Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Chestnut blight"”.
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Roles of tannase and hydrolyzable tannins in chestnut blight
… parasitica</u>(Murr.) Barr), the causal agent of chestnut blight, was able to grow in total aqueous and tannin extracts from blight-susceptible American chestnut as well as in blight-resistant Chinese chestnut bark extracts, from winter and summer bark. Differences in the amount of conidial …
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IDENTIFYING HIGHLY CONSERVED PATHOGENICITY GENES IN CHESTNUT BLIGHT AND POWDERY MILDEW FUNGI AS TARGETS FOR NOVEL FORMS OF HOST RESISTANCE
A bioinformatic search of the genomes of chestnut blight fungus, Cryphonectria parasitica (Cp), and the Arabidopsis powdery mildew fungus, Golovinomyces cichoracearum (Gc), yielded six suspected pathogenicity genes with homologues in both species. Deletion of these genes by homologous gene …
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Small stem assay for chestnut blight resistance in segregating half-sib and full-sib families of F2 and backcross hybrid chestnut trees
Chestnut breeders routinely screen hybrid chestnut seedling progeny for resistance to chestnut blight in an orchard setting – a process that takes five to seven years. A novel technique that allows for screening in the first and second growing season is known as a small stem assay. We screened 110 …
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FUNCTIONAL CHARACTERIZATION OF PAPAIN-LIKE PROTEASE p48 REQUIRED FOR REPLICATION OF HYPOVIRUS CHV-1 RESPONSIBLE FOR VIRULENCE-ATTENTUATION OF THE CHESTNUT BLIGHT FUNGUS
… for virulence attenuation (hypovirulence) of the chestnut blight fungus <italic>Cryphonectria parasitica</italic>, encodes two leader papain-like proteases, p29 and p48, at the N-terminus of ORF A and ORF B, respectively. Protease p29 has been shown to be dispensable for hypovirus RNA replication, …
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Population biology of Cryphonectria parasitica infected with Cryphonectria hypovirus 1 on American chestnut trees
In the early 1900's the American chestnut (Castanea dentata (Marsh.) Borkh.) was nearly destroyed by the introduction of the orange-pigmented, chestnut blight fungus (Cryphonectria parasitica (Murr.) Barr). Chestnut blight is less severe in Europe, where hypovirulent (= reduced virulence) strains …
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Biology of virulent and hypovirulent Endothia parasitica on American chestnut (Castanea dentata)
… and intact trees of large, surviving American chestnut indicated that some have heritable blight resistance. Some degree of resistance in American chestnut possibly would assist spread of hypovirulence (H) factors. The pathogenicity of the H isolate but not the V (virulent) isolate appeared to …
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Host-pathogen interactions in a segregating population of BC2F2 hybrid Castanea dentata and other chesnut hybirds after exposure to hypovirus-containing and hypvirus-free strains of Cryphonectria parasitica
… of second backcross interspecific hybrid chestnut trees (BC2F2) and the progeny of the Chattanooga Chestnut Tree Project (CCTP) breeding program were exposed to three isogenic strains of Cryphonectria parasitica. Strain Ep155 (virus-free) was used to screen the 4- 7 year old chestnut trees …
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The ManhattAnt: Identification, natural history, and nutritional ecology of a recently introduced pest in New York City, Lasius emarginatus (Hymenoptera: Formicidae)
… America’s most damaging invasive pests, from chestnut blight to the Asian long-horned beetle. Despite these cautionary examples, there has been no formal research on a newly introduced ant species that was tentatively identified as a European ant species, <em>Lasius cf. emarginatus</em>. Since …
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An oral history of the American chestnut in southern Appalachia
… 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 …
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Successive Land Surveys as Indicators of Vegetation Change in an Agricultural Landscape
… shifts in white oak (Quercus alba L.), chestnut (Castanea dentate Marsh. Borkh.), chestnut oak (Quercus prinus Wild.), black oak (Quercus velutina Lam.), red oak(Quercus rubra L.), black locust (Robinia pseudoacacia L.), yellow poplar (Liriodendron tulipifera L.), and scarlet oak …
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Age, forest structure, and disturbance history of five potential old-growth forests in eastern Kentucky's Cumberland Plateau
… debris (CWD). SC and HP likely were altered by Chestnut Blight; in addition SC appears to have been logged around the time of chestnut loss. Angel Hollow (AH) exhibits continual disturbance often seen in eastern OG due to tree-fall gaps and is similar to average OG density, volume of CWD, snags …
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Leveraging the Landsat Archive to Track Understory Evergreen Shrub Expansions in the Coweeta Basin, North Carolina
Invasive species introductions, namely the chestnut blight fungus (Cryphonectria parasitica) and hemlock woolly adelgid (Adelges tsugae), have permanently altered the overstory canopy of Appalachian forests by causing the dramatic die-offs of two ecologically significant tree species, American …
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Diversity, characteristics and potential for biological control of Sclerotinia sclerotiorum mycoviruses in New Zealand
… such as using hypoviruses to control the chestnut blight fungus Cryphonectria parasitica, and there are increasing reports of hypovirulence-mediating mycoviruses in other fungi, including S. sclerotiorum. Of the New Zealand S. sclerotiorum isolates tested, 73% contained double-stranded …
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Cultural characteristics, vegetative compatibility, and spatial pattern of white hypovirulent strains of Cryphonectria parasitica on grafted American chestnut trees
In 1982-1983, naturally formed blight cankers, within a zone ranging from the ground to 183 cm on three grafted American chestnut trees, were inoculated with a mixture of four European (white), and six, pigmented hypovirulent strains of Cryphonectria parasitica. A total of 202 C. parasitica …
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Preparing plant collections for biological invasions: a study of the effects of emerald ash borer (Agrilus planipennis Fairmaire) through case study analysis
… destruction that biological invasions like chestnut blight and Dutch elm disease have caused. In more recent years the exotic, Asian-introduced emerald ash borer (EAB; Agrilus planipennis Fairmaire) has decimated North American ash populations. If public horticulture institutions are to …
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Spread of White Hypovirulent Strains of Cryphonectria Parasitica Among American Chestnut Trees at the Lesesne State Forest
… main stems of three 16-year-old grafted American chestnut trees at the Lesesne State Forest were sampled for Cryphonectria parasitica. Cankers were sampled in 1996 and 1997 at various distances from the main stem zone on the grafts (ground to 183 cm) that was inoculated in 1982 and 1983 with a …
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Evaluating the Adaptive Genomic Landscape of Remnant and Backcross American Chestnut Populations to Inform Germplasm Conservation
The American chestnut tree (Castanea dentata) is a deciduous tree that largely exists in the eastern United States along the Appalachian Mountain range. Approximately 100 years ago, a fungal pathogen (Cryphonectria parasitica) decimated chestnut populations, resulting in the loss of billions of …