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Science China Life Sciences

, Volume 54, Issue 11, pp 1019–1028 | Cite as

Field evaluation of effects of transgenic cry1Ab/cry1Ac, cry1C and cry2A rice on Cnaphalocrocis medinalis and its arthropod predators

  • XueLiang Xu
  • Yu Han
  • Gang Wu
  • WanLun Cai
  • BenQi Yuan
  • Hui Wang
  • FangZhou Liu
  • ManQun Wang
  • HongXia Hua
Open Access
Research Papers

Abstract

The impacts of transgenic Bt rice on target pests and their predators need to be clarified prior to the commercialization of Bt rice. In this study, the percentages of folded leaves of three transgenic Bt rice lines and non-transgenic parental rice line caused by Cnaphalocrocis medinalis were studied over two successive growing seasons. In addition, the population densities, relative abundance and population dynamics of C. medinalis and four species of its natural arthropod predators were investigated at three sites in China. The results showed that rice line significantly affected the percentages of folded leaves and population densities of C. medinalis larvae. Significantly higher percentages of folded leaves were observed on the non-transgenic rice compared with the three transgenic Bt rice on most sampling dates. Significantly higher densities of C. medinalis larvae and higher relative abundance of C. medinalis within phytophages were found on non-transgenic rice compared with three transgenic Bt rice at different sites across the study period. The population dynamics of C. medinalis larvae were significantly affected by rice line, rice line×sampling date, rice line×year, rice line×sampling date×year. However, there was little, if any, significant difference in the relative abundance, population density and population dynamics of the four arthropod predators between the three Bt rice lines and non-transgenic rice. The results of this study indicate that the Bt toxin in transgenic Bt rice can effectively suppress the occurrence of C. medinalis, but has no significant effects on the occurrence of the four predatory arthropod species.

Keywords

transgenic Bt rice Cnaphalocrocis medinalis population dynamics percentages of folded leaves natural arthropod predator 

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Copyright information

© The Author(s) 2011

This article is published under license to BioMed Central Ltd. Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • XueLiang Xu
    • 1
    • 2
  • Yu Han
    • 1
  • Gang Wu
    • 1
  • WanLun Cai
    • 1
  • BenQi Yuan
    • 1
  • Hui Wang
    • 1
  • FangZhou Liu
    • 1
  • ManQun Wang
    • 1
  • HongXia Hua
    • 1
  1. 1.Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhanChina
  2. 2.Institute of Plant ProtectionJiangxi Academy of Agricultural SciencesNanchangChina

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