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Unintended Effects of Genetic Manipulation


Commercialized Product

barley_002: Transgenic barley plants over-expressing a zinc transport protein had smaller seeds and did not accumulate more zinc when grown in zinc-deficient soil.


canola_002: Experimental cross-pollination between transgenic herbicide-resistant canola and wild field mustard led to highly fertile, herbicide-resistant wild field mustard.

canola_003: Transgenes that have escaped from glyphosate-resistant canola can persist in the wild.

canola_004: Conventional, certified canola seedlots were contaminated with genetically engineered seeds.

canola_005: Herbicide-resistant canola volunteers were still detected after ten years of stringent control.

canola_006: Fewer wild bees were observed in glyphosate-resistant canola fields.


cotton_001: Bt cotton showed decreased ability to kill cotton bollworm larvae during flower development and flowering.

cotton_002: Bt cotton had altered protein metabolism and produced less insecticidal toxin in leaves when subjected to high temperatures during boll formation.

cotton_003: Increased resistance to Bt toxin is found in some populations of cotton bollworm (Helicoverpa zea).

cotton_004: Glyphosate-resistant cotton that is sprayed with glyphosate showed abnormal reproductive development.

cotton_005: Fruiting morphology was altered when glyphosate-resistant cotton was sprayed with glyphosate.

cotton_006: Cotton plants and seeds expressing Bt toxin were found in non-Bt refuges.

cotton_007: Insect-resistant, transgenic cotton was more susceptible to fungal disease than its parent line.


maize_001: Bt maize has higher lignin content.

maize_002: Atlantic salmon fed Bt corn had altered enzyme activity in liver and intestine as well as altered proportions and numbers of different white blood cells.

maize_003: Monarch butterfly larvae exposed to anthers from Bt maize ate less and gained less weight.

maize_004: Byproducts from Bt maize enter streams, and in feeding experiments affected stream insects.

maize_005: Bt maize varieties matured more slowly and had on average lower grain yield and higher grain moisture content than conventional varieties.

maize_006: Bt maize had changed lipid composition in stems; also, lipid composition in soil was altered, and soil respiration was reduced.

maize_007: Western corn rootworms were found feeding on volunteer corn plants expressing a Bt toxin specific to that pest.

maize_008: The transgenic sequences of some Bt maize plants have changed since they were approved.


soybean_001: Herbicide-resistant soybean plants were shorter, with less chlorophyll, lower weight, and increased susceptibility to stem-splitting at high temperatures.

soybean_002: Diet containing glyphosate-resistant soybeans affected the nuclei of liver cells in mice.

soybean_003: Glyphosate-resistant soybeans had lower yields.

soybean_004: Root colonization of glyphosate-resistant soybeans by pathogenic Fusarium fungi increased with glyphosate application.

soybean_005: Glyphosate-resistant soybeans have altered root nodules when sprayed with glyphosate.

soybean_006: Transgenic DNA from glyphosate-resistant soybeans was detected in the intestinal flora of humans.


sugarbeet_001: Glyphosate-resistant sugar beet production alters population densities of some arthropods, significantly reducing the number of bees and butterflies in beet fields.

sugarbeet_002: Glyphosate-resistant sugar beets became more susceptible to root rot when sprayed with glyphosate.


herbicide-resistant crops in general: Increased planting of glyphosate-resistant crops and application of glyphosate causes increase in glyphosate-resistant weed species.


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