title: Genetic potential of common bean progenies obtained by different breeding methods evaluated in various environments.
abstract: Grain yield is strongly influenced by the environment, has polygenic and complex inheritance, and is a key trait in the selection and recommendation of cultivars. Breeding programs should efficiently explore the genetic variability resulting from crosses by selecting the most appropriate method for breeding in segregating populations. The goal of this study was to evaluate and compare the genetic potential of common bean progenies of carioca grain for grain yield, obtained by different breeding methods and evaluated in different environments. Progenies originating from crosses between lines and CNFC 7812 and CNFC 7829 were replanted up to the F7generation using three breeding methods in segregating populations: population (bulk), bulk within F2progenies, and single-seed descent (SSD). Fifteen F8progenies per method, two controls (BRS Estilo and Perola), and the parents were evaluated in a 7 x 7 simple lattice design, with plots of two 4-m rows. The tests were conducted in 10 environments in four States of Brazil and in three growing seasons in 2009 and 2010. Genetic parameters including genetic variance, heritability, variance of interaction, and expected selection gain were estimated. Genetic variability among progenies and the effect of progeny-environment interactions were determined for the three methods. The breeding methods differed significantly due to the effects of sampling procedures on the progenies and due to natural selection, which mainly affected the bulk method. The SSD and bulk methods provided populations with better estimates of genetic parameters and more stable progenies that were less affected by interaction with the environment.
authors.affiliation: Escola de Agronomia, Universidade Federal de Goiás, Goiânia, GO, Brasil.
authors.forename: V A
authors.initials: VA
authors.lastname: Pontes Júnior
authors.affiliation: Escola de Agronomia, Universidade Federal de Goiás, Goiânia, GO, Brasil.
authors.forename: P G S
authors.initials: PG
authors.lastname: Melo
authors.affiliation: Embrapa Arroz e Feijão, Santo Antônio de Goiás, GO, Brasil.
authors.forename: H S
authors.initials: HS
authors.lastname: Pereira
authors.affiliation: Embrapa Arroz e Feijão, Santo Antônio de Goiás, GO, Brasil leonardo.melo@embrapa.br.
authors.forename: L C
authors.initials: LC
authors.lastname: Melo
mesh_terms: D001938:Brazil; D003433:Crosses, Genetic; D002523:Edible Grain / Q000235:genetics*; D059647:Gene-Environment Interaction; D014644:Genetic Variation; D005838:Genotype; D027805:Phaseolus / Q000145:classification / Q000235:genetics*; D010641:Phenotype; D000069600:Plant Breeding; D012641:Selection, Genetic