Theses and Dissertations at Montana State University (MSU)
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Item Breeding for root lesion nematode resistance in Montana winter wheat(Montana State University - Bozeman, College of Agriculture, 2015) May, David Bruce, III; Chairperson, Graduate Committee: Philip L. BrucknerRoot lesion nematodes (RLN; Pratylenchus spp.) present a serious challenge to dryland wheat production worldwide. Development of resistant cultivars would provide great economic benefit to growers. From 2012-2013, a set of backcross lines (MT08185//MT08184/Persia 20) was screened twice for resistance to P. neglectus. Progeny and parent lines were grown in infested soil for 16 to 18 weeks. Nematodes were then extracted from roots of individual plants and counted to obtain per plant final populations. ANOVA results from the 2013 screen showed significant differences in mean P. neglectus populations among lines (p < 0.01). The median final population of susceptible parent MT08184 was an estimated 4.9 times greater than that of resistant parent Persia 20. A 2013 field trial in the absence of root lesion nematodes indicated reductions in grain yield, volume weight, and protein were not associated with resistance. Seven RLN-resistant lines were identified in field evaluations with agronomic phenotypes for yield, volume weight and protein comparable to those of five widely-grown checks. Identification of quantitative trait loci (QTL) for resistance to RLN will facilitate marker-assisted introgression of resistance genes in a backcross-breeding program. Single-marker analysis of 218 genome-wide single nucleotide polymorphism markers (SNPs) was performed to identify genomic regions associated with resistance to P. neglectus. The analysis identified putative marker-trait associations on chromosomes 1AL, 1DS, 2BL, 5BL, 5DL, 7AL and 7DL (all p < 0.05). Overall, phenotypic screens as applied were inadequate to consistently characterize wheat lines for RLN resistance. As such, RLN resistance phenotypes and putative QTL effects identified in the study must be verified in future experiments.Item The effect of simulated drought on stem-stored carbohydrate characteristics in winter wheat(Montana State University - Bozeman, College of Agriculture, 1989) Sabry, Sami Reda SaberItem Cephalosporium stripe of winter wheat: disease processes and effects(Montana State University - Bozeman, College of Agriculture, 1967) Pool, Robert Alfred FrankItem 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 A comprehensive nitrogen fertilizer management model for winter wheat (Triticum aestivum L.)(Montana State University - Bozeman, College of Agriculture, 1974) Jackson, Grant D.Item Indirect selection for grain protein in winter wheat(Montana State University - Bozeman, College of Agriculture, 1988) Noaman, Maher Noaman MohamedItem Phosphorus uptake from insoluble soil sources by five forage legumes, winter wheat, and buckwheat(Montana State University - Bozeman, College of Agriculture, 1979) Jacques, Robert MarkItem The relationship of Gliadin and glutenin subunits to breadmaking characteristics in winter wheat(Montana State University - Bozeman, College of Agriculture, 1988) Al-Khawlani, Mohamed AliItem Selection for yield in F3S and F4S of two winter wheat crosses employing hill plots(Montana State University - Bozeman, College of Agriculture, 1985) Spitler, G. HollisItem The effect of Cephalosporium gramineum on yield components of various winter wheat genotypes(Montana State University - Bozeman, College of Agriculture, 1972) Johnston, Robert Howard