Abstract
The sensitivity of the cereal leaf beetle, Oulema melanopus (Coleoptera: Chrysomelidae), to maize-expressed Bacillus thuringiensis (Bt) proteins was investigated in the present study. Neonate larvae of O. melanopus were caged on leaves of Cry3Bb1-expressing (MON88017) or Cry1Ab-expressing (MON810) Bt maize, the corresponding near-isolines, or two non-related, conventional maize varieties. Larval survival was reduced on Cry3Bb1-expressing, but not on Cry1Ab-expressing maize compared with conventional varieties. Differences among conventional varieties were also present. The amount of eaten leaf material, developmental time to prepupal stage, and prepupal weight did not differ between Bt maize varieties and their corresponding near-isolines. In an additional feeding study with newly emerged adults, survival and beetle weight did not differ when leaves of Cry3Bb1-expressing maize or the near-isoline were offered as food over 3 weeks. ELISA measurements revealed that larvae feeding on Bt maize contained rather high Cry3Bb1 or Cry1Ab levels, which were in the same order of magnitude as the leaves. In contrast, concentrations in feces were one order, and concentrations in prepupae and adults two orders of magnitude lower.
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Acknowledgments
We are grateful to Franz Bigler and Fernando Álvarez-Alfageme for their valuable comments on an earlier draft of the manuscript and to Monsanto Company for providing maize seeds for the Bt and near-isogenic varieties.
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Meissle, M., Knecht, S., Waldburger, M. et al. Sensitivity of the cereal leaf beetle Oulema melanopus (Coleoptera: Chrysomelidae) to Bt maize-expressed Cry3Bb1 and Cry1Ab. Arthropod-Plant Interactions 6, 203–211 (2012). https://doi.org/10.1007/s11829-011-9178-8
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DOI: https://doi.org/10.1007/s11829-011-9178-8