|VALENTINI, GISELI - Universidade Estadual De Maringá|
|GILIO, THIAGO - Universidade Estadual De Maringá|
|Quigley, Charles - Chuck|
|GONCALVES-VIDIGAL, MARIA - Universidade Estadual De Maringá|
|Pastor Corrales, Marcial - Talo|
Submitted to: Bean Improvement Cooperative Annual Report
Publication Type: Trade Journal
Publication Acceptance Date: 3/21/2018
Publication Date: 6/5/2018
Citation: Hurtado-Gonzales, O.P., Valentini, G., Gilio, T., Quigley, C.V., Song, Q., Goncalves-Vidigal, M.C., Pastor Corrales, M.A. 2018. Fine mapping of genes conferring resistance to rust and anthracnose of common bean. Bean Improvement Cooperative Annual Report. 61:27-28.
Technical Abstract: Molecular markers are essential tools for marker-assisted selection; they accelerate the development of common bean cultivars combining disease resistance genes that may provide durable resistance. Numerous published molecular markers linked to genes conferring rust and anthracnose resistance in common bean yield false positive and false negative results. Additionally, many of these markers are gel-based and labor intensive. Molecular markers closely linked to a gene of importance are indispensable for selection of resistant genotypes in breeding programs. The objective of this study was to use fine mapping to develop effective molecular markers that are closely linked to rust and anthracnose resistance genes in common. The fine mapping approach used in this study determined the precise physical location of several resistance loci. Specifically, we performed fine mapping of Andean Ur-4 and Mesoamerican Ur-3, Ur-5, and Ur-14 rust resistance genes. In addition, we completed a high-resolution mapping for the Mesoamerican anthracnose resistance locus Co-34 and the recently discovered anthracnose resistance gene in the Andean landrace Amendoim Cavalo. This gene of Andean origin, provisionally named Co-AC, confers broad resistance to highly virulent Mesoamerican races of the anthracnose pathogen. These markers will be most useful in MAS to develop bean cultivars combining two or more disease resistance genes. In addition, they will significantly reduce time and labor associated with the current phenotypic detection of these rust and anthracnose disease resistance genes.