Características de producibilidade de sementes em linhagens de milho transgênico e convencional

Abstract

The objective of this study was to verify the existence of alterations in seed producibility characteristics in conventional maize lines and with traits for tolerance to herbicides and insects. The experimental design was randomized blocks, with subdivided plots in four replications. The treatments consisted of different inbred lines, being: A) Line 1 - conventional; B) Line 1T - genetically modified and carrying the genes Bt11, Ga21 and MIR162; C) Line 2 - conventional; D) Line 2T - genetically modified and carrying the genes Bt11, Ga21 and MIR162. Were determined: plant height, ear insertion height, seed yield, real yield seeds, yield sieves, income bags with 60 thousand seeds per hectare. The seeds yield for the lineage 1 produced in Iraí de Minas showed a significant difference between the conventional lineages with the trait, but in Morrinhos the difference was not observed. The actual seed yield of at both production sites was not affected by the presence of the trait. Line 1 was influenced only in one environment, for lineage 2 there was a significant difference in both areas, with the highest yield in conventional lines. For the evaluated attribute of bags of 60 thousand seeds, significant differences were observed for the two lines under study. The lines that have the trait, presented the lowest values for bags of 60 thousand seeds in the production environment of Iraí de Minas. For seed with flat sieve, there was a significant difference only for the lineage 1 when produced in Iraí de Minas, with the highest values verified in seeds of lines with "trait" compared to seeds of conventional plants. The results for round sieve seeds showed significant difference only for line 1 produced in Iraí de Minas. The evaluation of the characteristics of seed producibility in conventional corn lines with traits for herbicide and insect tolerance in two production sites allowed to verify that the seed production in the environment of Iraí de Minas, made possible to identify the lines that presented the highest yield and real yield.