Bt Toxin is released in root exudates from 12 transgenic corn hybrids representing three transformation events
Authors: Saxena, D., Flores, S., Stotzky, G.
Journal, Volume, Year: Soil Biology and Biochemistry, volume 34:133-137, 2002
Cry 1Ab Bt protein from 3 different transformation events was detected in root exudates and rhizosphere of seedlings grown for 40 days in the lab and also grown in the field. Protein detection was achieved using Quickstix ELISA and bioassay (mortality was between 38 and 100%).
Used agronomic soil and transgenic plants. Not quantitative, only shows presence. Didn't differentiate between root cell sloughing/decomposition and "leaching" from the plant. States that toxin "accumulates," but this is inappropriate. There is only one time point for detection and it is not a quantitative study so calling it accumulation is inaccurate. Mentions finding Bt activity on soil 180 days after collection. This is much different than other studies.