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 8 of 8 for “"hypovirulent"”.
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Biology of virulent and hypovirulent Endothia parasitica on American chestnut (Castanea dentata)
… cankers arose in resistant trees or with hypovirulent fungus when slow-forming mycelial fans expanded through areas where wound periderm had not formed. Rapid epidemics of chestnut blight occur in recently clearcut areas but not in areas with large trees of species other than American …
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Effect of dsRNA-containing and dsRNA-free hypovirulent isolates of Fusarium oxysporum on severity of Fusarium seedling disease of Essex soybean
… Highly pathogenic, moderately pathogenic, and hypovirulent isolates of both species were identified. Fifty-seven <I>F. oxysporum</I> and nine <I>F. solani</I> isolates were tested for the presence of dsRNA. The presence of dsRNA was not associated with hypovirulence in <I>F. oxysporum</I> since …
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Spread of White Hypovirulent Strains of Cryphonectria Parasitica Among American Chestnut Trees at the Lesesne State Forest
… mixture of dsRNA-containing white and pigmented hypovirulent strains. Grafted trees exhibited a high level of blight control, and all bark cores extracted from cankers on the grafted trees showed superficial necrosis. Bark cores extracted from these cankers yielded 156 isolates of C. parasitica. …
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Cultural characteristics, vegetative compatibility, and spatial pattern of white hypovirulent strains of Cryphonectria parasitica on grafted American chestnut trees
… of four European (white), and six, pigmented hypovirulent strains of Cryphonectria parasitica. A total of 202 C. parasitica isolates were recovered from 49 cankers located outside of the inoculated zone. Ninety-five isolates (47%) were white and 107 (53%) were pigmented. Forty-eight vegetative …
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Population biology of Cryphonectria parasitica infected with Cryphonectria hypovirus 1 on American chestnut trees
… Chestnut blight is less severe in Europe, where hypovirulent (= reduced virulence) strains of the fungus are found to be associated with healing cankers. These European hypovirulent strains are infected with a dsRNA virus, Cryphonectria hypovirus 1 (CHV1), and have a white phenotype when grown in …
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Diversity, characteristics and potential for biological control of Sclerotinia sclerotiorum mycoviruses in New Zealand
… of virus presence, some of which had a hypovirulent phenotype. Data from Illumina sequencing showed that mycoviruses in S. sclerotiorum are more diverse than was apparent from dsRNA profiles. Twelve viral genomes were fully sequenced most of which were novel, increasing the total number …
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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
… chestnut blight disease. Two virus-containing, hypovirulent strains, Ep155(CHV1-Euro7) and Ep155(CHV1-Ep713), were used to investigate interactions of host disease resistance and expression ofhypovirulence. The BC2F2 population varied from highly susceptible to highly resistant, as measured by …
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The chemotaxonomy of the fungal genus Endothia fr.
… these organisms may be conspecific. Hypovirulent isolates of <i>E. parasitica</i> could not be distinguished from wild isolates. The banding patterns of specific isozymes were species specific; the use of isozyme analysis has great potential for future taxonomic and genetic studies. …