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Early Warning of Cotton Bollworm Resistance Associated with Intensive Planting of Bt Cotton in China ( Helicoverpa armigera Resistance to Cry1Ac in China)

Transgenic crops producing Bacillus thuringiensis (Bt) toxins kill some key insect pests, but evolution of resistance by pests can reduce their efficacy. The predominant strategy for delaying pest resistance to Bt crops requires refuges of non-Bt host plants to promote survival of susceptible pests.... Full description

Journal Title: PLoS ONE 2011, Vol.6(8), p.e22874
Main Author: Zhang, Haonan
Other Authors: Yin, Wei , Zhao, Jing , Jin, Lin , Yang, Yihua , Wu, Shuwen , Tabashnik, Bruce E , Wu, Yidong
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1932-6203 ; DOI: 10.1371/journal.pone.0022874
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recordid: plos10.1371/journal.pone.0022874
title: Early Warning of Cotton Bollworm Resistance Associated with Intensive Planting of Bt Cotton in China ( Helicoverpa armigera Resistance to Cry1Ac in China)
format: Article
creator:
  • Zhang, Haonan
  • Yin, Wei
  • Zhao, Jing
  • Jin, Lin
  • Yang, Yihua
  • Wu, Shuwen
  • Tabashnik, Bruce E
  • Wu, Yidong
subjects:
  • Research Article
  • Agriculture
  • Biology
  • Genetics And Genomics
  • Plant Biology
  • Biotechnology
  • Evolutionary Biology
ispartof: PLoS ONE, 2011, Vol.6(8), p.e22874
description: Transgenic crops producing Bacillus thuringiensis (Bt) toxins kill some key insect pests, but evolution of resistance by pests can reduce their efficacy. The predominant strategy for delaying pest resistance to Bt crops requires refuges of non-Bt host plants to promote survival of susceptible pests. To delay pest resistance to transgenic cotton producing Bt toxin Cry1Ac, farmers in the United States and Australia planted refuges of non-Bt cotton, while farmers in China have relied on “natural” refuges of non-Bt host plants other than cotton. Here we report data from a 2010 survey showing field-evolved resistance to Cry1Ac of the major target pest, cotton bollworm ( Helicoverpa armigera ), in northern China. Laboratory bioassay results show that susceptibility to Cry1Ac was significantly lower in 13 field populations from northern China, where Bt cotton has been planted intensively, than in two populations from sites in northwestern China where exposure to Bt cotton has been limited. Susceptibility to Bt toxin Cry2Ab did not differ between northern and northwestern China, demonstrating that resistance to Cry1Ac did not cause cross-resistance to Cry2Ab, and implying that resistance to Cry1Ac in northern China is a specific adaptation caused by exposure to this toxin in Bt cotton. Despite the resistance detected in laboratory bioassays, control failures of Bt cotton have not been reported in China. This early warning may spur proactive countermeasures, including a switch to transgenic cotton producing two or more toxins distinct from Cry1A toxins.
language: eng
source:
identifier: E-ISSN: 1932-6203 ; DOI: 10.1371/journal.pone.0022874
fulltext: fulltext
issn:
  • 1932-6203
  • 19326203
url: Link


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titleEarly Warning of Cotton Bollworm Resistance Associated with Intensive Planting of Bt Cotton in China ( Helicoverpa armigera Resistance to Cry1Ac in China)
creatorZhang, Haonan ; Yin, Wei ; Zhao, Jing ; Jin, Lin ; Yang, Yihua ; Wu, Shuwen ; Tabashnik, Bruce E ; Wu, Yidong
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subjectResearch Article ; Agriculture ; Biology ; Genetics And Genomics ; Plant Biology ; Biotechnology ; Evolutionary Biology
descriptionTransgenic crops producing Bacillus thuringiensis (Bt) toxins kill some key insect pests, but evolution of resistance by pests can reduce their efficacy. The predominant strategy for delaying pest resistance to Bt crops requires refuges of non-Bt host plants to promote survival of susceptible pests. To delay pest resistance to transgenic cotton producing Bt toxin Cry1Ac, farmers in the United States and Australia planted refuges of non-Bt cotton, while farmers in China have relied on “natural” refuges of non-Bt host plants other than cotton. Here we report data from a 2010 survey showing field-evolved resistance to Cry1Ac of the major target pest, cotton bollworm ( Helicoverpa armigera ), in northern China. Laboratory bioassay results show that susceptibility to Cry1Ac was significantly lower in 13 field populations from northern China, where Bt cotton has been planted intensively, than in two populations from sites in northwestern China where exposure to Bt cotton has been limited. Susceptibility to Bt toxin Cry2Ab did not differ between northern and northwestern China, demonstrating that resistance to Cry1Ac did not cause cross-resistance to Cry2Ab, and implying that resistance to Cry1Ac in northern China is a specific adaptation caused by exposure to this toxin in Bt cotton. Despite the resistance detected in laboratory bioassays, control failures of Bt cotton have not been reported in China. This early warning may spur proactive countermeasures, including a switch to transgenic cotton producing two or more toxins distinct from Cry1A toxins.
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titleEarly Warning of Cotton Bollworm Resistance Associated with Intensive Planting of Bt Cotton in China ( Helicoverpa armigera Resistance to Cry1Ac in China)
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abstractTransgenic crops producing Bacillus thuringiensis (Bt) toxins kill some key insect pests, but evolution of resistance by pests can reduce their efficacy. The predominant strategy for delaying pest resistance to Bt crops requires refuges of non-Bt host plants to promote survival of susceptible pests. To delay pest resistance to transgenic cotton producing Bt toxin Cry1Ac, farmers in the United States and Australia planted refuges of non-Bt cotton, while farmers in China have relied on “natural” refuges of non-Bt host plants other than cotton. Here we report data from a 2010 survey showing field-evolved resistance to Cry1Ac of the major target pest, cotton bollworm ( Helicoverpa armigera ), in northern China. Laboratory bioassay results show that susceptibility to Cry1Ac was significantly lower in 13 field populations from northern China, where Bt cotton has been planted intensively, than in two populations from sites in northwestern China where exposure to Bt cotton has been limited. Susceptibility to Bt toxin Cry2Ab did not differ between northern and northwestern China, demonstrating that resistance to Cry1Ac did not cause cross-resistance to Cry2Ab, and implying that resistance to Cry1Ac in northern China is a specific adaptation caused by exposure to this toxin in Bt cotton. Despite the resistance detected in laboratory bioassays, control failures of Bt cotton have not been reported in China. This early warning may spur proactive countermeasures, including a switch to transgenic cotton producing two or more toxins distinct from Cry1A toxins.
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doi10.1371/journal.pone.0022874
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date2011-08-09