Evaluation of Bt Corn with Pyramided Genes on Efficacy and Insect Resistance Management for the Asian Corn Borer in China

文献类型： 外文期刊

第一作者： Zhang, Tiantao

作者： Zhang, Tiantao;Bai, Shuxiong;Wang, Zhenying;He, Kanglai

作者机构：

期刊名称：PLoS One （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2016 年 11 卷 12 期

页码：

收录情况： SCI

摘要： A Bt corn hybrid (Acle) with two Bt genes (cryl le and cryl Ac) was derived by breeding stack from line expressing Cryl le and a line expressing Cryl Ac. Efficacy of this pyramided Bt corn hybrid against the Asian corn borer (ACB), Ostrinia furnacalis, was evaluated. We conducted laboratory bioassays using susceptible and resistant ACB strains fed on artificial diet or fresh plant tissues. We also conducted field trials with artificial infestations of ACB neonates at the V6 and silk stages. The toxin -diet bioassay data indicated that mixtures of Cryl Ac and Cryl le proteins had synergistic insecticidal efficacy. The plant tissue bioassay data indicated that Bt corn hybrids expressing either a single toxin (Cryl Ac or Cryl le) or two toxins had high efficacy against susceptible ACB. Damage ratings in the field trials indicated that the Bt corn hybrids could effectively protect against 1st and the 2' generation ACB in China. The hybrid line with two Bt genes showed a higher efficacy against ACB larvae resistant to Cryl Ac or Cryle than the hybrid containing one Bt gene, and the two gene hybrid would have increased potential for managing or delaying the evolution of ACB resistance to Bt corn plants.

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