A genetic linkage map of <Emphasis Type="Italic">Phaseolus vulgaris</Emphasis> L. and localization of genes for specific resistance to six races of anthracnose (<Emphasis Type="Italic">Colletotrichum lindemuthianum</Emphasis>) |
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Authors: | Cristina Rodríguez-Suárez Belén Méndez-Vigo Astrid Pañeda Juan José Ferreira Ramón Giraldez |
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Institution: | (1) Department of Biología Funcional, University of Oviedo, 33006 Oviedo, Spain;(2) Area de Cultivos Hortofrutícolas, SERIDA, 33300 Villaviciosa (Asturias), Spain |
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Abstract: | A genetic map of common bean was constructed using 197 markers including 152 RAPDs, 32 RFLPs, 12 SCARs, and 1 morphological
marker. The map was established by using a F2 population of 85 individuals from the cross between a line derived from the Spanish landrace Andecha (Andean origin) and
the Mesoamerican genotype A252. The resulting map covers about 1,401.9 cM, with an average marker distance of 7.1 cM and includes
molecular markers linked to disease resistance genes for anthracnose, bean common mosaic virus, bean golden yellow mosaic
virus, common bacterial blight, and rust. Resistance to races 6, 31, 38, 39, 65, and 357 of the pathogenic fungus Colletotrichum lindemuthianum (anthracnose) was evaluated in F3 families derived from the corresponding F2 individuals. The intermediate resistance to race 65 proceeding from Andecha can be explained by a single dominant gene located
on linkage group B1, corresponding to the Co-1 gene. The recombination between the resistance specificities proceeding from A252 agrees with the assumption that total resistance
to races 6, 31, 38, 39, 65, and 357, is organized in two clusters. One cluster, located on B4 linkage group, includes individual
genes for specific resistance to races 6, 38, 39, and 357. The second cluster is located on linkage group B11 and includes
individual genes for specific resistance to races 6, 31, 38, 39, and 65. These two clusters correspond to genes Co-3/Co-9 and Co-2, respectively. It is concluded that most anthracnose resistance Co- genes, previously described as single major genes conferring resistance to several races, could be organized as clusters
of different genes conferring race-specific resistance.
C. Rodríguez-Suárez and B. Méndez-Vigo equally share for authorship. |
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