Correlações fenotípicas, genotípicas e caracterização agronômica de soja cultivada com infestação natural de percevejos (Euschistus heros)

Abstract

Soybean is one of the most cultivated grain species in Brazil and in the world and contributes to the Brasilian economy. Biotic and abiotic stresses are increasingly frequent in the agricultural scenario and are responsible for increasing the challenges and threating commercial grain production. The crop is exposed to the severe attack of several pests, among them the brown stink bug (Euschistus heros), which compromises the quality of the seeds and causes losses of up to 30% of the productive potential. In this scenario, breeding programs have an important duty in the development of superior strains and tolerant to the main pests in legumes. The objective of the study was to estimate genetic parameters and to select soybean strains grown under natural infestation of stink bugs. The experiment was conducted in the experimental area of Fazenda Capim Branco belonging to the Federal University of Uberlândia in the 2017/2018 harvest. 13 soybean lines and 1 cultivar (UFUS 7910) were evaluated. The randomized complete block design was adopted with three replications. Agronomic characters and grain production were measured. Through the analysis of the results it was observed that for cycle, height, number of nodes and total pods the genotypic determination coefficient was higher than 70%. Grain production proved to be a useful trait in the indirect selection of genotypes with stink bugs tolerance. The G3 and G11 lines were highlighted as superior genotypes, showing promising agronomic performance under conditions of natural stink bug infestation.