LINKAGE MAPPING OF THE Co-10 AND Phg-ON GENES FOR RESISTANCE TO THE ANTHRACNOSE AND ANGULAR LEAF SPOT DISEASES IN COMMONBEAN CULTIVAR OURO NEGRO

摘要

The common bean is an enormously important human food, especially in many countries of the Americas and Eastern and Southern Africa. In these countries, common bean is recognized as a very important source of protein and carbohydrate in the diet of millions of people (Broughton et al. 2003; Gepts et al. 2008). Conversely, the crop is affected byjnany biological, edaphic, and climatic factors that decrease yield (Schwartz and Pastor-Corrales 1989). Several diseases cause severe yield losses and reducethe quality of dry and snap beans worldwide (Singh and Schwartz 2010). Anthracnose (ANT), caused by Colletotrichum lindemuthianum (Sacc. and Magnus) Briosi, and Cavara) and angular leaf spot (ALS), caused by Pseudocercospora griseola (Sacc.) Crous and Braun, are among the most widespread and devastating diseases of common bean in the tropics. The Mesoamerican black-seeded common bean cultivar Ouro Negro is highly productive and it has the dominant Co-10 and Phg-ON genes that confer resistance to ANT and ALS. The objective of this study was to identify the association between the ANT Co-10 and ALS Phg-ON disease resistance genes present in cv. Ouro Negro and to identify molecular markers associated with these two genes.