Research Article

Inheritance of Precocity and of Agronomic Characters in Soybean

Abstract

 Precocious soybean cultivars enable crop rotation and
low pressure to the biotic and abiotic factors. This study aimed to
determinate the inheritance of characters related to precocity and
agronomic characters in soybean segregating population, coming from
contrasting genitors to cycle. The experiment was conducted at a
greenhouse located at Capim Branco farm, belonging to Federal
University of Uberlândia. The MG/BR 46 Conquista and UFUS 6901
cultivars were used to bi-parental crossing and acquirement of F1 and
F2 populations. The individuals of the genitors, F1 and F2 populations
were evaluated to eight characters and the phenotypic, genetic and
environmental variances, broad-sense heritability, average degree of
dominance and gene number were determined. The average for number
of days for flowering and number of days to maturity in the F1
generation was 40.26 and 103.52 days and in the F2 generation was
37.85 and 105.88 days, respectively, which fits into the classification of
semi-precocious. The heritability varied from 2.36% for number of
grains per pod – controlled by 160 genes, to 85.39% for number of days
for maturing – controlled by two genes. On the F2 population, the
existence of transgressed segregates was found, except for number of
days to maturity, number of nodes and intersection height of the first
pod. It was concluded that the genetic variance and heritability of the acquirement of
selection of superior individuals in terms of precocity, height, number of
nodes and compounds of productivity, being promising genotypes in the
soybean breeding program.
 
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