ecoglobe [yinyang] news (1 December 1999)

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Gene-Modified Corn Insectide in Soil - Study

LONDON -- U.S. scientists were cited as reporting in Nature Wednesday they had uncovered what could be either a potential hazard or benefit of genetically modified (GM) corn.

Dr Guenther Stotzky and researchers at New York University have, according to this story, shown that BT corn, the seed variety which is resistant to corn borer pests, releases an insecticide through its roots into the soil. The toxin remains in the soil because it is not easily broken down. It retains its insecticide properties, which could help to control pests or promote insects resistant to the pesticide, the scientists aren't sure which.

Stotzky and his colleagues were cited as writing that, "Further investigations will be necessary to shed light on what might happen underground."

The story says their work is the first to show that the toxin from the genetically-engineered BT corn can seep into the soil. Stotzky said so far there was little evidence that GM technology was potentially harmful but the discovery would add to the confusion about the safety of GM crops.

Stotzky was quoted as saying in an interview that, "There is a potential hazard that it (the toxin) builds up and could enhance the selection of resistant target organisms and could possibly effect non-target organisms. Theoretically it could affect any organism that is susceptible to the toxin."

The BT corn contains the genes that allow it to produce the insecticide. The amount of it in the plant is minimal so the hazard to people eating it is essentially non-existent, he said.

But Stotzky called for more studies to determine the impact of the toxin's build-up in the soil on insects and other organisms.

"Those studies need to be done. They should have been done a long time ago before the regulatory agencies allowed the release of these plants," he added.
(December 1, 1999 Reuters/PA News)

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