Theses and Dissertations at Montana State University (MSU)
Permanent URI for this collectionhttps://scholarworks.montana.edu/handle/1/733
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Item The effect of various soil amendments and preceding crops on seedling disease of sugar beets caused by Aphanomyces cochlioides Drechs(Montana State University - Bozeman, College of Agriculture, 1949) Bellingham, Roscoe C.Item Genetic analysis of the MAT-1 pheromone gene of Ustilago hordei and the study of morphogenesis during the mating response(Montana State University - Bozeman, College of Agriculture, 1999) Anderson, Cynthia MarieItem Inheritance of resistance in wheat to Septoria tritici(Montana State University - Bozeman, College of Agriculture, 1986) Ginkel, Maarten vanItem Cephalosporium stripe of winter wheat: disease processes and effects(Montana State University - Bozeman, College of Agriculture, 1967) Pool, Robert Alfred FrankItem Microbiological characterization of Montana soils suppressive and conducive to take-all disease of wheat caused by Gaemannomyces graminis var. tritici(Montana State University - Bozeman, College of Agriculture, 1992) Andrade, Orlando ArmandoItem Attenuation of pathogenicity of Helminthosporium sacchari(Montana State University - Bozeman, College of Agriculture, 1976) Pinkerton, Frederick DavidItem Etiology of Cephalosporium stripe in relation to the expression of resistance in cultivars of winter wheat (Triticum aestivum L.)(Montana State University - Bozeman, College of Agriculture, 1979) Morton, Joseph BrianItem Diclofop-methyl interactions with soil-borne fungal pathogens in wheat(Montana State University - Bozeman, College of Agriculture, 1984) Kleis, Mary M.Item Isozyme analysis of Paecilomyces farinosus and Paecilomyces fumosoroseus (Deuteromycotina: Hypomycetes), two potential biological control agents of the sweet potato and silverleaf whiteflies (Bemisia spp.)(Montana State University - Bozeman, College of Agriculture, 1995) Bunnell, Joseph E.Item Biological and chemical characterization of active metabolites produced by Pyrenophora teres(Montana State University - Bozeman, College of Agriculture, 1989) Satouri, SamiThe ethyl acetate fraction of the culture fluid of Pvrenophora teres showed a phytotoxic activity on an excised leaf of a susceptible cultivar of barley. The purification of the active metabolites involved three chromatographic methods, namely sieve size chromatography, thin layer chromatography, and high performance liquid chromatography. Three active compounds were purified. The two less active metabolites were crystallized and their structures were determined using x-ray crystallography. Both compounds are related and differ by a methoxy group on carbon #7. Pyrenoline A and Pyrenoline B are the trivial names given to these two metabolites. The third and most active compound was chemically characterized using conventional spectroscopy and was found to have the same chemical properties as Pyrenolide A, a compound that was identified by Nukina in 1980. This thesis describes the purification steps of the three compounds and their biological activities on the host plant (Hordeum vulgare sp) as well as non-host plant species. Attention was paid to Pyrenolide A. This included its production in different isolates of P. teres, its quantification, and the effect of different leaf extracts on its production. Pyrenolide A is active on a wide range of plant species including weeds. Leaf extracts from host and nonhost plants were effective in increasing toxin production in culture. Four isolates including net and spot forms, were tested for toxin production. Pyrenolide A was produced in the liquid culture of all four fungal isolates.