Inheritance of Antibiosis to Sesamia nonagrioides (Lepidoptera: Noctuidae) in Maize
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The stem borer Sesamia nonagrioides (Lefebwe) is the main pest of maize, Zea mays L., in northwestern Spain. The inheritance of the stalk resistance to this maize borer is unknow. The objective of this work was to study the inheritance of antibiosis to Sesamia in maize stalks. Three maize inbreds with different stalk resistance levels to S. nonagrioides were used and 2 crosses were made: CM109 x EP31 (resistant x medium resistant) and CM109 X EP42 (resistant x susceptible). For each cross, 6 generations, consisting of the P 1 , P 2 , F 1 , F 2 , and backcrosses (BC 1 and BC 2 ), were evaluated for 2 yr. Additive, dominance, epistatic, environmental effects, and the genotype x environment interaction were estimated from generation mean analysis. Correlation coefficients among stalk damage traits showed that tunnel length was a good indicator of stalk resistance to Sesamia. The inheritance of stalk resistance to Sesamia is under genetic control. The additive-dominance model without nonallelic and genotype x environment interactions fit the generation mean analysis for both crosses, but gene action differed from one cross to another. For the cross CM109 x EP31, the additive and dominance gene effects were significant and had, in general, similar importance; whereas for CM109 x EP42, stalk resistance involved largely additive effects. A recurrent selection approach should be used to improve resistance to Sesamia combining additive and dominance gene effects or considering only additive effects, depending on the cross evaluated. Resistance was dominant to susceptibility. The resistant inbred CM109 could be used as a donor of stalk resistance.
