Biology / Bio 1553 · Atom · ~20 seconds
Bt Toxin as an Organic Insecticide
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Bacillus thuringiensis produces a protein crystal toxic to specific insects when ingested; cloning its gene into a plant makes the plant insecticidal.
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A plant carrying the cloned Bt toxin gene stops insects that ingest it from feeding within hours.
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Bt toxin must be ingested and activated in the insect gut — it is not a contact poison, and is nontoxic to mammals.
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