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Evidence of inheritance of resistance to the mexican bean beetle in soybeans


, : Evidence of inheritance of resistance to the mexican bean beetle in soybeans. Crop Science 16(6): 835-837

The inheritance of resistance to the Mexican bean beetle [MBB], (Epilachna varivestis Mulsant), in soybeans, (Glycine max L. Merr.), was evaluated using F3 popualtions. Four populations were obtained by crossing resistant plant introductions to susceptible commercial cultivars. Ratings of percent foliar damage were made on F3 progeny rows containing 25 plants. Progeny rows were replicated 2-4 times depending on seed availability. Parental lines were also grown for comparison. Population means were recorded and estimates of genotypic, environmental and phenotypic variances computed. Broad sense heritability estimates were calculated for each population. Significant genetic variance occurred in all populations. A quantitative inheritance of resistance in soybeans was suggested. Percent foliar damage approximated a normal distribution in the F3 populations exposed to a moderate to heavy MBB infestation. Population means of the F3 progeny were not significantly different from their mid-parent values, alluding to a primarily additive gene action. Several F3 progeny rows with levels of resistance equal to the mean of the resistant parent were observed. Involvement of only 2-3 major genes is suggested, although the exact number of genes controlling resistance was not determined. Broad sense heritabilities were from 44-81% under the conditions of this investigation.

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