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Published in Crop Sci 16:835-837 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evidence of Inheritance of Resistance to the Mexican Bean Beetle in Soybeans1

V. A. Sisson, P. A. Miller, W. V. Campbell and J. W. Van Duyn2

The inheritance of resistance to the Mexican bean beetle, (Epilachna varivestis Mulsant), in soybeans, (Glycine max L. Merr.), was evaluated using F3 populations. 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 two to four 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. The results suggest a quantitative inheritance of resistance in soybeans. 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 two or three major genes is suggested from our observations, although the exact number of genes controlling resistance could not be determined. Broad sense heritabilities ranged from 44% to 81% under the conditions of this investigation.

Key Words: Broad sense heritability • Glycine max (L.) Merr. • Epilachna varivestis Mulsant • Host plant resistance

1 Contribution from the Dep. of Crop Sci. and Entomol. Paper No. 4946 of the Journal Series of the North Carolina Agric. Exp. Stn., Raleigh, N. C. The use of trade names in this publication does not imply endorsement by the North Carolina Agric. Exp. Stn. of the products named, nor criticism of similar ones not mentioned. This publication was supported in part by the Nat. Sci. Found. and the Environ. Prot. Agency, through a grant (NSF GB-34718) to the Univ. of California. The findings, opinions and recommendations expressed herein are those of the authors and not necessarily those of the Univ. of California, the Nat. Sci. Found. or the Environ. Prot. Agency. Adopted from a thesis submitted by the senior author for partial fulfillment of the M.S. degree requirements.

2 Research assistant; formerly professor of crop science, N. C. State Univ. (now staff scientist, national program staff USDA-ARS, Beltsville, MD 20705); professor of entomology, N. C. State Univ.; extension assistant professor of entomology, N. C. State Univ., respectively.

Received for publication March 29, 1976.


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