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a Department of Plant Pathology and Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
b Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
c USDA-ARS, Plant Science Research Unit, Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695-7616
d Department of Crop Sciences, University of Illinois, Urbana-Champaign, IL 61801
e Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695-7567
f USDA-ARS National Center for Agricultural Utilization Research, 1815 N University St., Peoria, IL, 61604
g Pioneer Génétique, Pacé, France
h USDA-ARS, Plant Science Research Unit, Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
* Corresponding author (james_holland{at}ncsu.edu)
Fusarium verticillioides (Sacc.) Nirenberg (synonym F. moniliforme Sheldon) (teleomorph: Gibberella moniliformis) and F. proliferatum (Matsushima) Nirenberg (teleomorph: G. intermedia) are fungal pathogens of maize (Zea mays L.) that cause ear rot and contaminate grain with fumonisins, mycotoxins that can harm animals and humans. The objective of this study was to identify quantitative trait loci (QTL) for resistance to Fusarium ear rot and fumonisin contamination in two maize populations, comprised of 213 BC1F1:2 families from the first backcross of GE440 to FR1064 (GEFR) and 143 recombinant inbred lines from the cross of NC300 to B104 (NCB). QTL mapping was used to study the genetic relationships between resistances to ear rot and fumonisin contamination and to investigate consistency of QTL across populations. In the GEFR population, seven QTL explained 47% of the phenotypic variation for mean ear rot resistance and nine QTL with one epistatic interaction explained 67% of the variation for mean fumonisin concentration. In the NCB population, five QTL explained 31% of the phenotypic variation for mean ear rot resistance and six QTL and three epistatic interactions explained 81% of the phenotypic variation for mean fumonisin concentration. Eight QTL in the GEFR population and five QTL in the NCB population affected both disease traits. At least three ear rot and two fumonisin contamination resistance QTL mapped to similar positions in the two populations. Two QTL, localized to chromosomes four and five, appeared to be consistent for both traits across both populations.
Abbreviations: ELISA, enzyme-linked immunosorbant assay • GEFR, (GE440 x FR1064) x FR1064 • GEI, genotype x environment interaction • NCB, NC300 x B104 • QTL, quantitative trait locus • RIL, Recombinant inbred lines
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