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Genetic control of characters associated with bean golden mosaic gerninivirus resistance in Phaseolus vulgaris L.*
Luis Alberto PessoniI; Maria José de O. Zimmermann II; Josias Corrêa de FariaII
IUniversidade Federal de Goiás, Goiânia, GO, Brasil.
IIEMBRAPA, Centro Nacional de Pesquisa de Arroz e Feijão (CNPAF), Caixa Postal 179, 74001-970 Goiânia, GO, Brasil. Send correspondence to M.J.O.Z.
ABSTRACT
Bean golden mosaic is the most important viral disease of the bean crop (Phaseolus vulgaris L.) in Latin America. The genetics of resistance to a Brazilian strain of bean golden mosaic virus (BGMV), was studied in a 4 x 4 diallel cross without reciprocals, among the parental genotypes DOR 303, EMGOPA 201 Ouro, Carnaval, and Redlands Greenleaf C. Seedlings of the four parents, six F1 hybrids, 12 backcrosses, and F2 generations for each combination were inoculated on the eighth day after sowing by exposure to a viruliferous whitefly (Bemisia tabaci Genn.) population for 24 h, in a glasshouse, prior to transplantation to field conditions. The full set of two parents, F1, F2 and respective backcrosses for each combination was considered to be a family. Data were recorded and analyzed for foliar yellowing, plant dwarfing, and pod malformation, using a randomized block design, with two replications. Weighted generation mean analysis was performed for each of the six families. An additive gene action model was significant for the three characteristics evaluated. On the other hand, non-additive gene action had greater absolute value in most cases. Resistance to foliar yellowing conferred by genes from DRO 303 was highly heritable and was expressed equally well in the different genetic backgrounds evaluated. Such resistance may be oligogenic. Broad- and narrow-sense heritabilities were relatively high for all response traits. The three traits studied were all positively correlated, indicating that they can be simultaneously selected for enhancement. The highest correlation coefficient was obtained for dwarfing x pod malformation.
Keywords: mosaic gerninivirus; Phaseolus vulgaris; genetics resistance.
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* Part of a thesis presented by L.A.P. to the Universidade Federal de Goiás in partial fulfillment of the requirements for the Master's degree.