Analysis of Cry1Ab toxin bioaccumulation in a food chain of Bt rice, an herbivore and a predator

文献类型： 外文期刊

第一作者： Ye, Gong-yin

作者： Ye, Gong-yin;Fang, Qi;Hu, Cui;Liu, Zhi-cheng;Peng, Yu-fa

作者机构：

关键词： Bt rice;Non-target effect;Bioaccumulation;Tritrophic interactions;Ecological risk assessment

期刊名称：ECOTOXICOLOGY （ 影响因子：2.823； 五年影响因子：2.958 ）

ISSN： 0963-9292

年卷期： 2009 年 18 卷 2 期

页码：

收录情况： SCI

摘要： Lessons from organophosphorus pesticides, which could be bioaccumulated in non-target organisms at different trophic levels and caused unexpected negative impacts, necessitate a study of the possibility of biotransfer and bioaccumulation of Bacillus thuringiensis (Bt) insecticidal toxin(s) expressed in Bt plants. Using ELISA, we evaluated the transfer of Cry1Ab toxin in a food chain of Bt rice (KMD1 and KMD2), the target insect, Cnaphalocrocis medinalis, and its predator, Pirata subpiraticus. Cry1Ab was detected in C. medinalis and P. subpiraticus. However, the concentration of Cry1Ab detected from C. medinalis and P. subpiraticus did not increase as feeding or preying time increased. A binding study of Cry1Ab to the brush border membrane vesicle of C. medinalis and P. subpiraticus indicated that P. subpiraticus does not have binding receptors in its midgut to Cry1Ab, while C. medinalis does. Survivorship and fecundity of P. subpiraticus preying on Bt rice-fed C. medinalis were not significantly different from those preying on non-Bt rice-fed C. medinalis. Developmental time of P. subpiraticus was significantly longer when it preyed on Bt rice-fed C. medinalis than on non-Bt rice-fed prey. However, a 3-year field trial indicated that Bt rice did not significantly affect the density of P. subpiraticus.

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