Dissipation of Insecticidal Cry1Ac Protein and Its Toxicity to Nontarget Aquatic Organisms

文献类型： 外文期刊

第一作者： Du, Juan

作者： Du, Juan;You, Jing;Li, Yan-Liang;Du, Juan;Li, Yan-Liang;Fang, Zhi-Xiang

作者机构：

关键词： dissipation;Bt cotton;Cry1Ac protein;toxicity;aquatic nontarget organisms

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.279； 五年影响因子：5.269 ）

ISSN： 0021-8561

年卷期： 2013 年 61 卷 46 期

页码：

收录情况： SCI

摘要： The widespread cultivation of Bacillus thuringiensis crops has raised public concerns on their risk to nontarget organisms. Persistence of Cry1Ac protein in soil, sediment and water and its toxicity to nontarget aquatic organisms were determined. The dissipation of Cry1Ac toxin was well described using first order kinetics, with the half-lives (DT50) ranging from 0.8 to 3.2, 2.1 to 7.6 and 11.0 to 15.8 d in soil, sediment and water, respectively. Microbial degradation played a key role in the dissipation of Cry1Ac toxin and high temperature accelerated the processes. Cry1Ac toxin was more toxic to the midge Chironomus dilutus than the amphipod Hyalella azteca, with the median lethal concentration (LC50) of C. dilutus being 155 ng/g dry weight and 201 ng/mL in 10-d sediment and 4-d water bioassays, respectively. While Cry1Ac toxin showed toxicity to the midges, risk of Bt proteins to aquatic nontarget organisms was limited because their environmentally relevant concentrations were much lower than the LC(50)s.

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