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Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
Screening Full-Sib And Half-Sib Families Of Chestnut Seedlings For Resistance To Cryphonectria Parasitica Using A Small Stem Assay And A Leaf-Disc Assay, Uma Plambeck
Honors Theses
Cryphonectria parasitica is the ascomycete fungus species that causes chestnut blight disease. Symptoms of chestnut blight include bark cankers and eventually the death of American chestnut, Castanea dentata. However, not all Castanea species are equally affected by the disease, and some Asian species appear highly resistant. The OALDS and SSA in this study aim to assist in screening for resistance to C. parasitica within a year. We investigated the effect of C. parasitica on three North American species, one European species, four East Asian species of Castanea, and nine full-sib families of TACF backcross hybrids. Our study used both a …
The Influence Of Ectomycorrhizal Colonization On American Chestnut Trees (Castanea Dentata) With Regard To Growth, Fecundity, And Susceptibility To Chestnut Blight (Cryphonectria Parasitica)., John Adamson
Scholars Week
Ectomycorrhizal fungi (ECM) contribute to the primary productivity and biogeochemical cycling of forest ecosystems. These fungi create symbiotic relationships with plants roots, which allow for the transfer of water and nutrients to the plant and photosynthates to the fungal symbiont. The provision of water and soil nutrients are important for the establishment of seedlings in forest restoration projects. The objective of this study was to understand the relationship between ECM root colonization and tree health in disturbed soils on a reclaimed strip mine. Data were collected from 117, six-year-old trees to assess tree growth, fecundity and the tree’s susceptibility to …
Consequences Of Shifts In Abundance And Distribution Of American Chestnut For Restoration Of A Foundation Forest Tree, Harmony J. Dalgleish, Charles Dana Nelson, John A. Scrivani, Douglass F. Jacobs
Consequences Of Shifts In Abundance And Distribution Of American Chestnut For Restoration Of A Foundation Forest Tree, Harmony J. Dalgleish, Charles Dana Nelson, John A. Scrivani, Douglass F. Jacobs
Forestry and Natural Resources Faculty Publications
Restoration of foundation species, such as the American chestnut (Castanea dentata) that was devastated by an introduced fungus, can restore ecosystem function. Understanding both the current distribution as well as biogeographic patterns is important for restoration planning. We used United States Department of Agriculture Forest Service Forest Inventory and Analysis data to quantify the current density and distribution of C. dentata. We then review the literature concerning biogeographic patterns in C. dentata. Currently, 431 ± 30.2 million stems remain. The vast majority (360 ± 22 million) are sprouts < 2.5 cm dbh. Although this number is approximately 10% of the estimated pre-blight population, blight has caused a major shift in the size structure. The current-day population has a larger range, particularly west and north, likely due to human translocation. While climate change could facilitate northward expansion, limited seed reproduction makes this unlikely without assisted migration. Previous research demonstrates that the current, smaller population contains slightly higher genetic diversity than expected, although little information exists on biogeographic patterns in the genetics of adaptive traits. Our research provides a baseline characterization of the contemporary population of C. dentata, to enable monitoring stem densities …
Not Extinct: A Year In The Life Of The American Chesnut, Kristen Julina Stanfill
Not Extinct: A Year In The Life Of The American Chesnut, Kristen Julina Stanfill
Honors Theses
After the widespread infection of the American chestnut tree (Castanea dentata) due to the fungus Cryphonectria parasitica the species was nearly brought to extinction and now merely exists as stump sprouts. Since the fungus infects the bark of the tree but not the root systems new shoots are able to emerge and grow before once again being girdled by the fungus. Cryphonectria parasitica is believed to have been brought to America on Asian species of chestnut which possess resistance to the blight caused by the fungus. It is the plan of the American Chestnut Foundation (TACF) to integrate the genes …
An Oral History Of The American Chestnut In Southern Appalachia, Bethany N. Baxter
An Oral History Of The American Chestnut In Southern Appalachia, Bethany N. Baxter
Masters Theses and Doctoral Dissertations
This oral history research explored and examined the experences and memories of people who lived in the Southern Appalachian region during the years preceding and following the chestnut blight pandemic. The project examined experiences from an environmental history perspective, addressing the economic and cultural significance of chestnut pre and post blight, and attitudes and feelings concerning American chestnut restoration efforts. The American Chestnut Oral History Collection includes forty-five interviews, recorded between May and December 2008. Twenty-seven of them were recorded with people who have memories of the importance of American chestnut in southern Appalachia. These interviews were conducted across Kentucky, …
An Oral History Of The American Chestnut In Southern Appalachia Presentation, Bethany N. Baxter
An Oral History Of The American Chestnut In Southern Appalachia Presentation, Bethany N. Baxter
American Chestnut Oral History Project
Bethany Baxter's defense presentation for the thesis entitled, An oral history of the American chestnut in Southern Appalachia, submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science.
A Morphological Analysis Of A "Confounding" Population Of Castanea In Northwest Georgia, Jamie Dinkins
A Morphological Analysis Of A "Confounding" Population Of Castanea In Northwest Georgia, Jamie Dinkins
Honors Theses
Two species of Castanea Mill. (Fagacae) are native to North America: the tall, forest-type Castanea dentata (Marsh.) Borkh. and the smaller, shrubbier Castanea pumila (L.) Miller. There are two varieties of C. pumila: Castanea pumila var. pumila, and Castanea pumila var. ozarkensis (Johnson, 1988). In the early 1900s, chestnut blight caused by Cryphonectria parasitica (Murr.) Barr. reduced C. dentata to stumps and sprouts and severely diminished the abundance of both subspecies of C. pumila. Because Castanea species can apparently interbreed, restoration efforts have been complicated by possible hybridization between the two now shrubby species. One of these putative hybrid and …
American Chestnut Oral History Project Presentation And Interview Clips, Bethany N. Baxter
American Chestnut Oral History Project Presentation And Interview Clips, Bethany N. Baxter
American Chestnut Oral History Project
An interview recorded as part of the original research for the thesis entitled, An oral history of the American chestnut in Southern Appalachia, submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science.
Conversion Of Virulent Cryphonectria Parasitica From The Lula Lake Land Trust To Hypovirulent Strains, Pearl Hwang
Conversion Of Virulent Cryphonectria Parasitica From The Lula Lake Land Trust To Hypovirulent Strains, Pearl Hwang
Honors Theses
For almost a century, the fungus, Cryphonectria parasitica has existed in the United States as a wound parasite to American chestnut (Castanea dentata) trees. However, hypovirulence, evidence of spontaneous healing in Italy and Michigan, has given the American chestnut trees hope to one day be restored into its natural range. Viruses were the cause of such spontaneous healings. My hypothesis was that a viruscontaining hypovirulent strain of C. parasitica (in a brown background) would share alleles that control anastomoses with the local virulent strains, so a virus that causes hypovirulence could be transmitted into local virulent strains in vitro. Fifty …