Insecticidal Activity of the Toxins from Bacillus thuringiensis subspecies kurstaki and tenebrionis Adsorbed and Bound on Pure and Soil Clays.

Applied and Environmental Microbiology
H Tapp, G Stotzky

Abstract

The release of transgenic plants and microorganisms expressing truncated genes from various subspecies of Bacillus thuringiensis that encode active insecticidal toxins rather than inactive protoxins could result in the accumulation of these active proteins in soil, especially when bound on clays and other soil particles. Toxins from B. thuringiensis subsp. kurstaki and B. thuringiensis subsp. tenebrionis, either free or adsorbed at equilibrium or bound on pure clay minerals (montmorillonite or kaolinite) or on the clay size fraction of soil, were toxic to larvae of the tobacco hornworm (Manduca sexta) and the Colorado potato beetle (Leptinotarsa decemlineata), respectively. The 50% lethal concentrations (LC(inf50)) of free toxins from B. thuringiensis subsp. kurstaki were higher than those of both bound and adsorbed complexes of these toxins with clays, indicating that adsorption and binding of these toxins on clays increase their toxicity in diet bioassays. The LC(inf50) of the toxin from B. thuringiensis subsp. tenebrionis that was either free or adsorbed on montmorillonite were comparable, whereas the toxin bound on this clay had higher LC(inf50) and the toxin bound on kaolinite had lower LC(inf50) than when adsorbed on this...Continue Reading

References

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Citations

Jan 22, 1998·Canadian Journal of Microbiology·H Tapp, G Stotzky
Dec 11, 1999·Nature·D SaxenaG Stotzky
Jan 18, 2007·Environmental Monitoring and Assessment·Haifeng QianTao Hong
Mar 20, 2008·Environmental Entomology·Guomin ShanRonald McCormick
Mar 6, 2003·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Henri DinelAndré Ambles
Aug 17, 2002·The Plant Journal : for Cell and Molecular Biology·Astrid T Groot, Marcel Dicke
Jun 12, 2013·Environmental Science and Pollution Research International·Uzochukwu C UgochukwuDavid A C Manning
Jun 26, 2020·Frontiers in Bioengineering and Biotechnology·John PopovichShelley E Haydel
Mar 19, 2008·Archives of Environmental Contamination and Toxicology·Thomas BøhnTerje Traavik
Jan 1, 2013·ISRN Biotechnology·Smita Rastogi Verma
Apr 17, 2013·Environmental Science and Pollution Research International·Uzochukwu C UgochukwuClaire I Fialips
Feb 19, 2002·Bioresource Technology·T T AdamsB M Hanel
Nov 3, 2010·Environmental Science & Technology·Michael MadligerRené P Schwarzenbach
Jun 3, 2008·Journal of Agricultural and Food Chemistry·Haiyan WangJianmin Wu
Jun 9, 2005·Journal of Agricultural and Food Chemistry·Bryan W ClarkJoel R Coats

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