Heritability of agronomic traits correlated with reduced stink bug damage in an F_2:3 soybean population derived from IAC-100

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 F_2:3 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. Genotypes showed significant differences for all traits except lodging. The grain-filling period exhibited a positive genotypic correlation of 0.66 with hundred-seed weight, whereas a negative genotypic correlation of −0.53 was found between pod damage index (%) 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.

KEYWORDS:

• Glycine max
• IAC-100
• insect resistance
• Piezodorus guildinii

Acknowledgments

We thank the São Paulo Research Foundation (FAPESP), an independent public foundation with the mission to foster research and the scientific and technological development of the State of São Paulo, and the Brazilian National Council for Scientific and Technological Development (CNPq), which is dedicated to the promotion of scientific and technological research and to the formation of human resources for research in the country.

Declaration of interest

No potential conflict of interest was reported by the author.