Analysis of combining ability in soybean cultivars

Abstract

Eight soybean cultivars (Doko, Bossier, Ocepar-4, BR-15, FT-Cometa, Savana, Paraná and Cristalina) werecrossed in a diallel design. Plants of the F1 generation and their parents were evaluated under short-day conditions for thedetermination of the general (GCA) and specific (SCA) combining ability. The estimated GCA and SCA values were significantfor the evaluated traits except for the “total cycle”. Highest GCA effects for the traits “days to flowering”, “plant height”,“insertion height”, “number of branches” and “total cycle” were estimated for the cultivars Doko, Cristalina and Savana.The variability observed in the trait “days to flowering” can, for the most part, be explained by additive effects.

Keywords

• Glycine max
• flowering
• heterosis
• diallel