title: Field evaluation of effects of transgenic cry1Ab/cry1Ac, cry1C and cry2A rice on Cnaphalocrocis medinalis and its arthropod predators.
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.
authors.affiliation: Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: XueLiang
authors.initials: X
authors.lastname: Xu
authors.forename: Yu
authors.initials: Y
authors.lastname: Han
authors.forename: Gang
authors.initials: G
authors.lastname: Wu
authors.forename: WanLun
authors.initials: W
authors.lastname: Cai
authors.forename: BenQi
authors.initials: B
authors.lastname: Yuan
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.forename: FangZhou
authors.initials: F
authors.lastname: Liu
authors.forename: ManQun
authors.initials: M
authors.lastname: Wang
authors.forename: HongXia
authors.initials: H
authors.lastname: Hua
mesh_terms: D000818:Animals; D001181:Arthropods; D001413:Bacillus thuringiensis / Q000737:chemistry / Q000235:genetics / Q000472:pathogenicity; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000235:genetics*; D002681:China; D004731:Endotoxins / Q000235:genetics*; D006460:Hemolysin Proteins / Q000235:genetics*; D007814:Larva; D007915:Lepidoptera / Q000502:physiology*; D012275:Oryza / Q000033:anatomy & histology / Q000235:genetics* / Q000469:parasitology*; D010572:Pest Control, Biological / Q000379:methods*; D018515:Plant Leaves / Q000469:parasitology; D030821:Plants, Genetically Modified; D011157:Population Dynamics; D011235:Predatory Behavior
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D004731:Endotoxins; D006460:Hemolysin Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis