title: Strategies in identifying  individuals in a segregant population of common bean and implications of  genotype x environment interaction in the success of selection.
abstract: The  objective of this study was to compare the BLUP selection method with different  selection strategies in F(2:4) and  assess the efficiency of this method on the early choice of the best common  bean (Phaseolus vulgaris) lines. Fifty-one F(2:4) progenies  were produced from a cross between the CVIII8511 x RP-26 lines. A randomized  block design was used with 20 replications and one-plant field plots. Character  data on plant architecture and grain yield were obtained and then the sum of the  standardized variables was estimated for simultaneous selection of both traits.  Analysis was carried out by mixed models (BLUP) and the least squares method to  compare different selection strategies, like mass selection, stratified mass  selection and between and within progeny selection. The progenies selected by  BLUP were assessed in advanced generations, always selecting the greatest and  smallest sum of the standardized variables. Analyses by the least squares  method and BLUP procedure ranked the progenies in the same way. The coincidence  of the individuals identified by BLUP and between and within progeny selection  was high and of the greatest magnitude when BLUP was compared with mass  selection. Although BLUP is the best estimator of genotypic value, its  efficiency in the response to long term selection is not different from any of  the other methods, because it is also unable to predict the future effect of  the progenies x environments interaction. It was inferred that selection  success will always depend on the most accurate possible progeny assessment and  using alternatives to reduce the progenies x environments interaction effect.
authors.affiliation: Departamento de Genética e Melhoramento de Plantas, Escola Superior de Agricultura Luiz de Queiroz, Universidades de São Paulo, Piracicaba, SP, Brasil. celapmendes@yahoo.com.br
authors.forename: M P
authors.initials: MP
authors.lastname: Mendes
authors.forename: M A P
authors.initials: MA
authors.lastname: Ramalho
authors.forename: A F B
authors.initials: AF
authors.lastname: Abreu
mesh_terms: D007887:Fabaceae / Q000235:genetics*; D005838:Genotype; D012641:Selection, Genetic