Soybean Yield and Seed Germination of Potential Genotypes for Resistance to Stink Bug Complex.

The soybean yield and seed quality can be decreased by stink bugs incidence during the production process of seeds. The selection of genotypes with potential traits for stink bugs resistance can provide parameters that will assist the selection of new soybean lines in breeding programs; therefore the identification of soybean genotypes potentially resistant to stink bugs is a relevant subject of study. This work aimed to compare the yield and seed germination parameters of several soybean genotypes under stink bugs attack. Twenty-four soybean genotypes were evaluated in presence and absence of chemical insect control, at 2012/2013 season. The experiments were conducted in a randomized block design with five replicates, at the Experimental Station of Anhembi (Department of Genetics, USP, ESALQ, Brazil). The following parameters were evaluated: i) seed yield (SY, g plot^-1); ii) healthy seed weight (HSW), g plot^-1), iii) seed germination (%G) and iv) resistance index estimation [% reduction = (HSW SY^-1) 100]. After ANOVA analysis, a significant interaction (p≤0.05) among genotypes and control systems was observed for the most evaluated parameters (except for % reduction). Among the selected genotypes, five could be considered as potential lines for productivity traits and, other four genotypes had great germination percentage in both presence and absence of insects. At least nine lines showed the lowest values for the resistance index estimation (% reduction) in the both control systems, highlighting LQ1050 line.