Parâmetros genéticos e avaliação agronômica em progênies F2 de soja no Distrito Federal, Brasil

Abstract

The objective of this paper was to evaluate the genetic and agronomic parameters of soybean F2 progenies in the Federal District, Brazil, from twenty biparental crosses, between parents with absence of lipoxygenases and parents with long juveniles. The experiment was conducted in the Federal District, crop 2013/14. The experimental design was randomized blocks with four replicates. The following were evaluated: agronomic characteristics, estimated heritability, relationship between the genetic and environmental variation coefficient and phenotypic correlations between the characters. Hybridizations between cultivars, with a long juvenile period and cultivars intended for human consumption, caused a great variation in the maturation cycle. The Amaralina x UFVTN105 cross was more likely to be selected for plant height, while the UFVTN105 x M8867 cross showed a higher frequency of recombinants for grain production. Based on heritability and the CVg/CVe quotient, the selection by number of days for maturation (NDM) and plant height at maturity (PHM) is effective in the F2 segregating population. Positive and significant correlations of strong magnitude between the variables NDM x PHM and NPP (number of pods per plant) x GY (Grain yield) and of medium magnitude between PHM x HPI (height first pod insulation), allow indirect selection in obtaining soybean genotypes with high grain yield per plant and with better flavor in early generations.