Molecular markers and allelic relationships of anthracnose resistance gene cluster B4 in common bean |
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Authors: | Belén?Méndez-Vigo Cristina?Rodríguez-Suárez Astrid?Pa?eda Juan?José?Ferreira Email author" target="_blank">Ramón?GiraldezEmail author |
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Institution: | 1.Embrapa,Universidade Federal de Vi?osa,Vi?osa,Brazil;2.Instituto de Biotecnologia Aplicada à Agropecuária (BIOAGRO),Universidade Federal de Vi?osa,Vi?osa,Brazil;3.Dept. Fitotecnia,Universidade Federal de Vi?osa,Vi?osa,Brazil;4.Dept. Genética,Universidade de S?o Paulo,Ribeir?o Preto,Brazil;5.Dept. Biologia Geral,Universidade Federal de Vi?osa,Vi?osa,Brazil;6.Dept. Bioquímica e Biologia Molecular,Universidade Federal de Vi?osa,Vi?osa,Brazil |
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Abstract: | Angular leaf spot is one of the major diseases of the common bean. The extensive genetic variability of this pathogen requires
the constant development of new resistant cultivars. Different sources of resistance have been identified and characterized.
For the State of Minas Gerais, Brazil, four main resistance sources were found: Mexico 54, AND 277, MAR 2 and Cornell 49-242.
Independent characterization of these genotypes demonstrates that resistance in all four sources is dominant and monogenic.
However, there are no studies on the relationship and independence of these genes. In the present work, allelism tests were
carried out to understand the relationship among the resistance genes present in these four resistance sources. The data revealed
a much higher complexity in the resistance inheritance of these genes than previously reported. It was demonstrated that Cornell
49-242 possesses a dominant gene (Phg-3); Mexico 54 possesses three genes, denominated Phg-2, Phg-5 and Phg-6. In MAR 2, two genes were found, one independent designated Phg-4 and the other, an allelic form of Phg-5, denominated of Phg-52. Allelic forms were also found in AND 277, Phg-22, Phg-32 and Phg-42. These results have special importance for breeding programs aiming to pyramid resistance genes. |
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Keywords: | allelism tests beans disease resistance Phaeoisariopsis griseola Phaseolus vulgaris |
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