Plant Sciences Masters Papers

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    Homoeology of Thinopyrum Junceum and Elymus Rectisetus Chromosomes to Wheat and Disease Resistance Conferred by the Thinopyrum and Elymus Chromosome in Wheat
    (North Dakota State University, 2015) McArthur, Rachel Ione
    Thirteen common wheat ‘Chinese Spring’ (CS)-Thinopyrum junceum addition lines and three common wheat ‘Fukuhokomuji’(Fuku)-Elymus rectisetus addition lines were characterized and verified as disomic additions of a Th. junceum or E. rectisetus chromosome in the wheat backgrounds by fluorescent genomic in situ hybridization (FGISH). A1048 contained segregating E. rectisetus chromosomes. Seven partial CS-Th. junceum amphiploids were identified to combine Th. junceum chromosomes with CS chromosomes. Various CS-Th. junceum disomic addition lines were determined to contain Th. junceum chromosomes in homoeologous groups 1, 2, 4 and 5 by Restriction Fragment Length Polymorphism (RFLP) and storage protein analysis. The disomic addition lines A1026 and A1057 were identified to carry an E. rectisetus chromosome in group 1 and A1034 in group 5. A1048 contained E. rectisetus chromosomes from groups 1-6. Several Th. junceum chromosomes in the addition lines were found to contain genes for resistance to Fusarium head blight.
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    Investigation of a Novel Foliar Disease on Maackia amurensis in North Dakota and Its Subsequent Survey
    (North Dakota State University, 2023) Steffen, Sarah Elizabeth
    A new, undescribed pathogen was observed on Maackia amurensis (Amur maackia or Chinese yellow wood) trees in Fargo, North Dakota, over the course of four growing seasons from 2016 to 2020. Affected trees showed visual signs of necrotic lesions ringed with a yellow halo of various sizes on leaves which began in midsummer and persisted into the fall. Diseased material was collected in October 2020, from which single spore isolations were taken. After a third-party DNA analysis, the causal agent was tentatively identified as an Alternaria species. Curious about the full extent of the host and fungal pathogen, a survey was designed and distributed to horticulture industry professionals, botanical gardens, and arboreta in September 2021. The survey results showed where M. amurensis, its cultivars, and related species were growing and where similar symptoms were observed in other regions throughout the United States.