to new areas. Diseased areas have been nationally quarantined to prevent further spread and more than ninety countries include...
Symbioses are a spectrum of interactions between organisms living in closeassociation. These intimate interactions range from mutualism, in which bothorganisms benefit, to parasitism, where one organism benefits at the expense ofthe other. Horizontal gene transfer is the acquisition of genes independent ofvertical transmission and demonstrably promotes the transition of bacteria...
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Jeff H. Chang
Symbioses are a spectrum of interactions between organisms living in close
Pseudomonas syringae is a Gram-negative bacterium that can infect a variety of important crops. Infection by P. syringae is dependent on a type III secretion system (T3SS) that delivers effector proteins to plant cells to suppress host defenses. Previous work has shown that, in the presence of simple sugars, specific...
The purpose of this study was twofold. First, to determine if planned
interventions could increase untrained undergraduate students' use of positive and
specific skill feedback while a teaching fundamental motor skill to children who are
disabled. Second, to qualitatively assess the effect of specific verbal feedback on
student motor performance....
Calcium activated proteases, or calpains, are activated in cardiac muscles under conditions of ischemia/reperfusion and hypoxia. Their activity in skeletal muscle under similar conditions is poorly understood. We tested the hypothesis that hypoxia elevates calpain-mediated proteolysis in isolated glycolytic (extensor digitorum longus, EDL) and oxidative (soleus, SOL) mouse muscles studied...
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....
Described as one of the most destructive pathogens of agricultural crops and forest trees, Phytophthora is a genus of microorganisms containing over 100 known species. Phytophthora alni has caused collar and root disease in alders throughout Europe and a form of the species has recently been isolated in North America....