Toxic Effects of Bt-(Cry1Ab+Vip3Aa) Maize on Storage Pest Paralipsa gularis (Zeller)

文献类型： 外文期刊

第一作者： Chen, Shuang

作者： Chen, Shuang;Chen, Shuang;Kang, Guodong;Yang, Xianming;Wu, Kongming;Wang, Wenhui

作者机构：

关键词： Paralipsa gularis (Zeller); Cry1Ab+Vip3Aa maize; Bt insecticidal proteins

期刊名称：TOXINS （ 影响因子：4.2； 五年影响因子：4.7 ）

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年卷期： 2024 年 16 卷 2 期

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收录情况： SCI

摘要： Paralipsa gularis (Zeller) is a storage pest; however, in recent years it has evolved into a considerable maize pest during the late growth stage in the border region between China and other Southeast Asian countries. Bt transgenic insect-resistant maize is an effective measure in controlling a wide range of lepidopteran pests, but there is a lack of research on the toxic effects of storage pests. We tested the toxicity of Bt-Cry1Ab, Vip3Aa, and their complex proteins against P. gularis via bioassay and investigated the efficiency of Bt-(Cry1Ab+Vip3Aa) maize in controlling P. gularis during the late growth stage of maize in the period 2022-2023. The bioassay results show that the susceptibilities of P. gularis to the two Bt proteins and their complex proteins were significantly different. The LC50 values of DBNCry1Ab ("DBN9936" event), DBNVip3Aa ("DBN9501" event), DBN Cry1Ab+Vip3Aa ("DBN3601T" event), and Syngenta Cry1Ab+Vip3Aa ("Bt11" event x "MIR162" event) were 0.038 mu g/g, 0.114 mu g/g, 0.110 mu g/g, and 0.147 mu g/g, and the GIC(50) values were 0.014 mu g/g, 0.073 mu g/g, 0.027 mu g/g, and 0.026 mu g/g, respectively. Determination of the expression content of the insecticidal protein in different tissues of Bt-(Cry1Ab+Vip3Aa) maize shows that the total Bt protein content in different tissues was in the following order: stalk > bract > cob > kernel. However, the bioassay results show that the mortalities of P. gularis feeding on Bt-(Cry1Ab+Vip3Aa) maize in different tissues at different growth stages were all above 93.00%. The field trial indicates that the occurrence density of larvae and plant damage rate for conventional maize were 422.10 individuals/100 plants and 94.40%, respectively, whereas no larvae were found on Bt-(Cry1Ab+Vip3Aa) maize. In summary, this study implies that Bt-(Cry1Ab+Vip3Aa) maize has a high potential for control of P. gularis, providing a new technical measure for the management of the pest.

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