Description

A poster presented at the 2012 Global Pulse Researchers Meeting, Kigali, Rwanda- “Transforming Grain-Legume Systems to Enhance Nutrition and Livelihoods”. Abstract: The current study was conducted to map Quantitative Trait Loci (QTL) associated with drought resistance in common bean. A Recombinant Inbred Line (RIL) Population of 125 lines derived from a cross of SEA5 and CAL96 along with parents and local checks were evaluated for drought resistance in Karama station (Rwanda) and Palmira (CIAT, Colombia). SEA5 is a derivative of Durango race and is drought resistant while CAL 96 is a large seeded Calima type. Experiments were conducted in two water regimes; rainfed versus irrigated. Data were taken on number of days to flowering and maturity, number of pods per plant, seeds per pod, harvest index, pod harvest index, seed yield, seed yield per day, and 100 seeds weight. Variables tested showed significant differences between rainfed and irrigated conditions except the number of days to flowering. Mean yield averaged 1064 kg/ha under rainfed conditions and 1342 kg/ha under irrigation. The population was genotyped with 98 SSR and Indel markers, and a linkage map consisting of 11 linkage groups with a total length of 1090 cM has been produced. QTLs associated with drought resistance in common bean will facilitate the implementation of marker assisted selection for drought resistance in common bean in Rwanda.