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Fitness of Bt-resistant cabbage loopers on Bt cotton plants

文献类型： 外文期刊

作者： Tetreau, Guillaume 1 ; Wang, Ran 1 ; Wang, Ping 1 ;

作者机构： 1.Cornell Univ, New York State Agr Expt Stn, Dept Entomol, Geneva, NY 14456 USA

2.Nanjing Agr Univ, Dept Entomol, Nanjing, Jiangsu, Peoples R China

3.Univ Perpignan, Univ Montpellier, IFREMER, IHPE UMR 5244,CNRS, Perpignan, France

4.Beijing Acad Agr & Forestry Sci, Inst Plant & Environm Protect, Beijing, Peoples R China

关键词： fitness cost of resistance;Trichoplusia ni;genetically modified cotton;Bacillus thuringiensis;Cry1Ac;Cry2Ab

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：9.803； 五年影响因子：9.555 ）

ISSN： 1467-7644

年卷期： 2017 年 15 卷 10 期

页码：

收录情况： SCI

摘要： Development of resistance to the insecticidal toxins from Bacillus thuringiensis (Bt) in insects is the major threat to the continued success of transgenic Bt crops in agriculture. The fitness of Bt-resistant insects on Bt and non-Bt plants is a key parameter that determines the development of Bt resistance in insect populations. In this study, a comprehensive analysis of the fitness of Bt-resistant Trichoplusia ni strains on Bt cotton leaves was conducted. The Bt-resistant T. ni strains carried two genetically independent mechanisms of resistance to Bt toxins Cry1Ac and Cry2Ab. The effects of the two resistance mechanisms, individually and in combination, on the fitness of the T. ni strains on conventional non-Bt cotton and on transgenic Bt cotton leaves expressing a single-toxin Cry1Ac (Bollgard I) or two Bt toxins Cry1Ac and Cry2Ab (Bollgard II) were examined. The presence of Bt toxins in plants reduced the fitness of resistant insects, indicated by decreased net reproductive rate (R-0) and intrinsic rate of increase (r). The reduction in fitness in resistant T. ni on Bollgard II leaves was greater than that on Bollgard I leaves. A 12.4-day asynchrony of adult emergence between the susceptible T. ni grown on non-Bt cotton leaves and the dualtoxin- resistant T. ni on Bollgard II leaves was observed. Therefore, multitoxin Bt plants not only reduce the probability for T. ni to develop resistance but also strongly reduce the fitness of resistant insects feeding on the plants.

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