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CELL BIOLOGY & MOLECULAR GENETICS

Genetic Components of Resistance to Stalk Tunneling by the European Corn Borer in Maize

Dep. of Agronomy, 100 Osborn Dr., Iowa State Univ., Ames, IA 50011

* Corresponding author (mlee{at}iastate.edu)

Identification of the genes conferring resistance to European corn borer (ECB) [Ostrinia nubilalis (Hübner)] is an important step in understanding how resistance is expressed and whether different sources of maize (Zea mays L.) germplasm can be combined to enhance protection. The locations of genes for resistance to ECB tunneling have been reported but are inconsistent across studies. The objectives of this study were to map and characterize quantitative trait loci (QTL) for resistance to tunneling in De811 and compare these with related studies and with QTL for anthesis and ear height. Inbred De811 (resistant) was crossed to susceptible inbred B73 to produce a population of 147 F₃ lines. The population was artificially infested and evaluated in three environments. The F₃ lines were genotyped at 88 restriction fragment length polymorphism (RFLP) loci to facilitate QTL mapping with composite interval mapping (CIM). Seven QTL for ECB tunneling were detected on chromosomes 1, 3, 4, 5, and 8, associated with 42% of the phenotypic variation. The F₁ exhibits partial dominance for resistance but only one QTL with dominant gene action was observed. An F₃ population of B73 x B52 that was evaluated in the same environments facilitated comparisons of genetic heterogeneity between inbreds De811 and B52. Only one QTL for tunneling was common between the populations, indicating that the two inbreds may contribute different genes for resistance in crosses with B73. This information could be useful for combining the favorable alleles of De811 and B52.

Abbreviations: AIC, Aikake information criteria • CI, confidence interval • CIM, composite interval mapping • cM, centimorgan • ECB, European corn borer • GDD, growing-degree days • LOD, log of the odds ratio • QTL, quantitative trait loci • RFLP, restriction fragment length polymorphism • SCB, sugarcane borer • SWCB, Southwestern corn borer

This article has been cited by other articles:

				M. D. Krakowsky, M. Lee, W. L. Woodman-Clikeman, M. J. Long, and N. Sharopova QTL Mapping of Resistance to Stalk Tunneling by the European Corn Borer in RILs of Maize Population B73 x De811 Crop Sci., January 1, 2004; 44(1): 274 - 282. [Abstract] [Full Text] [PDF]