Effects of Cry1 Ac toxin of Bacillus thuringiensis and nuclear polyhedrosis virus of Helicoverpa armigera (Hubner) (Lepidoptera : Noctuidae) on larval mortality and pupation

文献类型： 外文期刊

第一作者： Liu, Xiaoxia

作者： Liu, Xiaoxia;Zhang, Qingwen;Xu, Baoliang;Li, Jiancheng

作者机构：

关键词： Bt;HaNPV;combination;additive;antagonism

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.845； 五年影响因子：4.674 ）

ISSN： 1526-498X

年卷期： 2006 年 62 卷 8 期

页码：

收录情况： SCI

摘要： In the laboratory, the percentage mortality and pupation of Helicoverpa armigera (Hubner) were investigated when larvae were exposed to Cry1Ac of Bacillus thuringiensis Berliner, nuclear polyhedrosis virus of H. armigera (HaNPV) or Cry1Ac and HaNPV together. The results revealed that interactions between Cry1Ac and HaNPV varied with bioassay method and concentration of the suspension. When larvae were infected using a suspension containing both HaNPV and Cry1Ac, most combinations of Cry1Ac (62.5, 125 and 250 mu g mL(-1)) and HaNPV (1.2 x 10(6), 6.0 x 10(6) and 3.0 x 10(7) PIB mL(-1)) showed an antagonistic effect. In the bioassay procedure where larvae were force fed diet containing Cry1Ac 48 h after being infected by HaNPV, interaction between Cry1Ac (0.5, 1, 2, 4 and 8 mu g mL(-1)) and HaNPV (6.0 x 106 and 3.0 x 10(7) PIB mL-1) showed an additive effect, while combinations of Cry1Ac (0.5, 1, 2 and 4 mu g mL(-1)) and HaNPV (1.2 x 106 PIB mL-1) showed an antagonistic effect. In the bioassay procedure where larvae being infected by HaNPV were fed on Cry1Ac diet from neonate to death or pupation, the results suggested that Cry1Ac and HaNPV showed an additive interaction. The percentage mortality was lower in the treatment of larvae infected by transgenic Bt cotton leaf discs containing HaNPV suspension than in the treatment of larvae by conventional cotton leaf discs containing HaNPV, while the pupation rate was higher. The combination of Bt cotton and HaNPV showed antagonism. The present results showed that a combination of Cry1Ac and HaNPV usually resulted in mortality levels greater than in the case of Cry1Ac but not greater than with the virus alone. (c) 2006 Society of Chemical Industry

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