Abstract
Maize (Zea mays L.) is a very important cereal to world-wide economy which is also true for Brazil, particularly in the South region. Grain yield and plant height have been chosen as important criteria by breeders and farmers from Santa Catarina State (SC), Brazil. The objective of this work was to estimate genetic-statistic parameters associated with genetic gain for grain yield and plant height, in the first cycle of convergent–divergent half-sib selection in a maize population (MPA1) cultivated by farmers within the municipality of Anchieta (SC). Three experiments were carried out in different small farms at Anchieta using low external agronomic inputs; each experiment represented independent samples of half-sib families, which were evaluated in randomized complete blocks with three replications per location. Significant differences among half-sib families were observed for both variables in all experiments. The expected responses to truncated selection of the 25% better families in each experiment were 5.1, 5.8 and 5.2% for reducing plant height and 3.9, 5.7 and 5.0% for increasing grain yield, respectively. The magnitudes of genetic-statistic parameters estimated evidenced that the composite population MPA1 exhibits enough genetic variability to be used in cyclical process of recurrent selection. There were evidences that the genetic structure of the base population MPA1, as indicated by its genetic variability, may lead to expressive changes in the traits under selection, even under low selection pressure.
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Acknowledgements
To Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq for the financial support. To ASSO, and particularly to the farmer Névio Alceu Folgiarini, for conceding the MPA1 population. To the SINTRAF (Anchieta-SC) and to the MPA for supporting the experiments performed at the family’s Chenet, Folgiarini and Bertolete fields trough the local technician Adriano Canci support.
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Kist, V., Bernardi Ogliari, J., de Miranda Filho, J.B. et al. Genetic potential of a maize population from Southern Brazil for the modified convergent–divergent selection scheme. Euphytica 176, 25–36 (2010). https://doi.org/10.1007/s10681-010-0207-y
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DOI: https://doi.org/10.1007/s10681-010-0207-y