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1 August 2001 Rapid Degradation of Cry1F Delta-Endotoxin in Soil
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Abstract

Dow AgroSciences has modified cotton plants (Gossypium hirsutum L.) by inserting a gene from Bacillus thuringiensis Berliner subsp. aizawai that produces an insect-active, full-length Cry1F delta-endotoxin, and is planning to commercialize insect-resistant cotton lines expressing this protein. These cotton lines control tobacco budworm, Heliothis virescens (F.), along with other lepidopteran larvae. A laboratory study was conducted to better understand the degradation of Cry1F protein in a representative soil from the midsouth cotton-growing area of the United States. Bioassay results with tobacco budworm were used to measure the relative titer of the protein in the soil after a series of incubation periods. Based on the decrease in toxicity over time, the half-life of the microbial Cry1F delta-endotoxin was estimated to be less than 1 d under laboratory conditions, indicating a rapid decay rate in soil.

Rod A. Herman, Steven L. Evans, Diane M. Shanahan, Charles A. Mihaliak, Gary A. Bormett, Debra L. Young, and Jeffrey Buehrer "Rapid Degradation of Cry1F Delta-Endotoxin in Soil," Environmental Entomology 30(4), 642-644, (1 August 2001). https://doi.org/10.1603/0046-225X-30.4.642
Received: 29 August 2000; Accepted: 1 May 2001; Published: 1 August 2001
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