Combinatorial analysis of agronomic characters in soybean

Abstract

Evaluation of the genetic potential of parent plants is fundamental for obtaining superior populations with desirable agronomic characters. The aim of this work was to obtain estimates of the general and specific combining abilities of five soybean parents to identify the most promising parents and hybrid combinations for the development of superior genotypes for grain yield. In this study, two groups of soybean cultivars were selected: group I resistance (UFUS 7910 and BR/MG 46 Conquista) and group II (TMG 4182, TMG 4185 and BRSGO Chapadões). The parents were crossedin a 2 x 3 partial diallel scheme, and the experiment was analyzed according to Griffing’s (1956) parent and F1 model and adapted by Geraldi and Miranda Filho (1988). Six hybrid combinations and respective parents were arranged in randomized complete blocks with four repetitions. The following characters were evaluated: number of days for flowering and maturity, height of the plant in flowering and at maturity, number of nodes in flowering and at maturity, number of total pods and grain yield per plant. The BR/MG 46 Conquista, UFUS 7910 and BRSGO Chapadões parents contributed to obtaining productive segregant populations due to additivity for the total number of pods and grain yield per plant. The hybrid combinations BRSGO Chapadões x BR/MG 46 Conquista, BRSGO Chapadões x UFUS 7910 and TMG4182 x BR/MG 46 Conquista are promising for obtaining populations with high productive potential.

Combining performance and estimated genetic diversity among soybean parents and F1 populations

“…The additive gene effects were predominant for all the characteristics assessed, with the lowest GCA/SCA ratio found for grain yield (1.3) and the highest GCA/SCA ratio for plant height at flowering (18.4). Rocha et al (2019) demonstrated the importance of additive gene effects in controlling the characteristic grain yield when evaluating Furthermore, the complexity of inheritance of quantitative traits and the effect of the genotype x environment interaction may explain the divergence of the results obtained (Goksoy et al, 2019).…”

“…After the selection of parents, hybridizations are carried out to obtain segregating populations with maximum genet-ic variability and a high potential for extraction of superior lines during the selection process. In this context, the prior assessment of the genetic potential of the parents allows for the expansion of genetic variability and, consequently, greater genetic gains can be achieved (Rocha et al, 2019).…”

Combining ability of recombined F4 papaya lines: a strategy to select hybrid combination

“…Positive and negative SCA values were observed for all traits evaluated, indicating the existence of dominance deviations, which leads to genes that increase expression of the traits and others that are equally dominant and reduce this expression. Such estimates allow the selection of genotypes with superior related yield traits (Rocha et al, 2019).…”