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a Crop Science Dep., Williams Hall, Box 7620 North Carolina State Univ., Raleigh, NC 27695-7620
b Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
c Curtis Hall, Univ. of Missouri, Columbia, MO 65211
* Corresponding author (andrea_cardinal{at}ncsu.edu)
The European corn borer (ECB), Ostrinia nubilalis (Hübner), is an important pest of temperate maize (Zea mays L.). Damage to the stalk could be minimized by breeding for resistant genotypes but selection is hindered by a laborious phenotypic assay. Knowledge of the position of quantitative trait loci (QTL) conferring resistance to ECB tunneling could greatly simplify selection for this trait. This study was conducted to map QTL for resistance to ECB tunneling, plant height, and anthesis. Recombinant inbred lines of the maize single-cross population B73xB52, were grown at two locations in Iowa in 1997 and 1998. Genotypic and phenotypic data were obtained from each line to perform the QTL analysis. Nine QTL were detected for ECB tunneling, and they were associated with 59% of the genetic variation. Genetic effects for decreased tunneling were derived from the resistant parent, B52, at six QTL. One digenic interaction was detected between QTL for ECB tunneling. Eight and 10 QTL were detected for anthesis and plant height, respectively. ECB tunneling was not significantly correlated with either trait. Several QTL for ECB tunneling reported herein, QTL for ECB tunneling in other maize populations, and QTL for resistance to leaf damage by insect pests of tropical maize are located at similar positions of the maize genetic map.
Abbreviations: AIC, Akaike's information criterion • CIM, composite interval mapping • cM, centimorgan • ECB, European corn borer • LG, linkage group • QTL, quantitative trait loci • RFLP, restriction fragment length polymorphism • RIL, recombinant inbred lines • SCB, sugarcane corn borer • SSR, simple sequence repeats • SWCB, Southwestern corn borer
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