Abstract
Bean common mosaic virus and Bean common mosaic necrosis virus belong to Potyvirus and the disease poses significant threat to bean yield especially in East and Central Africa. Combining the dominant and recessive resistance genes is the most effective disease control against all known strains of the virus, a strategy to enhance the durability and stabilize the yield. The aim of the study was to transfer both the dominant I and recessive bc-3 genes into susceptible Rwandan common beans via marker-assisted backcross breeding. The markers specific for I gene (BCMV-48289723-CAPS) and for bc-3 gene (ENM-CAPS) were used for selection in BC progenies. Successful gene combination was established in 33% of BC1F1 and BC2F1, 43% of BC3F1 and 16% of BC3F2 progenies. The seed color was fully recovered on some of the BC3 progenies with combined resistance genes. The advanced lines are expected to shield the crop against both BCMV and BCMNV under East and Central African conditions.
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