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Genetic analysis of soybean resistance to stinkbug

Rogério Fernandes de Souza ^I; José Francisco Ferraz de Toledo^II

^IUniversidade Estadual de Londrina, Caixa Postal 6001, 86051-970 Londrina, PR, Brasil
^IIEMBRAPA-CNPSo, Caixa Postal 231, 86001-970 Londrina, PR, Brasil. Send correspondence to J.F.F.T.

ABSTRACT

Genetic mechanisms controlling the characters yield, healthy seed weight (HSW), percentage of healthy seeds (PHS) and leaf retention (LR) were studied in crosses involving the commercial cultivars Davis, BR-13 and Lancer and the breeding lines IAC 74-2832 and IAC 78-2318, that are reported to carry insect resistance genes. These materials and their segregating F₂ and F₄ generations were evaluated in the field, under insect (Nezara viridula, Piezodorus guildinii and Euchistus heros - Pentatomidae) pressure. Line IAC 74-2832 was the most resistant. The genetic models fitted to the means of the generations indicated the presence of additive, dominance and epistatic effects. The variance analyses indicated a predominance of additive effects, but also revealed the presence of linkage and genotype x microenvironmental interaction. The breeding potential analyses indicated that it is possible to obtain high yielding resistant lines from Lancer x IAC 74-2832 and Davis x IAC 74-2832 crosses.

Keywords: soybean; stinkbug.

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