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Bitrophic and Tritrophic Effects of Transgenic cry1Ab/cry2Aj Maize on the Beneficial, Nontarget Harmonia axyridis (Coleoptera: Coccinellidae)

文献类型： 外文期刊

作者： Chang, Xue 2 ; Lu, Zengbin 3 ; Shen, Zhicheng 1 ; Peng, Yufa 4 ; Ye, Gongyin 1 ;

作者机构： 1.Zhejiang Univ, Inst Insect Sci, State Key Lab Rice Biol & Agr Entomol, Minist Agr, Hangzhou 310058, Zhejiang, Peoples R China

2.Jilin Acad Agr Sci, Inst Plant Protect, Key Lab Integrated Pest Management Crops Northeas, Minist Agr, Gongzhuling 136100, Peoples R China

3.Shandong Acad Agr Sci, Key Lab Biol & Genet Improvement Maize Northern Y, Natl Engn Lab Wheat & Maize, Maize Res Inst,Minist Agr, Jinan 250100, Shandong, Peoples R China

4.Chinese Acad Agr Sci, Inst Plant Protect, State Key Lab Biol Plant Dis & Insect Pests, Beijing 100193, Peoples R China

关键词： transgenic cry1Ab/cry2Aj maize;Harmonia axyridis;nontarget risk assessment;tritrophic interaction;bitrophic interaction

期刊名称：ENVIRONMENTAL ENTOMOLOGY （ 影响因子：2.377； 五年影响因子：2.298 ）

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收录情况： SCI

摘要： Harmonia axyridis (Pallas) is a common and abundant predator in China and may be exposed to Cry toxins that are produced in Bt crops either by feeding on plant parts or by feeding on target or nontarget herbivorous insects. A new Bt maize line, expressing the Cry1Ab/Cry2Aj fused protein, has been developed and should be rigorously assessed for the ecological risks on the natural enemy. Laboratory experiments were carried out to study the effects of this Bt maize on nontarget predator H. axyridis via bitrophic interaction of adult H. axyridis feeding on Bt maize pollen and tritrophic interaction of H. axyridis consuming the lepidopteran prey. Spodoptera exigua (Hubner) neonate larvae were used to transfer Bt protein because they could survive after ingesting transgenic cry1Ab/cry2Aj maize kernels in the previous study. ELISA bioassays confirmed that the Bt protein could be transferred, but diluted through Bt maize-prey-predator. Life history parameters such as survival, development, weight, fecundity, and egg hatching rate were not significantly different when H. axyridis consumed prey that had been reared on Bt maize compared with prey reared on a nontransformed parental control. Furthermore, feeding directly on Bt maize pollen also had no detrimental effects on fitness, survival, and weight of female and male adults. In conclusion, our results indicate that transgenic cry1Ab/cry2Aj maize poses no ecological risks on the nontarget predator H. axyridis.

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