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European Corn Borer Resistance and Cell Wall Composition of Three Maize Populations

Garst Seed Co., Cottage Grove, WI 53527
Dep. of Agronomy, Univ. of Wisconsin, Madison, WI 53706
Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583
Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

^* Corresponding author.

Feeding activities of herbivorous insects are influenced by host plant nutritional quality. Improved insect resistance resulting from either natural or artificial selection may be due, in part, to changes in nutritive constituents of plants. The first objective of this study was to measure changes in detergent fiber, lignin, ash, and N concentrations in whorls, leaf-sheaths, and stalks of the BS9 maize (Zea mays L.) population across five cycles of selection for resistance to the European corn borer (ECB) [Ostrinia nubilalis (Hübner)]. The second objective was to evaluate ECB resistance in the WFISIHI and WFISILO maize populations, which were developed for high and low concentrations, respectively, of indigestible plant constituents (acid detergent fiber, lignin, and silica) in the leaf sheath. Leafsheath composition for all five cycles of BS9 was measured in three environments in Iowa. Whorl, leaf-sheath and stalk composition, as well as first- and second-generation ECB resistance of populations WFISIHI, WFISILO and Cycles 0, 2, 4, and 5 of BS9 were evaluated in two environments in Wisconsin. Whorl composition was not related to changes in ECB resistance in anypopulation. In BS9, leaf-sheath and stalk concentrations of neutral and acid detergent fiber, cellulose, and lignin increased linearly over selection cycles. In contrast, WFISIHI was as susceptible to second-generation ECB as WFISILO, suggesting that the responses in BS9 may be due to linkage or unintentional selection. Populations BS9, WFISIHI, and WFISILO, however, were derived from diverse sources, and it is likely that mechanisms for resistance differ for the three populations.

Received for publication October 11, 1988.

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