GM Crops with One or More Bt Toxins Do Not Pose Risk for Non-Target OrganismsJanuary 22, 2020
Bt crops produce proteins that are toxic to certain insect pests. Increasingly, Bt crop varieties are engineered to produce a number of Bt toxins simultaneously to control target pests more efficiently, expand the range of target pests, and slow down the development of resistance. It has been a concern that Bt crops could pose an increased risk for non-target organisms, since the individual proteins produced might interact with one another.
Jörg Romeis and Michael Meissle conducted a systematic literature search of all major databases in order to spot evidence of interactions between Bt toxins that might cause unexpected damage to non-target organisms. They checked approximately 2,300 literature references for relevant results and identified 58 scientific publications with results from laboratory or field trials. The laboratory studies were conducted with a total of 35 insect species from 24 families and 11 orders. Field trials recording the frequencies of insects chiefly in Bt maize and Bt cotton were carried out in 5 and 7 countries, respectively.
The researchers did not find evidence in the literature that Bt toxins in combination have a different action spectrum than the individual proteins. They concluded that genetically engineered plants containing combined Bt toxins are as safe for non-target organisms as plants with a single Bt toxin.
For more details, read the news article in Agroscope.
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