Intended Effect: Insect Resistance
Alpha-Amylase Inhibitor
Peas
Peas engineered to be weevil-resistant elicited immune reactions in mice.
Bacillus thuringiensis (Bt)
Aspen
Innate Immunity is Affected in Insect-Resistant GM Aspens.
Cotton
Cotton plants and seeds expressing Bt toxin were found in non-Bt refuges.
Insect-resistant, transgenic cotton was more susceptible to fungal disease than its parent line.
Adoption of GM Cotton Slowing in West Africa Due to Concerns About Inferior Qualities of Crop
Corn (Maize)
Bt maize has higher lignin content.
Monarch butterfly larvae exposed to anthers from Bt maize ate less and gained less weight.
Byproducts from Bt maize enter streams, and in feeding experiments affected stream insects.
The transgenic sequences of some Bt maize plants have changed since they were approved.
Western Corn Rootworm Not Killed by Bt Corn in Iowa.
Potato
Insect-resistant transgenic potatoes had less foliage and altered levels of leaf-glycoalkaloids.
Rice
Bt rice showed signs of dwarfism and other abnormalities.
Yield differences between insect-resistant Bt rice and non-GM rice.
Root nodule bacteria
Sunflower
Wild sunflowers with transgene for Bt toxin produced more seeds than normal wild sunflowers.
Bt resistance in general
Increasing resistance of pests to genetically modified, insect-resistant Bt crops.
Field performance of Bt Transgenic crops: A review.
Lectin
Sugarcane
Lectin transgene for stemborer resistance alters growth of sugarcane.
Pheromones
Wheat
Pheromone-producing GM wheat does not repel pests in field trials.
RNAi interference
Potential unintended effects of RNAi-based insecticidal crops.