Abstract
Transgenic crops producing insecticidal proteins from Bacillus thuringiensis (Bt) provide economic, environmental and health benefits by maintaining or increasing crop yields with fewer applications of insecticide. To sustain these benefits, it is important to delay the evolution of insect resistance to the proteins, and to ensure that the proteins do not harm non-target organisms, particularly those that may control secondary pests that would otherwise flourish because of reduced insecticide applications. Vip3A is a Bt vegetative insecticidal protein that is active against lepidopterous pests. It has a different mode of action from other proteins for control of Lepidoptera in current Bt crops, and when combined with these proteins, it should help to delay the evolution of pest resistance to Bt crops. This paper presents data on the effects of Vip3A on non-target organisms, and an ecological risk assessment of MIR162 maize, which expresses Vip3Aa20. Laboratory studies indicate few adverse effects of Vip3A to non-target organisms: 11 of 12 species tested showed no adverse effects when exposed to high concentrations of Vip3A relative to estimated exposures resulting from cultivation of MIR162 maize. Daphnia magna exposed to Vip3Aa20 were unaffected in terms of survival or fecundity, but grew slightly more slowly than unexposed controls. The data indicate that cultivation of MIR162 maize poses negligible risk to non-target organisms, and that crops producing Vip3A are unlikely to adversely affect biological control organisms such that benefits from reduced insecticide applications are lost.
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Notes
Event Pacha maize was not commercialised and was superseded by MIR162 maize.
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Acknowledgments
We thank the many scientists who directed studies summarised in this paper: Gerson Graser, Cheryl Stacy, Kim Hill, Catherine Kramer, Laura Privalle, David Stacey, Robin Blake and Emma Barnes at Syngenta; Mark Cafarella, Arthur Putt and Deb Teixeira at Springborn Smithers Laboratories; and Stephen Vinall at Mambo-Tox Ltd.
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Raybould, A., Vlachos, D. Non-target organism effects tests on Vip3A and their application to the ecological risk assessment for cultivation of MIR162 maize. Transgenic Res 20, 599–611 (2011). https://doi.org/10.1007/s11248-010-9442-1
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DOI: https://doi.org/10.1007/s11248-010-9442-1