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QTL Mapping of Resistance to Thrips palmi Karny in Common Bean

^a Centro Internacional de Agricultura Tropical, CIAT, AA 6713, Cali, Colombia
^b Institute of Plant Sciences/Applied Entomology, Swiss Federal Institute of Technology (ETH), CH-8092, Zurich, Switzerland

View larger version (54K): [in this window] [in a new window]   Fig. 1. Frequency histograms of damage and reproductive adaptation scores of recombinant inbred lines (RILs) tested for resistance to Thrips palmi in three seasons (1999A, 1999B, and 2000B). Repetitions: 1, 3, 3; number of lines: 94, 94, 48, respectively. The overall mean is indicated by a solid line. Parents BAT 881 (B) and G 21212 (G) are indicated by black triangles; the five most susceptible lines (5S), and five most resistant lines (5R) are indicated by white triangles. Resistant, intermediate, and susceptible intervals are indicated at the bottom of the figure. Means and standard errors are given in Table 3.

View larger version (44K): [in this window] [in a new window]   Fig. 2. Genetic linkage map for the BAT 881 x G 21212 population, showing linkage groups that contained significant QTLs for Thrips palmi resistance. The QTLs were identified by single interval mapping (black boxes, D99B = damage 1999B, RA99B = reproductive adaptation 1999B), by joint interval mapping for resistance traits within the same season (gray boxes, J99B = joint for damage and RA in 1999B) and by joint interval mapping for each resistance trait across three seasons (white boxes, JD3s = joint for damage across three seasons, JRA3s = joint for RA across three seasons). The LOD peaks are indicated by black horizontal bars, and their values are shown below the QTL box. Linkage group identification is according to Freyre et al. (1998) and Blair et al. (2003). The cumulative distance, in centimorgans, is shown relative to the topmost marker. Marker loci with a significant distorted segregation are marked by a black triangle.

View larger version (21K): [in this window] [in a new window]   Fig. 3. Interval mapping of a major QTL on linkage group b06 found to condition resistance to Thrips palmi in the population BAT 881 x G 21212, in the seasons 1999A, 1999B, and 2000B, using microsatellite and RAPD markers. Resistance traits are explained by letters close to the corresponding curve. Microsatellite markers are indicated in bold and the significance threshold is indicated by a line at LOD = 2.8.