Does Bt maize expressing Cry1Ac protein have adverse effects on the parasitoid Macrocentrus cingulum (Hymenoptera: Braconidae)?

• 来源期刊: 中国昆虫科学（英文版）
• 关键词: Cry1Ac toxin ELISA environmental risk assessment non-target effects parasitoids prey/host quality-mediated effects
• 年，卷（期）: 2017,（4）
• 页码范围: 599-612
• 页数: 14页
• 语种: 英文
• DOI: 10.1111/1744-7917.12352

摘要

The potential effects of insect-resistant,genetically engineered (GE) crops on non-target organisms,especially on predators and parasitoids,must be evaluated before their commercial cultivation.The effects of GE maize that produces Cry1Ac toxin on the parasitoid Macrocentrus cingulum were assessed by direct bioassay and indirect bioassay.In the indirect bioassay,parasitism rate,cocoon weight and the number of M.cingulurm progeny produced per host were significantly reduced when M.cingulum-parasitized CrylAc-susceptible Ostriniafurnacalis were fed a diet containing purified Cry1Ac;however,life-table parameters of M.cingulum were not adversely affected when the same assay was performed with Cry1Ac-resistant O.furnacalis.These results indicated that the detrimental effects detected with a Cry1Ac-susceptible host were mediated by poor host quality.In a direct bioassay,no difference in life-table parameters were detected when M.cingulum adults were directly fed a 20％ honey solution with or without Cry1Ac;however,survival and longevity were significantly reduced when M.cingulum adults were fed a honey solution containing potassium arsenate,which was used as a positive control.The stability and bioactivity of CrylAc toxin in the food sources and Cry1Ac toxin uptake by the host insect and parasitoid were confirmed by enzyme-linked immunosorbent assay and sensitive-insect bioassays.Our results demonstrate that M.cingulum is not sensitive to Cry1Ac toxin at concentrations exceeding those encountered in Bacillus thuringiensis maize fields.This study also demonstrates the power of using resistant hosts when assessing the risk of genetically modified plants on non-target organisms and will be useful for assessing other non-target impacts.