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Susceptibility of Cry1Ab maize-resistant and -susceptible strains of sugarcane borer (Lepidoptera: Crambidae) to four individual Cry proteins

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Sugarcane borer, Diatraea saccharalis (F.), is a major target of Bt maize in South America and many areas of the US mid-south region. Six laboratory strains of D. saccharalis were established from six single-pair F2 families possessing major resistance alleles to Cry1Ab maize hybrids. Susceptibility of the six strains was evaluated on diet treated with each of four purified trypsin-activated Bt proteins, Cry1Ab, Cry1Aa, Cry1Ac and Cry1F. Bt susceptibility of the six strains was compared with that of known Cry1Ab-susceptible and -resistant strains of D. saccharalis. At least two of the six strains demonstrated a similar level (>526-fold) of resistance to Cry1Ab as shown in the known Cry1Ab-resistant strain, while resistance levels were relatively lower for other strains (116- to 129-fold). All the six strains were highly cross-resistant to Cry1Aa (71- to 292-fold) and Cry1Ac (30- to 248-fold), but only with a low level to Cry1F (
Liping Zhang , Fangneng Huang , B. Rogers Leonard , Mao Chen , Thomas Clark , Yu Cheng Zhu , David S. Wangila , Fei Yang , Ying Niu
Bacillus thuringiensis , Diatraea saccharalis , alleles , artificial diets , bacterial proteins , corn , cross resistance , crystal proteins , hybrids , insecticidal proteins , insecticide resistance , transgenic plants , South America , United States
Journal of Invertebrate Pathology 2013 v.112
Journal Articles, USDA Authors, Peer-Reviewed
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