Análise de adaptabilidade e estabilidade produtiva em híbridos de milho: um enfoque no cerrado brasileiro

Abstract

Globally, corn (Zea mays L.) features a really great collection of technical-scientific knowledge. During breeding, in the selection of superior genotypes, one of the toughest breeders challenges is the evaluation of genotype x environment interaction (G×E). Yield trials from the last breeding stage in years 2015 to 2017 for “safrinha” were analyzed, including 6 genotypes and 6 cities from Mato Grosso and Goiás states in Brazil. The experiments were conducted in a randomized block design with two replications. Since corn has quantitative herdability, stability and adaptability knowledge of genotypes becomes necessary for minimize interaction effects and ease its recommendations. Additive main effects and multiplicative interaction (AMMI) method has this aspect, reflecting a model that is equivalent to fitting a two-way analysis of variance (ANOVA) for the main effects and applying a singular value decomposition to the interaction matrix. Also assumes that all model effects (except error) are fixed. In this way, this paper objective is to identify stable and adaptable genotypes to a wide variety of environments, as well a possible environmental stratification in the tested region, minimizing expenses and maximizing results.