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首页> 外文期刊>Journal of Economic Entomology >Susceptibilities of Geographic Populations of Helicoverpa zea (Lepidoptera: Noctuidae) in Mexico to Bt partial derivative-Endotoxins Cry1Ac and Cry2Ab: An 18-Yr Study
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Susceptibilities of Geographic Populations of Helicoverpa zea (Lepidoptera: Noctuidae) in Mexico to Bt partial derivative-Endotoxins Cry1Ac and Cry2Ab: An 18-Yr Study

机译：Helicoverpa Zea（Lepidoptera：Noctuidae）在墨西哥到BT部分衍生物 - 内毒素Cry1Ac和Cry2ab：18年代的研究

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An insect resistance monitoring program was developed for Mexico to accommodate the commercial introduction and stewardship of Bt cotton. Between 1998 and 2015, field-collected geographic populations of Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae) were evaluated against Cry1Ac and Cry2Ab proteins of Bacillus thuringiensis Berliner (Bacillales: Bacillaceae) to establish baseline susceptibility data before the commercial use of Bollgard (Cry1Ac) and Bollgard II (Cry1Ac and Cry2Ab) cotton. An annual monitoring program was subsequently established in which a single diagnostic concentration of each Bt protein was used in a diet overlay bioassay. The diagnostic concentration represented the concentration where larvae, evaluated in baseline studies, were reduced in weight by >= 97% relative to untreated controls or failed to molt to third instar after 5 d. In the monitoring study, populations were tested against Cry1Ac from 1998 through 2015, and against Cry2Ab from 2002 through 2004 and again from 2007 through 2015. None of the Cry1Ac-exposed larvae tested during the 18-yr period reached the third larval instar after an exposure of 5 d, and weight reduction relative to untreated control larvae was uniform at about 98-99%. For the 12 yr of Cry2Ab monitoring, no larvae reached third instar, and weight reduction was uniform at > 97% relative to controls. These results indicate that H. zea susceptibility to Cry1Ac and Cry2Ab has not changed during the period Bollgard and Bollgard II have been cultivated in Mexico.
机译：为墨西哥开发了一种抗虫监测计划，以适应BT棉的商业介绍和管理。在1998年至2015年间，针对Helicoverpa Zea（Boddie）（甲脒肽：Noctuidae）的现场收集的地理种群进行了评估了芽孢杆菌伯林（Bacillales：Bacillaceae）的Cry1ac和Cry2ab蛋白，以在商业用途之前建立基线易感性数据（Cry1ac ）和Bollgard II（Cry1Ac和Cry2ab）棉。随后建立了年度监测程序，其中在饮食覆盖生物测定中使用每个BT蛋白的单一诊断浓度。诊断浓度表示基线研究中评价的幼虫的浓度，相对于未处理的对照，重量％减去> = 97％，或者在5天后未被摩尔至第三瞬间。在监测研究中，从1998年到2015年，从1998年到2002年到2004年和2007年到2015年再次测试群体，并再次从2007年到2015年。在18年代期间，在18年代期间测试的Cry1AC暴露的幼虫没有达到第三次幼虫暴露5d，相对于未处理的对照幼虫的重量减轻，约98-99％均匀。对于12年的Cry2ab监测，没有幼虫达到第三龄，相对于对照，重量减少为> 97％。这些结果表明，在墨西哥植物期间，H. Zea对Cry1ac和Cry2ab的易感性没有改变。

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