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| - Influence of Cry1Ac Toxin on Mineralization and Bioavailabilityof Glyphosate in Soil
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| - The impact of transgenic plants containing Bacillus thuringiensis (Bt) toxin on soil processes hasreceived recent attention. In these studies, we examined the influence of the lepidopterean Bt Cry1Actoxin on mineralization and bioavailability of the herbicide glyphosate in two different soils. The additionof 0.25−1.0 μg g-1 soil of purified Cry1Ac toxin did not significantly affect glyphosate mineralizationand sorption in either a sandy loam or a sandy soil. In contrast, extractable glyphosate decreasedover the 28 day incubation period in both soils. Our findings suggest that the reduction in thebioavailabily of glyphosate was not influenced by the presence of Cry1Ac toxin but rather the resultsof aging or sorption processes. Results from this investigation suggest that the presence of moderateconcentrations of Bt-derived Cry1Ac toxin would have no appreciable impact on processes controllingthe fate of glyphosate in soils. Keywords: Glyphosate; Cry toxins; Cry1Ac; herbicide sorption; herbicide mineralization; geneticallymodified crops
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