Pesquisa Agropecuária Brasileira
Print version ISSN 0100-204X
RAPOSO, FRANCISLEI VITTI; RAMALHO, MAGNO ANTÔNIO PATTO and ABREU, ANGELA DE FÁTIMA BARBOSA. Comparisons among methods to conduct segregating bean populations. Pesq. agropec. bras. [online]. 2000, vol.35, n.10, pp. 1991-1997. ISSN 0100-204X. http://dx.doi.org/10.1590/S0100-204X2000001000010.
The efficiency of five methods of conduction of segregating populations was compared in common beans. For this experiment, the segregating population from cross between the cultivars Carioca and Flor de Mayo was used. The methods pedigree, bulk, single seed descent (SSD), F3 derived bulk and F2 derived bulk were conducted as established for each method. They were evaluated in two locations, Lavras, in the south of Minas Gerais, and in Patos de Minas, located in the Alto São Francisco region. Utilizing a 18 x 18 triple lattice design, 320 families were evaluated, with 64 being derived from each method, with the parents and two other checks. Estimatives were obtained from genetic and phenotypic parameters for grain yield data (g/plots). The main criteria utilized to compare the breeding methods were the average performance of the families, the expected response with different selection intensities, and the number of families in each method with superior performance to a particular standard. There were no significant differences between the methods to obtain the superior families, that is, if correctly conducted, all the methods enable similar success with the selection. Considering the estimatives of the genetic and phenotypic parameters, together with the ease and flexibility of conduction, the bulk and SSD method proved to be the most advantageous.
Keywords : Phaseolus vulgaris; crossbreeding; cultivars; heritability; segregation; genetic variation; quantitative genetic; breeding methods; plant breeding.