Generation mean analysis for resistance in maize to the corn leaf aphid (Homoptera: Aphididae)
1991
Bing, J.W. | Guthrie, W.D.
Corn leaf aphids [Rhopalosiphum maidis (Fitch)] can be a serious pest of maize, Zea mays L. Because very, little is known about the genetics of corn leaf aphid resistance in maize, a generation mean analysis was conducted on nine generations of maize [P1, B96 (susceptible); P2, Mo17 (resistant); F1; F2; F3; BC1; BC2; BS1; and BS2] to determine the type of gene action involved. The model that included additive and dominant effects explained 64.8% of the total variation among generations, whereas the model that included additive, dominant, and epistatic effects did not significantly improve the fit. The estimate of the additive genetic effects was most important, indicating that several loci contributed resistance to the corn leaf aphid. Dominant genetic effects were significant, but not as important as additive effects. Residuals remaining after fitting for additive and dominance effects were significant, indicating that more complicated genetic mechanisms may be involved.
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