Affiliation:
1. Amhara Region Agricultural Research Institute Debre Birhan Agricultural Research Center Debre Birhan Ethiopia
2. Molecular Biotech Laboratory Southern Agricultural Research Institute Hawassa Ethiopia
3. School of Plant and Horticultural Sciences, College of Agriculture Hawassa University Hawassa Ethiopia
Abstract
AbstractThe common bean (Phaseolus vulgaris L.) makes an important contribution to the human diet, particularly in Africa and Latin America. Because angular leaf spot (ALS), caused by the fungal pathogen Pseudocercospora griseola, is one of the most severe foliar diseases of the bean plant, an important priority is to identify genes encoding resistance. The present study focused on the resistance shown by the Mesoamerican common bean breeding line SPS50HB. From the pattern of segregation for resistance displayed in an F2 population bred from a cross between SPS50HB and the ALS‐susceptible Ethiopian variety Red Wolaita, it was concluded that the resistance of SPS50HB is controlled by two unlinked dominant genes. An allelism test indicated that one of these genes was either identical with, allelic to, or closely linked to the major gene Phg‐2 carried by variety Mexico 54. The sequence‐characterized amplified region assays OPEO4 and PF13, which are diagnostic for an ALS resistance gene carried by the germplasm accession G10909, both tracked a possible second gene present in SPS50HB.
Subject
Plant Science,Genetics,Agronomy and Crop Science