Impact of transgenic oilseed rape expressing oryzacystatin-1 (OC-1) and of insecticidal proteins on longevity and digestive enzymes of the solitary bee Osmia bicornis.
Konrad, R, Connor, M, Ferry, N, Gatehouse, A and Babendreier, D 2009, 'Impact of transgenic oilseed rape expressing oryzacystatin-1 (OC-1) and of insecticidal proteins on longevity and digestive enzymes of the solitary bee Osmia bicornis.' , Journal of insect physiology, 55 (4) , pp. 305-13.
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The risk that insect-resistant transgenic plants may pose for solitary bees was assessed by determining longevity of adult Osmia bicornis (O. rufa) chronically exposed to transgenic oilseed rape expressing oryzacystatin-1 (OC-1) or to the purified insecticidal proteins recombinant rOC-1, Kunitz soybean trypsin inhibitor (SBTI), Galanthus nivalis agglutinin (GNA), or Bacillus thuringiensis toxin Cry1Ab dissolved in sugar solution (at 0.01 and 0.1%, w:v, Cry1Ab only at 0.01%). Compared to control bees, longevity was significantly reduced by SBTI and GNA at both concentrations and by rOC-1 at 0.1%, but not by Cry1Ab or rOC-1 at 0.01%. Longevity on the OC-1 oilseed rape was not significantly different from the control plants. The effects of SBTI and rOC-1 on longevity were investigated through characterization of the digestive proteinases of O. bicornis and analysis of the response in proteinase profiles to ingestion of these proteinase inhibitors. A relatively complex profile of at least four types of soluble proteolytic enzymes was identified. Serine proteinases were found to be predominant, with metallo and especially cysteine proteinases making a smaller albeit significant contribution. The compensatory response to in vivo enzyme inhibition was similar for SBTI and rOC-1 although less pronounced for rOC-1. It consisted of a non-specific overproduction of native proteinases, both sensitive and insensitive, and the induction of a novel aspartic proteinase.
|Uncontrolled Keywords:||Bacillus thuringiensis toxin Cry1Ab, snowdrop lectin (GNA), kunitz soybean trypsin inhibitor (SBTI), digestive proteinase profiles, risk assessment|
|Themes:||Built and Human Environment|
|Schools:||Colleges and Schools > College of Science & Technology > School of Environment and Life Sciences|
|Journal or Publication Title:||Journal of insect physiology|
|Depositing User:||Dr Natalie Ferry|
|Date Deposited:||06 Oct 2011 14:20|
|Last Modified:||20 Aug 2013 18:11|
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