POTENCIAL DO COMPOSTO CDT-1 DE MILHO PARA SELEÇÃO RECORRENTE

Abstract

Recurrent selection using half-sib progenies is a widely used method in the improvement of maize populations. For the efficacy of this method, it is necessary that the populations have genetic variability or superior genotypes for agronomic traits of interest. At each cycle, the estimation of genetic parameters is carried out in order to verify the magnitude and maintenance of the present variability, the possible gains with the selection and the permanence and potential of the population in the recurrent selection program. The objective of this work was to evaluate the potential for improvement of a CDT-1 maize compound for recombination stage in the first cycle under intrapopulation recurrent selection. A total of 140 half-sibling progenies and four commercial controls were evaluated at two sowing dates (September 18 and October 27, 2021), in a randomized block design with three replications. The experiment was carried out in the experimental area of the Cedeteg campus of the State University of the Midwest (UNICENTRO), Guarapuava-PR. The evaluated traits were male flowering (FM), plant height (AP), ear height (AE), relative ear position (PRE), thousand grain weight (PM), grain yield (PG). The progenies showed significant differences for the traits, indicating the presence of genetic variability. The CDT-1 compound has breeding potential to be explored in a recurrent intra-population selection program. The selection gain (GS%=7.42) and the results obtained for heritability (h²=47.61) for the grain yield trait point to the possibility of selection of genotypes with high yield. The selection index of Mulamba & Mock was efficient in the selection of the progenies to be recombined in the next stage of the first selection cycle.