数字农科院2.0

Increasing tolerance to Cry1Ac cotton from cotton bollworm, Helicoverpa armigera, was confirmed in Bt cotton farming area of China

文献类型： 外文期刊

作者： Li, Guo-Ping;Wu, Kong-Ming;Gould, Fred;Wang, Jian-Kang;Miaoi, Jin;Gao, Xi-Wu;Guo, Yu-Yuan

作者机构：

关键词： Cry1Ac;Helicoverpa armigera;Bt cotton;resistance frequency

期刊名称： ECOLOGICAL ENTOMOLOGY

ISSN： 0307-6946

年卷期： 2007 年 32 卷 4 期

页码：

收录情况： SCI

摘要： Changes in the frequency of Cry1Ac resistance genes and shifts in tolerance of cotton bollworm, Helicoverpa armigera, to the Cry1Ac toxin were assessed using bioassays of F-1 and F-2 offspring of isofemale lines from Anci County of Hebei Province (a multiple-crop system including corn, soybean, peanut, and Bt cotton) and Xiajin County of Shandong Province (an intensive Bt cotton planting area) in Northern China during 2002-2005. A conservative analysis of the overall results indicated that there was a small increase in the frequency of major, non-recessive resistance genes over time. The relative average development ratings [RADR - growth rate of a line on a Bt diet in proportion to the growth rate on a non-Bt (NBT) diet] of the bollworm larvae in F-1 tests increased significantly from year to year, indicating a gradual trend towards higher tolerance to Cry1Ac in the field populations. There were also significant positive correlations between RADR of the lines in the F-1 generation and the RADR of their F-2 offspring, indicating that the tolerance was genetically based. Quantitative genetic simulation analysis showed that resistance of H. armigera to Bt cotton in Xiajin could evolve to a high level in 11-15 years if no effective resistance management measures are carried out.

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