Rodríguez-Ortega, Diego G.

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    Análisis fenotípico y genético de la resistencia a mancha angular (Pseudocercospora griseola) en el cultivo de frijol común (Phaseolus vulgaris)
    (2017) Rodríguez-Ortega, Diego G.; Beaver, James S.; College of Agricultural Sciences; Porch, Timothy G.; Estévez de Jensen, Consuelo; Department of Crops and Agro-Environmental Sciences; Rivera, Rosita
    Common bean (Phaseolus vulgaris L.) is the most important edible grain legume in the world, as it is an important source of income for farmers and food for millions of families. Angular leaf spot (ALS), caused by the fungus Pseudocercospora griseola (Sacc.) Ferraris, is one of the most important diseases in the production of common bean with the potential to cause seed yield losses > 80%. An effective alternative to control this disease is the use of improved varieties that combine resistance genes of Andean and Mesoamerican origin. In this study, the response of 183 bean genotypes to two angular spot isolates (races 61:11 and 63:51) was evaluated. A total of 16 lines were identified with resistance to both races. The resistant lines include the Andean breeding lines CAL 143, AND 277 and the Mesoamerican cultivar ‘Ouro Negro’ that possess the resistance genes Phg-5, Phg-1, Phg-3. In addition, the reaction of recombinant inbred lines (RIL) generated from a cross between ‘Rojo’ and CAL 143, to inoculation with the races 61:11 and 63:51 was studied. Three QTL associated with ALS resistance were identified in this population. The QTLs ALS2 RC, ALS5RC and ALS11RC are located on chromosomes Pv02, Pv05, and Pv11 respectively. QTL ALS2RC and ALS11RC have not been reported in previous studies, while a QTL for ALS resistance has been reported close to the QTL ALS5RC region. The results obtained in this study indicate a quantitative inheritance pattern for angular leaf spot and that molecular marker assisted improvement can provide an advantage in genetic improvement for resistance to this disease.