Abstract
When it comes to recommending sorghum (Sorghum bicolor) cultivars, it is essential to carry out a genetic evaluation of the agronomic traits of promising genotypes from several common environments where the crop is cultivated. This study consisted of a genetic evaluation of 52 experimental grain sorghum hybrids and eight commercial cultivars. Hybrids were evaluated in 19 experiments representing the most varied cultivation conditions in Brazil. Traits of agronomic interest such as grain yield, flowering and plant height were analysed. Genotypic evaluation was performed following the REML/BLUP (Restricted Maximum Likelihood/Best Linear Unbiased Predictor) procedure; the MHPRVG (Harmonic Mean of Relative Performance of Genotypic Values) method was also employed to study stability and adaptability. Hybrids which stood out in terms of highest grain yield based on genotypic values, stability and adaptability were 0306037, 1G150, DKB 599, 0306039, 1G282 and 0307671. Of these, only 1G282 showed restrictions as to plant height. For flowering, experimental hybrids showed shorter cycles than commercial cultivars, confirming the efficiency of genetic improvement for this trait. With the analysis of grain yield considering days to flowering and plant height as covariates, it was observed that most of the hybrids of greater performance, showed grain yield to be positively influenced by plant height and days to flowering.
Highlights
It is advisable that national competition assays between grain cultivars of sorghum (Sorghum bicolor) are carried out under the most diverse cultivation conditions to make it possible to select cultivars with genetic merit that are free of environmental effects, taking into account the interaction between genotypes and environments through their stability and adaptability, as well as capitalizing on adaptations specific to certain locations.To select the best genotypes, the Brazilian Ministry of Agriculture, Livestock and Supply (MAPA) recommends the use of trials of value for cultivation and use (VCU)
When it comes to recommending sorghum (Sorghum bicolor) cultivars, it is essential to carry out a genetic evaluation of the agronomic traits of promising genotypes from several common environments where the crop is cultivated
We evaluated the genetic value of grain sorghum hybrids focusing on the following traits: grain yield, flowering and plant height and compared their stability and adaptability in different cultivation environments
Summary
It is advisable that national competition assays between grain cultivars of sorghum (Sorghum bicolor) are carried out under the most diverse cultivation conditions to make it possible to select cultivars with genetic merit that are free of environmental effects, taking into account the interaction between genotypes and environments through their stability and adaptability, as well as capitalizing on adaptations specific to certain locations.To select the best genotypes, the Brazilian Ministry of Agriculture, Livestock and Supply (MAPA) recommends the use of trials of value for cultivation and use (VCU). We evaluated the genetic value of grain sorghum hybrids focusing on the following traits: grain yield, flowering and plant height and compared their stability and adaptability in different cultivation environments.
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