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Genetic Mapping of QTLs Underlying Partial Resistance to Sclerotinia sclerotiorum in Soybean PI 391589A and PI 391589B

^a Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, MI 48824
^b Dep. of Plant Pathology, The Ohio State Univ., Wooster, OH 44691-4096
^c Dep. of Horticulture and Crop Science, The Ohio State Univ., Columbus, OH 43210-1086

View larger version (18K): [in this window] [in a new window]   Figure 1. Distribution of best linear unbiased predictor (BLUP) values for (A) a BC1F4:5 and (B) a BC1F4:6 populations from a cross of ‘Kottman’ x PI 391589A from an infested oat-cotyledon greenhouse assay to evaluate for resistance to Sclerotinia sclerotiorum.

View larger version (15K): [in this window] [in a new window]   Figure 2. Distribution of mean lesion lengths for a BC1F4:5 population of ‘Kottman’ x PI 391589A for the cut stem assay to measure resistance to Sclerotinia sclerotiorum.

View larger version (18K): [in this window] [in a new window]   Figure 3. Distributions of the area under disease progress curve values in the 2003 field evaluation and the 2005 greenhouse evaluation and the disease severity index values in the 2004 field evaluation of the 94 F2-derived lines from the cross PI 391589B x IA2053.

View larger version (28K): [in this window] [in a new window]   Figure 4. Log-of-odds (LOD) plots of putative quantitative trait loci (QTLs) for Sclerotinia stem rot resistance using data from (A, solid line) 2003 field, (A, dashed line; B, C) 2004 field, and (F) 2005 greenhouse in Michigan for the PI 391589B x IA2053 population. The LOD thresholds for P 0.10, obtained from 1000 permutation with the 2003, 2004, and 2005 data were 3.0, 2.4, and 3.0, respectively (shown as dotted straight lines in A, B, C, and F). For Kottman x PI 391589A populations, the putative QTLs were based on (D) lesion length data and (E) severity data obtained in the greenhouse in Ohio. The permutation-determined LOD thresholds for P < 0.05 were 1.6 and are shown as dotted straight line (D and E). 1-LOD and 2-LOD support intervals of each QTL are marked by thick and thin bars respectively between the linkage map and the plot. Map distances are in centimorgans, and the linkage groups (LGs) are named according to Song et al. (2004).