Abstract
In breeding of sweet sorghum hybrids, non-additive genetic effects are important in phenotypic expression of the traits of interest. The aim of this study was to evaluate the general combining ability (GCA) of sweet sorghum lines and the specific combining ability (SCA) of the hybrids for agronomic and technological traits. Five fertility restorer lines, four male-sterile lines, and their hybrids from partial diallel crosses were evaluated in experiments laid out in a 5 x 6 triple rectangular lattice design in the municipalities of Lavras, MG and Sete Lagoas, MG, Brazil. Diallel analysis was performed using the Griffing model adapted to partial diallel crosses. There was a significant effect of GCA and SCA for most of the traits evaluated, indicating the participation of additive or dominant genes in inheritance. The restorer lines CMSX508, BRS 511, CMSXS643, and CMSXS646 show potential for use as parents in sorghum breeding programs.
Highlights
Brazil is prominent worldwide for its use of renewable sources for energy production
Biofuel produced in Brazil is largely ethanol, with sugarcane
According to the Shapiro-Wilk and Q-Q plot tests, the assumption of normal distribution of errors was not rejected for all traits
Summary
Brazil is prominent worldwide for its use of renewable sources for energy production. Biofuel produced in Brazil is largely ethanol, with sugarcane The sugarcane crop has some particular features that compromise the feedstock supply for sugarcane mills, such as the renewal rate of crop areas (~20% each year) and the off-season period (Souza et al 2013). About 2 mi ha of sugarcane crop area is under renewal, and the period from March to April is the off-season. This is the context for strategic efforts to diversify bioenergy crops
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