Genetic parameters and predictive genetic gain in maize with modified recurrent selection method.

Anderson Afonso Doná1, Glauco Vieira Miranda2*, Rodrigo Oliveira DeLima2, Luciana Gonçalves Chaves2, Elto Eugênio Gomes e Gama3

The modified recurrent selection method suggests a less productive population to test the other population more productive and itself aiming to have more genetic gains than tradition recurrent selection method that uses one population to test the other one. The objectives of this work were to estimate the genetic components, to predict and to evaluate the genetic gains of the SynFlint and Syndent populations of maize (Zea mays L.), applying a modified recurrent selection method. Two recombination cycles were carried out, with 144 S1 progeny per cycle. These progenies were test crossed with SynFlint, generating a SynFlint × Syndent inter-population and a SynFlint × SynFlint intra-population. The progenies were evaluated in five environments in the first cycle of selection and in three in the second cycle of selection, in a 12 × 12 lattice. Genetic variability in plant height and ear height, ear weight and prolificacy was observed in the first cycle of selection and in plant height and ear height in the second cycle. The intensity of selection practiced in the first cycle exhausted the genetic variability in ear weight and prolificacy. It can conclude that the two maize populations evaluated do not show adequate levels of genetic variability and predicted genetics gains estimates to allow their use in breeding programs to obtain lines and superior hybrids; and the modified recurrent selection method is inefficient to increase in population performance per se for the two populations.

Keywords: Zea mays, breeding methods, genetic variability.
1Agrícola Wehrmann Ltda., Brasília, Brazil.
2Universidade Federal de Viçosa, Departamento de Fitotecnia, Av. Ph Rolfs, sn, CEP 36570-000, Viçosa, Minas Gerais, Brasil. *Corresponding author (glaucovmiranda@ufv.br).
3Empresa Brasileira de Pesquisa Agropecuária EMBRAPA, Centro Nacional de Pesquisa de Milho Sorgo, Rodovia Estadual MG 424 km 45, CEP 35701-970, Sete Lagoas, Minas Gerais, Brasil.