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CROP BREEDING & GENETICS

Genotypic Correlation and Multivariate QTL Analyses for Cell Wall Components and Resistance to Stalk Tunneling by the European Corn Borer in Maize

^a Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
^b USDA-ARS, Plant Science Research Unit, Dep. of Crop Science, North Carolina State Univ., Raleigh, NC 27695. M.D. Krakowsky, current address: USDA-ARS, Crops Genetic and Breeding Research Unit, Coastal Plain Experiment Station, Tifton, GA 31794. Research conducted in partial fulfillment of the Ph.D. degree by M.D. Krakowsky. This journal paper of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa, Project No. 3134, was supported by Hatch Act and State of Iowa funds and the R.F. Baker Center for Plant Breeding

^* Corresponding author (mkrakowsky{at}tifton.usda.gov).

Correlations between concentrations of cell wall components (CWCs) in the leaf sheath and stalk and resistance to stalk tunneling by the European corn borer (ECB) [Ostrinia nubilalis (Hübner)] have been reported in some maize (Zea mays L.) populations. Evaluations of resistance to ECB stalk tunneling (ECB-ST) and concentrations of neutral detergent fiber (NDF), acid detergent fiber (ADF), and acid detergent lignin (ADL) have been performed on recombinant inbred lines (RILs) developed from the cross of maize inbred lines B73 (susceptible to ECB-ST, low to moderate CWC concentrations) and DE811 (resistant to ECB-ST, high CWC concentrations). The objective of this study was to estimate genotypic correlations between ECB-ST and CWC concentrations and compare locations and effects of quantitative trait loci (QTL) for those traits. Genotypic correlations between ECB-ST and CWCs were not significant, but clustering of QTL for ECB-ST and CWCs was observed. Negative genotypic correlations between ECB-ST and CWC concentrations were observed at some loci, and resistance to ECB-ST may be associated with a subset of the QTL observed for CWCs and ADF in particular. Resistance to ECB-ST may also be associated with starch concentration in the stalk, which could explain the detection of resistance alleles contributed by B73. Examination of temporal differences in CWC and starch concentrations, and marker-assisted transfer of select alleles, could provide more information on mechanisms of resistance to ECB-ST.

Abbreviations: ADF, acid detergent fiber • ADL, acid detergent lignin • CWCs, cell wall components • ECB, European corn borer • ECB-ST, ECB stalk tunneling • IVDMD, in vitro dry matter digestibility • NDF, neutral detergent fiber • QTL, quantitative trait loci • RILs, recombinant inbred lines • WFISIHI, Wisconsin fiber silica high • WFISILO, Wisconsin fiber silica low.