Research Article Line selection and correlation between traits of soybean genotypes under high naturally occurring stink bug infestation

Abstract

The soybean crop is undoubtedly important to not only Brazil but also for most parts of the globe, as economic and social dependency upon this crop becomes evident. However, the scenario of the soybean crop production has faced challenges with environmental changes, which have escalated the incidence of pests. Due to the abundance of stink bugs, especially Euschistus heros in tropical regions, they can considerably impact the productivity of the crop compromising total grain yield and seed quality. Therefore, this research was aimed to evaluate soybean lines with desirable agronomic traits under high natural infestation of Euschistus heros and to access the genotypic and phenotypic correlations between important agronomic traits for soybean breeding. Twenty-three soybean F8 lines developed by the Soybean Breeding Program of Federal University of Uberlândia and four cultivars (Msoy 8527, UFUS Xavante, Msoy 8787, and UFUS Milionária) were evaluated under randomized complete block design with three repetitions during the growing season of 2015/2016 and 16 agronomic traits were accessed. There was genetic variability for all traits but Asian soybean rust severity at 1% probability level through F test. For all traits in the study but the total number of pods and Asian soybean rust severity, the ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 18 (1): gmr18182 G.L. Jorge et al. 2 coefficient of genotypic determination was superior to 70%, indicating that the most part of phenotypic variability was due to genetic differences among the genotypes in study. Grain yield was demonstrated to be a useful trait for indirect selection of soybean genotypes with resistance to brown stink bugs. Also, early cycle genotypes, heavy seeds and a higher number of pods revealed a positive correlation with grain yield over the same conditions. The lines G1, G2, and G24 are very promising genotypes as they have shown valuable agronomic traits for stink bug resistance.

Genetic variability and relationship of agronomic characters of soybean lines in tidal swamp land

“…This is different from the study by Xu et al [29] who reported that the number of pods per plant increased when the number of branches increased, while the pod number per unit area decreased. In other studies, it was also reported that there was a phenotypic correlation between plant height and the number of nodes on main stem [30] and HGT and POF [7].…”

Exploring chemical diversity in Glycine max cultivars: A multivariate approach in the search for bioactive compounds against Spodoptera cosmioides

“…Nevertheless, we cannot infer that metabolite variability can be a direct consequence of transgene insertion. We also have UFUS Xavante, a conventional cultivar obtained through genetic improvement in this grouping (Jorge et al, 2019).…”