Common bacterial blight (CBB), incited by Xanthomonas axonopodis pv. phaseoli (Xap), is a major yield-limiting factor of common bean (Phaseolus valgaris L.) production around the world. Host resistance is practically the most effective and environmentally-sound approach to control CBB. Application of association mapping in QTL discovery in plant breeding programs is a promising approach to overcome some of the limitations with conventional QTL mapping strategies. The objectives of this research wereto 1) apply association mapping to identify CBB resistance QTL in Ontario bean breeding materials and 2) evaluate whether association mapping can be used effectively to discover CBB resistance QTLs using SNP genotyping of plant materials, routinely developed in a bean breeding program.
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