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Mapping QTL for Bacterial Brown Spot Resistance under Natural Infection in Field and Seedling Stem Inoculation in Growth Chamber in Common Bean

^a Department of Plant Pathology, University of Wisconsin-Madison, WI 53706
^b Regional Agriculture Research and Development Center, Diyatalawa Road, Bandarawela, Sri Lanka
^c Department of Horticulture, University of Nebraska-Lincoln, NE 68583
^d Department of Horticulture, University of Wisconsin-Madison, WI 53706

View larger version (25K): [in a new window]   Fig. 1. RAPD marker linkage map previously constructed using F8:9 recombinant inbred lines derived from a common bean cross Belneb RR-1 x A 55. The gene and marker names are given on the right, and the length in cM shown on the right bottom of each linkage group. Markers significantly (*P < 0.05; **P < 0.01; ***P < 0.001) associated with resistance to Pseudomonas syringae pv. syringae (Pss) are indicated by boxes. The associated resistance to Pss is indicated in the boxes, with a line extending from the boxes indicating the confidence interval for interval mapping. The abbreviations of disease reactions to Pss are as follows; STEM = resistance to stem inoculations in growth chamber; BBS = plant resistance to natural infection in the field; LFA = resistance to natural infection in the field using the leaflet freezing assay to indirectly measure bacterial population sizes.

View larger version (26K): [in a new window]   Fig. 2. Frequency distributions and means of numbers of F8:9 recombinant inbred lines derived from the cross Belneb RR-1 x A 55 for disease reactions and population size of Pseudomonas syringae pv. syringae (Pss) in common bean; (A) mean ratings of stem reactions to Pss strain BS 191 based on two experiments (1 = resistant and 5 = susceptible) in a growth chamber test; (B) mean percentages of the leaves diseased per field plot based on 1996 and 1998 data; (C) mean ice freezing temperatures based on 1996 and 1998 data; this is an indirect measure of Pss population sizes associated with field-grown bean leaves.