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Identification and Confirmation of Quantitative Trait Loci for Root Rot Resistance in Snap Bean

Univ. of Wisconsin-Madison, Dep. of Horticulture, 1575 Linden Dr., Madison WI, 53706

View larger version (28K): [in this window] [in a new window]   Figure 1. Molecular markers associated with resistance to the root rot complex as measured by plant vigor and plant stand percent under root rot stress on the Eagle x Puebla 152 recombinant inbred line (RIL) population, Hancock, WI, 2001 to 2003. Association of these regions with quantitative trait loci (QTL) for undesirable traits for snap beans (black seed coat color and late flowering) is depicted. Black segments on linkage groups represent QTL regions, boldfaced italics are Puebla 152 marker alleles, and alleles with normal font are inherited from Eagle. AD9.950 and S18.1500 (underlined) cosegregate on linkage group 6 and are tightly associated with resistance and susceptibility to the root rot complex, respectively.

View larger version (26K): [in this window] [in a new window]   Figure 2. Regression of plant biomass and plant vigor and dependence on the presence of marker alleles AD9.950 and S18.1500 in the (a) EP recombinant inbred line (EP-RIL), (b) EEP, and (c) EPH populations.