Browsing by Subject "Association"

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    Genetics of Rust Resistance in a Wheat Nested Association Mapping Population
    (2017-10) Manan, Fazal
    Wheat is an important food crop in many parts of the world, but its genetic diversity has been eroded due to intense selection in breeding programs. To increase genetic diversity in the Minnesota wheat breeding program, a nested association mapping population was developed by crossing 25 exotic accessions selected from the USDA-ARS Spring Wheat Core Collection with RB07, a Minnesota cultivar selected as the common parent because it has wide adaptation in the region. Virulent races of the stem rust (Puccinia graminis f. sp. tritici, Pgt), leaf rust (P. triticina, Pt), and stripe rust (P. striiformis f. sp. tritici, Pst) pathogens threaten the wheat crop in the region. Thus, the objective of this thesis was to elucidate the genetics of rust resistance in select families of the Minnesota Nested Association Mapping Population (MNAMP) based on qualitative (chi-square tests of Mendelian gene models) and quantitative (quantitative trait loci (QTL) mapping with 66,685 single nucleotide polymorphic markers) genetic analyses. Four families segregated for resistance to the widely virulent Pgt races of TTKSK, TRTTF, and TTKST. One to five Mendelian genes and five to 19 QTL conferred stem rust resistance in individual families. One family segregated for resistance to Pt race TFBGQ with Lr21 virulence. One Mendelian gene and two QTL controlled resistance to this pathogen race. Three families segregated for resistance to the Pst races PSTv-37 and PSTv-40. Three to five Mendelian genes and two to 12 QTL conferred resistance to these races in individual families. Rust resistant progeny identified from the MNAMP will be useful for enhancing the resistance of wheat to the three rust diseases.
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    Profile of 2008 Minnesota Recreational Trail Users
    (2009) Schneider, Ingrid E.; Schuweiler, Andrea; Bipes, Theresa
    In 2008, the Minnesota Recreational Trail Users Association (MRTUA) embarked on an ambitious project to simultaneously identify both the expenditures and profiles of the various trails user groups they represent. Supported by funds administered by the Minnesota Department of Natural Resources and the Carlson Chair for Travel, Tourism and Hospitality, a series of mail questionnaires were developed and administered to their MRTUA represented groups.