Insecticidal Activity of 11 Bt toxins and 3 Transgenic Maize Events Expressing Vip3Aa19 to Black Cutworm, Agrotis ipsilon (Hufnagel)

文献类型： 外文期刊

第一作者： Yan, Xiaorui

作者： Yan, Xiaorui;Wang, Yueqin;Wang, Zhenying;He, Kanglai;Lu, Junjiao;Ren, Meifeng;He, Yin

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关键词： Agrotis ipsilon; Bacillus thuringiensis toxins; transgenic maize events; resistance

期刊名称：INSECTS （ 影响因子：2.769； 五年影响因子：3.046 ）

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年卷期： 2020 年 11 卷 4 期

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收录情况： SCI

摘要： Black cutworm (BCW), Agrotis ipsilon (Hufnagel), is an occasional pest of maize that can cause considerable economic loss and injury to corn seedlings. This research mainly assessed the susceptibility of BCW neonates to 11 Bt toxins (Cry1Ab, Cry1Ac, Cry1Ah, Cry1F, Cry1Ie, Cry1B, Cry2Aa, Vip3_ch1, Vip3_ch4, Vip3Ca2, Vip3Aa19) by exposing neonates to an artificial diet containing Bt toxins and evaluated the efficacy of three transgenic maize events (C008, C009, C010) expressing Vip3Aa19 toxin against BCW. The toxin-diet bioassay data indicated that Vip3Aa19 protein (LC50 = 0.43 mu g/g) was the most active against BCW. Chimeric protein Vip3_ch1 (LC50 = 5.53 mu g/g), Cry1F (LC50 = 83.62 mu g/g) and Cry1Ac (LC50 = 184.77 mu g/g) were less toxic. BCW was very tolerant to the other Bt toxins tested, with LC50 values more than 200 mu g/g. Greenhouse studies were conducted with artificial infestations at the whorl stage by placing second-instar BCW larvae into whorl leaf and the fourth-instar larvae at the base of maize seedings. These results suggest that these transgenic maize events expressing Vip3Aa19 can provide effective control for BCW.

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