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Mapping of QTL for Resistance to White Mold Disease in Common Bean

^a Dep. of Horticulture, Univ. of Nebraska, Lincoln, NE 68583
^b Dep. of Plant Pathology, Univ. of Nebraska, Lincoln, NE 68583
^c Life Sciences Informatics, Monsanto Company, St. Louis, MO 63167

View larger version (38K): [in a new window]   Fig. 1. Frequency distributions for greenhouse and field white mold (WM) disease caused by S. sclerotiorum, porosity over the furrow, and plant height of recombinant inbred lines derived from the common bean cross ‘PC-50’ (resistant to WM) x XAN-159 (susceptible to WM).

View larger version (37K): [in a new window]   Fig. 2. Composite interval mapping (CIM) results for identification of QTL affecting partial physiological resistance (PPR) to S. sclerotiorum isolates 279 (squares) and 152 (triangles), partial field resistance (PFR) (crosses), porosity over the furrow (POF) (filled circles), and plant height (PH) (open circles). The likelihood ratio test statistic (vertical axis) is plotted against the analysis position (cM) for each linkage group (the significance of relevent peaks are indicated in Tables 2 and 3). The locations of a subset of markers are shown for reference. Results are shown for the six linkage groups with the most significant effects. To simplify the plots, the CIM results for architectural traits are shown only for those linkage groups where significant effects were found.

View larger version (29K): [in a new window]   Fig. 3. Linkage map for the ‘PC-50’ x XAN-159 mapping population with locations of QTL identified by composite interval mapping. Bars to the left of each linkage group indicate the intervals having significant trait associations based on a comparison-wise error rate of P < 0.05. Filled bars represent traits evaluated in the present study while open bars represent traits evaluated originally in this population by Park et al. (2000) and Jung et al. (1997) for seed size and common bacterial blight traits, respectively. Arrows indicate the most likely locations of QTL based on the locations of the maximum value of the composite interval mapping likelihood ratio test statistic in each region. For traits evaluated in the present study: PPR152 and PPR279 = partial physiological resistance to S. sclerotiorum isolates 152 and 279, respectively; PFR = partial field resistance; POF = porosity over the furrow; and PH = plant height. For other traits, CBB = common bacterial blight resistance; SW = seed weight; SH = seed height; and SL = seed length. Linkage groups are named B 1-B 11 and A-K to indicate their correspondence with the map of Freyre et al. (1998) and Vallejos et al. (1999), respectively. Markers that were used directly in the integration of RFLP and RAPD maps by Freyre et al. (1998) are underlined and in bold font.