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GENOMICS, MOLECULAR GENETICS & BIOTECHNOLOGY

Fine Mapping of a Major Insect Resistance QTL in Soybean and its Interaction with Minor Resistance QTLs

^a Center for Applied Genetic Technologies and Dep. of Crop & Soil Sciences
^b Dep. of Entomology, Univ. of Georgia, Athens, GA 30602

^* Corresponding author (wparrott{at}uga.edu)

Utilization of native insect resistance genes can be an important component for managing insects in soybean [Glycine max (L.) Merr.]. A major quantitative trait locus (QTL-M) for insect resistance from PI 229358, controlling antibiosis and antixenosis, was previously identified on linkage group (LG) M and was found to increase the effectiveness of a Bacillus thuringiensis (Bt) transgene in soybean. The objectives of this study were to fine-map QTL-M using recombinant substitution lines (RSLs) identified from a ‘Benning’ backcross population, and to evaluate the main effects and the epistatic interactions between QTL-M and other resistance QTLs on LGs G and H using near-isogenic lines (NILs) in a Benning genetic background. The effect of QTL-M was still detectable in the Benning NILs when they were evaluated for resistance to corn earworm [CEW, Helicoverpa zea (Boddie)]. The two minor resistance QTLs only provided insect resistance when QTL-M was also present in the Benning NILs. The QTL-M was fine-mapped to an approximately 0.52-cM region after the first round of phenotyping the RSLs for resistance to CEW and soybean looper [SBL, Pseudoplusia includens (Walker)]. These results should increase the feasibility of cloning QTL-M and help guide the development of insect resistant soybean cultivars.

Abbreviations: Bt, Bacillus thuringiensis • CEW, corn earworm • LG, linkage group • MAS, marker-assisted selection • NIL, near-isogenic line • QTL, quantitative trait locus • RSL, recombinant substitution line • SBL, soybean looper • SSR, simple sequence repeat

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