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Genetics of Antibiosis Resistance to Mexican Bean Beetle in Soybean

Dep. of Agronomy, Ohio Agric. Res. and Development Ctr., The Ohio State Univ., Columbus, OH 43210

R. L. Cooper and R. B. Hammond

USDA-ARS, Wooster, OH 44691
Dep. of Entomology, Ohio Agric. Res. and Development Ctr., The Ohio State Univ., Wooster, OH 44691

^* Corresponding author.

A larval antibiosis screening technique was applied to three soybean [Glycine max (L.) Merr.] populations to determine the inheritance of resistance to Mexican bean beetle [Epilachna varivestis (Mulsant)]. The F₁, F₂, and F₃ generations (five F₃ plants per F₂ plant) of crosses between ‘Williams’ (susceptible) and L76-0049, L78-608, and L76-0328 (resistant) were screened along with the parents. Mean weight of surviving larvae after 10 d of feeding on detached leaves was used as the measure of antibiosis. The resistance of F₁ plants was intermediate to that of their parents. Data from the F₁ of Williams x L76-0049 and Williams x L76-0328 indicated a small degree of dominance for resistance. The distributions of F₂ and F₃ phenotypes were continuous and unimodal. Skewness toward susceptibility occurred in Williams x L76-0328, but symmetry was evident in the other crosses. Heritability estimates (single F₂ plant basis) ranged from 0.33 to 0.48 when calculated from F₃ data, and from 0.11 to 0.22 when calculated from the covariance of F₂ plants and their F₃ progeny. Estimates of heritability derived from F₂ and parental data were larger but had large standard errors. Gene number estimates by the method of moments, and frequency of recovery of parental phenotypes suggested that the number of segregating resistance loci was small. Provided selection was no more intense than 2.5%, expected genetic gain from selection among individual F₂ plants was greater if a large number of plants were screened with a single determination per plant than if one-half or one-third that number were screened with two or three determinations per plant, respectively.

Received for publication May 12, 1988.

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