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首页> 外文期刊>Environmental toxicology and chemistry >A MIXTURE TOXICITY APPROACH FOR ENVIRONMENTAL RISK ASSESSMENT OF MULTIPLE INSECT RESISTANCE GENES
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A MIXTURE TOXICITY APPROACH FOR ENVIRONMENTAL RISK ASSESSMENT OF MULTIPLE INSECT RESISTANCE GENES

机译:多抗性基因的环境风险评估的混合毒性方法

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摘要

Multiple substance considerations applied to chemical mixtures in ecological risk assessments can be logically extended to nontarget organism (NTO) risk assessment for pyramided trait crops expressing multiple insect resistance genes. A case instance is developed that considers a two-protein pyramid of Cry IF and Cry 1 Ac synthetic proteins expressed in cotton (Gossypium hirsutum L.). A mixture toxicity approach was used to arrive at the aggregated multisubstance potentially affected fraction (msPAF) of NTOs that may be at risk from exposure to CrylF + CrylAc cotton in representative-use environments. Development of the msPAF for putative susceptible NTOs considered laboratory toxicity data for Lepidoptera expressed in terms of additive mixture toxicity as well as data on in planta expression of the CrylF and CrylAc proteins and their translation into environmental loads and exposure concentrations. The msPAF based on tier 1 estimated environmental concentrations (EECs) and toxicity to Lepidoptera species-used as surrogate data for adverse effects to a putative susceptible species-provided a highly conservative estimate of effects on beneficial species and therefore is a ready means to conduct screening-level NTO risk assessments for pyramided crops.
机译:在生态风险评估中,应用于化学混合物的多种物质考虑可以从逻辑上扩展到表达多种昆虫抗性基因的金字塔状农作物的非目标生物(NTO)风险评估。开发了一个实例实例,该实例考虑了在棉花(陆地棉)中表达的Cry IF和Cry 1 Ac合成蛋白的两个蛋白金字塔。使用了混合毒性方法得出了在代表性使用环境中可能遭受暴露于CrylF + CrylAc棉花的风险的NTO的多物质潜在影响总分(msPAF)。推定易感NTO的msPAF的开发考虑了鳞翅目的实验室毒性数据,以添加剂混合物的毒性表示,以及CrylF和CrylAc蛋白在植物体内的表达以及将其转化为环境负荷和暴露浓度的数据。基于一级估计环境浓度(EEC)和对鳞翅目物种的毒性的msPAF(用作对假定的易感物种的不利影响的替代数据)提供了对有益物种的影响的高度保守估计,因此是进行筛查的现成手段金字塔作物的高级别NTO风险评估。

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