ciclos de seleção de progênies de meios-irmãos do milho br 5011 sertanejo selection cycles of half-sib families for the maize variety br 5011 sertanejo
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2007
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Abstract
O objetivo deste trabalho foi obter estimativas de parâmetros genéticos da variedade BR 5011 Sertanejo, a fim de se avaliar o comportamento da variabilidade genética, no decorrer de sucessivos ciclos de seleção. Dezessete ciclos de seleção, entre e dentro de progênies de meios-irmãos, e três ciclos de seleção massal estratificada foram praticados nessa variedade de milho, no período de 1985 a 2005. Nos três primeiros ciclos de seleção, entre e dentro de progênies de meios-irmãos, as progênies foram avaliadas em látice 10x10, e entre os ciclos 4 e 17, as avaliações foram realizadas em látice 14x14. Os ensaios foram realizados nos municípios de Gararu, Propriá, Poço Verde, Neópolis, Lagarto e Nossa Senhora das Dores, no Estado de Sergipe, e em Cruz das Almas na Bahia. As parcelas constaram de fileiras de 5 m, espaçadas de 0,8 m, com 0,4 m entre covas dentro das fileiras. As recombinações das progênies superiores foram realizadas dentro do mesmo ano agrícola, de modo a se obter um ciclo por ano. A variedade BR 5011 Sertanejo apresentou alto potencial produtivo, associado a uma ampla base genética. A magnitude da interação progênies x locais evidenciou a importância de se avaliar a produtividade em mais de um local para melhorar a eficiência do processo seletivo e para se obterem estimativas mais consistentes dos componentes da variância.
The objective of this work was to estimate the genetic parameters of the maize variety BR 5011 Sertanejo, in order to evaluate the behavior of the genetic variability along successive selection cycles. Seventeen between- and within-half-sib family selection cycles and three stratified mass selections were carried out for this maize variety, between 1985 and 2005. In the three first selection cycles of between- and within-half-sib families, families were evaluated using a 10x10 lattice, whereas for the reminder of the cycles, a 14x14 lattice was employed. The assays were carried out in the municipalities of Gararu, Propriá, Poço Verde, Neópolis, Lagarto and Nossa Senhora das Dores, in Sergipe State, and at Cruz das Almas, Bahia State. The plots were composed by 5 m rows spaced at 0.8 m, and within-row spacing of 0.4 m. The recombination of the selected families was made within the same agricultural year, as to get one cycle per year. The maize variety BR 5011 Sertanejo presented a high yield potential and a wide genetic variability. The highly significant family x site interaction highlighted the importance of evaluating productivity across multiple sites, in order to improve the efficiency of selection process and get more reliable estimates of variance components.
The objective of this work was to estimate the genetic parameters of the maize variety BR 5011 Sertanejo, in order to evaluate the behavior of the genetic variability along successive selection cycles. Seventeen between- and within-half-sib family selection cycles and three stratified mass selections were carried out for this maize variety, between 1985 and 2005. In the three first selection cycles of between- and within-half-sib families, families were evaluated using a 10x10 lattice, whereas for the reminder of the cycles, a 14x14 lattice was employed. The assays were carried out in the municipalities of Gararu, Propriá, Poço Verde, Neópolis, Lagarto and Nossa Senhora das Dores, in Sergipe State, and at Cruz das Almas, Bahia State. The plots were composed by 5 m rows spaced at 0.8 m, and within-row spacing of 0.4 m. The recombination of the selected families was made within the same agricultural year, as to get one cycle per year. The maize variety BR 5011 Sertanejo presented a high yield potential and a wide genetic variability. The highly significant family x site interaction highlighted the importance of evaluating productivity across multiple sites, in order to improve the efficiency of selection process and get more reliable estimates of variance components.
| Reference Key |
carvalho2007pesquisaciclos
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|---|---|
| Authors | ;Hélio Wilson Lemos de Carvalho;Evanildes Menezes de Souza |
| Journal | proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006 |
| Year | 2007 |
| DOI |
10.1590/S0100-204X2007000600006
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