Adaptabilidade e estabilidade de linhagens homozigotas de soja no sudoeste do Paraná

Abstract

With the growing global demand for soybeans in recent years, it is of paramount importance to increase productivity per unit area, with genetic improvement being one of the main factors responsible for this feat. The objective of this work was to evaluate the adaptability and stability of homozygous soybean lines in southwest Paraná. The experiment was carried out at the Experimental Station of the Federal Technological University of Paraná, Campus Dois Vizinhos. The trials to evaluate the internal performance of homozygous lines, F6 and F7 generations, were conducted in the 2021/22 and 2022/23 harvests, respectively, with sowings taking place on 10/09/2021 and 26/10/2022. The analyzed response variable was grain yield, with three repetitions of 3 rows and 2 meters in length. The experimental design was randomized blocks. Data were submitted to Analysis of Variance and compared in a bifactorial scheme (crops – 2021/22 and 2022/23 x genotypes – 5 lines and 3 cultivars). The adaptability and stability analysis were performed using the Wricke and Annicchiarico methods. The statistical programs used for analysis were RBio and Genes. Homozygous strains, for the most part, had lower productive performance than commercial cultivars in the season with prolonged water deficit. Part of the homozygous strains had a higher productive performance than the cultivars in the crop considered favorable to the soybean crop, with emphasis on Lineage 1. Lineage 3 had the lowest performance in relation to the other genotypes, in both seasons, and will probably be discontinued from the process of generation advancement.