|Da Fonseca Santos, Michelle - Universidad De Sao Paulo|
|Moller, Milene - Universidad De Sao Paulo|
|Baldin Pinheiro, Jose - Universidad De Sao Paulo|
Submitted to: Journal of Crop Improvement
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/17/2017
Publication Date: 12/13/2017
Citation: Da Fonseca Santos, M., Moller, M., Clough, S.J., Baldin Pinheiro, J. 2017. Heritability of agronomic traits correlated with reduced stink bug damage in an F2:3 soybean population derived from IAC-100. Journal of Crop Improvement. doi.org/10.1080/15427528.2017.1370404.
Interpretive Summary: Stink bugs are a serious pest to soybean in the US and Brazil, as well as other parts of the world. In Brazil, they are the most important insect pest on soybean. We crossed IAC-100, a resistant variety, with a susceptible variety to determine which phenotypic traits are associated with resistance. We found that the small seed size (as indicated by a lower weight of 100 seed) is linked tightly enough with resistance that this variable can be used to select resistance, when IAC-100 is the resistant parent in the study. This is of interest to soybean breeders who could select for stink bug resistance in populations derived from IAC-100 in the absence of the insect.
Technical Abstract: In Brazil, some of the most important insect pests causing damage to soybean (Glycine max) are stink bugs. Soybean production would increase if varieties with enhanced resistance were developed. The aim of this work was to examine different traits associated with plant development, and yield-related traits, in an F2:3 soybean population in a stink bug-infested field, and to evaluate genetic parameters and correlations among those traits. The parents and progeny from 229 F2 plants developed by crossing a resistant cultivar (IAC-100) with a susceptible cultivar (CD-215) were evaluated in three replications in a single environment. Seven agronomic traits and eight indicators of insect resistance were measured. Except for lodging, the traits studied showed significant differences. The grain-filling period exhibited a positive genotypic correlation of 0.66 with hundred-seed weight, while a negative genotypic correlation of -0.53 was found between percent index of pod damage and weight of healthy seeds. In general, a shorter pod-filling period, lower weight of hundred-seeds, lower indices of pod damage and higher seed-yield per plant were phenotypic traits of genotypes resistant to these insects.