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1 August 2010 Laboratory and Field Assessments of Prey-Mediated Effects of Transgenic Bt Rice on Ummeliata insecticeps (Araneida: Linyphiidae)
J. C. Tian, Z. C. Liu, M. Chen, Y. Chen, X. X. Chen, Y. F. Peng, C. Hu, G. Y. Ye
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Abstract

One major concern regarding the release of Bt rice is its potential impact through tritrophic interactions on nontarget arthropods, especially natural enemies. We studied the effects of two Bt transgenic rice varieties, TT9-3 and KMDl, expressing CrylAb/CrylAc and CrylAb, respectively, on a predatory ground spider [Ummeliata insecticeps (Bösenberg et Strand)] supplied with Bt rice-fed brown planthopper [Nilaparvata lugens (Stål)] nymphs. Although immunoassays confirmed that U. insecticeps ingested Bt insecticidal protein when supplied with Bt rice-fed N. lugens, no negative effects were found on its survival and development. Furthermore, the fecundity of U. insecticeps fed prey reared on Bt rice was not significantly different from that of those fed prey reared on non-Bt rice. A 3-yr field trial indicated that Bt rice did not significantly affect the population density of U. insecticeps in comparison with non-Bt rice. In conclusion, the Bt rice lines tested in this study had no adverse effects on the survival, developmental time, or fecundity of U insecticeps in the laboratory or on population dynamics in the field.

© 2010 Entomological Society of America
J. C. Tian, Z. C. Liu, M. Chen, Y. Chen, X. X. Chen, Y. F. Peng, C. Hu, and G. Y. Ye "Laboratory and Field Assessments of Prey-Mediated Effects of Transgenic Bt Rice on Ummeliata insecticeps (Araneida: Linyphiidae)," Environmental Entomology 39(4), 1369-1377, (1 August 2010). https://doi.org/10.1603/EN10003
Received: 3 January 2010; Accepted: 16 April 2010; Published: 1 August 2010
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KEYWORDS
Bacillus thuringiensis
Bt rice
nontarget effect
tritrophic interactions
Ummeliata insecticeps
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