QTL mapping for resistance against the European corn borer (Ostrinia nubilalis H.) in early maturing European dent germplasm

Quantitative trait loci for resistance to spotted and African maize stem borers (Chilo partellus and Busseola fusca) in a tropical maize (Zea mays L.) population

“…This study was in agreement with other QTL mapping studies in maize that reported low phenotypic variances on both the European corn borer, and storage insect pests (Jampatong et al, 2002;Garcia-Lara et al, 2009;Samayoa et al, 2015b;Jiménez-Galindo et al, 2017). Small phenotypic variation values may suggest that the QTL have only small effects, or have larger effects but were only more loosely linked to the marker locus Bohn et al, 2000). The detected QTL in this study were conditioned by over dominance, partial dominance and additive gene actions.…”

“…Partial dominance was found on three (3) QTLs for number of exit holes and stem tunnelling whilst additive gene action accounted for 1 QTL for the number of exit holes. In maize, resistance to the European corn borer is conditioned in a similar manner, albeit with additive gene action accounting for the majority of the QTL than dominance and over dominance gene actions (Guthrie and Russell, 1989;Bohn et al, 2000;Krakowsky et al, 2004;Jampatong et al, 2002). Scott et al (1966) showed that resistance to the European corn borer, a lepidopteran pest just like C. partellus and B. fusca was conditioned by a relatively large number of genes with small effects on chromosomes 1, 2, 4, 6 and 8.…”

“…Melchinger et al (1998) also reported that with a large number of minor QTLs influencing a quantitative trait such as insect resistance, the power of QTL detection and number of common QTLs should be smaller than for a trait governed by a small number of major QTL. The low heritability for stem borer resistance which was indicative of their polygenic nature should not be considered an impediment to maize improvement breeding activities in the tropics or elsewhere Bohn et al, 2000;Garcia-Lara et al, 2009). …”

“…Such markers especially when tightly linked to resistance loci can support the introgression and selection of associated traits in early generations of breeding, thus minimizing the need for extensive and expensive phenotypic analysis (Drinic et al, 2004). Quantitative trait loci (QTL) for insect resistance in some temperate and tropical maize germplasm against various maize stem-borer species have been detected and documented (Bohn et al, 2000;Samayoa et al, 2015b;Jiménez-Galindo et al, 2017). Such results lead to the conclusion that QTL too can be found for resistance to tropical stem borers including C. partellus and B. fusca and could underpin MAB in the future.…”

Fine Mapping and Haplotype Structure Analysis of a Major Flowering Time Quantitative Trait Locus on Maize Chromosome 10

“…Among these QTL, a region of chromosome 10 appears of major importance and has been detected in multiple genetic backgrounds (Lubberstedt et al 1997;Rebai et al 1997;Bohn et al 2000;Moutiq et al 2002;Blanc et al 2006;Wang et al 2008) including a cross between maize and its wild ancestor teosinte (Briggs et al 2007). Recently, K. Chenu, A. Bouchez and C. Giauffret (unpublished results; technical report available upon request from the corresponding author or C. Giauffret) conducted a QTL detection in a population developed from a cross between the dayneutral European Flint inbred line FV286 and the shortday highland tropical line FV331.…”