Graduate Thesis Or Dissertation
 

Transfer, characterization and mapping of white mold resistance in an advanced backcross interspecific population between Phaseolus vulgaris and Phaseolus coccineus

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8k71nk666

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  • The advanced backcross-quatitative trait loci (AB-QTL) breeding method was employed on snap bean (OR 91G x PI433251B) and dry bean (M0162 x PI433251B) interspecific populations to transfer resistance QTL from resistant donor parent Phaseolus coccineus into P. vulgaris. For OR 91G x PI433251B, analyses produced nine linkage groups corresponding to eight core linkage groups for P. vulgaris consisting of 40 markers covering 336.7 cM (approximately 28.1% of the estimated bean genome). MQM mapping revealed one QTL that was located on linkage group Pv05 (LOD of 3.2) associated with 2009 percent field severity and accounted for 6.4% of the phenotypic variation. For M0162 x PI433251B, three linkage groups were observed, corresponding to three core linkage groups for P. vulgaris and consisted of 11 markers covering 42.44 cM (approximately 3.5% of the estimated bean genome). One QTL was identified with MQM mapping on linkage group Pv02 with a LOD of 1.8 and associated with the 2009 percent field severity, and accounted for 9.8% of the phenotypic variation. Because many SSR markers with known locations on previously published common bean linkage maps were unlinked, we constructed virtual maps to order polymorphic SSRs. In conjunction with single factor analysis and the Kruskall-Wallis analysis, probable locations of QTL were identified in the absence of the traditional QTL mapping. In addition to QTL mapping, trends for interspecific populations were investigated by comparing three different populations: the two populations being reported in this document for the first time (OR 91G x PI433251B and M0162 x PI433251B) and the previously analyzed OR 91G x PI255956. The general trends for interspecific populations were severe segregation distortion attributed to overrepresentation of heterozygotes, low marker polymorphism and regions of the genome that appear to recombine infrequently.
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file details Thesis_of_Shawna_J_Zimmerman.pdf 2017-08-07 Öffentlich Herunterladen