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首页> 外文期刊>Journal of Economic Entomology >Frequency of Alleles Conferring Resistance to the Bacillus thuringiensis Toxins Cry1Ac and Cry2Ab in Australian Populations of Helicoverpa punctigera (Lepidoptera: Noctuidae)From 2002 to 2006
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Frequency of Alleles Conferring Resistance to the Bacillus thuringiensis Toxins Cry1Ac and Cry2Ab in Australian Populations of Helicoverpa punctigera (Lepidoptera: Noctuidae)From 2002 to 2006

机译：2002年至2006年在澳大利亚棉铃虫种群中对苏云金芽孢杆菌毒素Cry1Ac和Cry2Ab产生抗性的等位基因频率

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摘要

Helicoverpa punctigera and Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) are important pests of field and horticultural crops in Australia. The former is endemic to the continent, whereas the latter is also distributed in Africa and Asia. Although H. armigera rapidly developed resistance to virtually every group of insecticide used against it, there is only one report of resistance to an insecticide in H. punctigera. In 1996 the Australian cotton industry adopted Ingard, which expresses the Bacillus thuringiensis (Bt) toxin gene crylAc. In 2004/2005, Bollgard II (which expresses Cry1Ac and Cry2Ab) replaced Ingard and has subsequently been grown on 80% of the area planted to cotton, Cossypium hirsutum L. From 2002/2003 to 2006/2007, F_2 screens were used to detect resistance to Cry1Ac or Cry2Ab. We detected no alleles conferring resistance to CrylAc; the frequency was <0.0005 (n = 2,180 alleles), with a 95% credibility interval between 0 and 0.0014. However, during the same period, we detected alleles that confer resistance to Cry2Ab at a frequency of 0.0018 (n = 2,192 alleles), with a 95% credibility interval between 0.0005 and 0.0040. For both toxins, the experiment-wise detection probability was 94%, i.e., if there actually was a resistance allele in any tested lines, we would have detected it 94% of the time. The first isolation of Cry2Ab resistance in H. punctigera was before the widespread deployment of Bollgard II. This finding supports our published notion for H. armigera that alleles conferring resistance to Cry2Ab may be present at detectable frequencies in populations before selection by transgenic crops.
机译：在澳大利亚，Helicoverpa punctigera和Helicoverpa armigera（Hübner）（鳞翅目：夜蛾科）是重要的田间和园艺作物害虫。前者是非洲大陆特有的，而后者也分布在非洲和亚洲。尽管棉铃虫对几乎所有使用杀虫剂的杀虫剂都产生了快速的抗药性，但只有一个报道称对点状杆菌有抗药性。 1996年，澳大利亚棉花业采用了Ingard，它表达苏云金芽孢杆菌（Bt）毒素基因crylAc。在2004/2005年，Bollgard II（表示Cry1Ac和Cry2Ab）取代了Ingard，随后在种植棉花的陆地棉Cossypium hirsutum L上种植了80％的土地。从2002/2003年到2006/2007年，使用F_2筛查对Cry1Ac或Cry2Ab具有抗性。我们没有检测到对CrylAc有抗性的等位基因。频率<0.0005（n = 2,180个等位基因），可信区间为95％，介于0和0.0014之间。但是，在同一时期，我们检测到以0.0018（n = 2,192个等位基因）的频率对Cry2Ab产生抗性的等位基因，其可信度在95％介于0.0005和0.0040之间。对于这两种毒素，实验方式的检测概率为94％，即，如果在任何测试品系中确实存在抗性等位基因，我们将在94％的时间内检测到。在H. punctigera中首次分离到对Cry2Ab的抗性是在Bollgard II广泛部署之前。这一发现支持了我们已公开的棉铃虫的观念，即在被转基因农作物选择之前，赋予Cry2Ab抗性的等位基因可能以可检测的频率出现在种群中。

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