Changes of inheritance mode and fitness in Helicoverpa armigera (Hubner) (Lepidoptera : Noctuidae) along,with its resistance evolution to Cry1Ac toxin

文献类型： 外文期刊

第一作者： Wu, Kong-Ming

作者： Wu, Kong-Ming;Yu, Hong-Kun;Li, Ke-Ke;Feng, Xue;Guo, Yu-Yuan

作者机构：

关键词： Helicoverpa armigera;Bt resistance;inheritance;fitness

期刊名称：JOURNAL OF INVERTEBRATE PATHOLOGY （ 影响因子：2.841； 五年影响因子：3.368 ）

ISSN： 0022-2011

年卷期： 2008 年 97 卷 2 期

页码：

收录情况： SCI

摘要： The changes of inheritance mode and fitness of resistance in Helicoverpa armigera (Hubner) along with its resistance evolution to Cry1Ac toxin were evaluated in the laboratory. The resistance levels reached 170.0-, 209.6- and 2893.3-fold, on selection of the field population in the 16th (BtR-F-16), 34th (BtR-F-34) and 87th (BtR-F-87) generation with artificial diet containing Cry1Ac toxin, respectively. As the resistance levels increased, more larvae feeding on the Bt cotton expressing Cry1Ac toxin survived. Most larvae of BtR-F-87 could develop to the 5th instar and about 3% individuals reached the adult stage. The inheritance of Cry1Ac resistance trait at three resistant levels was autosomal and incompletely recessive, but the degree of dominance decreased as the resistance increased. The resistance was primarily monogenic in BtR-F-16 strain, but polygenic as resistance increased. The relative fitness of H. armigera, measured as a ratio of R-0 (the net replacement rate) of resistant strain divided by R-0 of the susceptible strain, decreased with an increase of the resistance levels, with ratios of 0.79, 0.64 and 0.59 in their respective BtR-F-16, BtR-F-34 and BtR-F-87 strains.

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