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Feral genetically modified herbicide tolerant oilseed rape from seed import spills: are concerns scientifically justified?

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Abstract

One of the concerns surrounding the import (for food and feed uses or processing) of genetically modified herbicide tolerant (GMHT) oilseed rape is that, through seed spillage, the herbicide tolerance (HT) trait will escape into agricultural or semi-natural habitats, causing environmental or economic problems. Based on these concerns, three EU countries have invoked national safeguard clauses to ban the marketing of specific GMHT oilseed rape events on their territory. However, the scientific basis for the environmental and economic concerns posed by feral GMHT oilseed rape resulting from seed import spills is debatable. While oilseed rape has characteristics such as secondary dormancy and small seed size that enable it to persist and be redistributed in the landscape, the presence of ferals is not in itself an environmental or economic problem. Crucially, feral oilseed rape has not become invasive outside cultivated and ruderal habitats, and HT traits are not likely to result in increased invasiveness. Feral GMHT oilseed rape has the potential to introduce HT traits to volunteer weeds in agricultural fields, but would only be amplified if the herbicides to which HT volunteers are tolerant were used routinely in the field. However, this worst-case scenario is most unlikely, as seed import spills are mostly confined to port areas. Economic concerns revolve around the potential for feral GMHT oilseed rape to contribute to GM admixtures in non-GM crops. Since feral plants derived from cultivation (as distinct from import) occur at too low a frequency to affect the coexistence threshold of 0.9% in the EU, it can be concluded that feral GMHT plants resulting from seed import spills will have little relevance as a potential source of pollen or seed for GM admixture. This paper concludes that feral oilseed rape in Europe should not be routinely managed, and certainly not in semi-natural habitats, as the benefits of such action would not outweigh the negative effects of management.

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Authors and Affiliations

  1. European Food Safety Authority, GMO Unit, Largo Natale Palli 5/A, 43121, Parma, Italy

    Yann Devos

  2. Centre for Ecology and Hydrology, Mansfield Rd, Oxford, OX1 3SR, UK

    Rosemary S. Hails

  3. INRA, Unité Eco-Innov, BP1 Campus de Grignon, 78850, Thiveral-Grignon, France

    Antoine Messéan

  4. Oaklands Barn, Lug’s Lane, Broome, Norfolk, NR35 2HT, UK

    Joe N. Perry

  5. The James Hutton Institute, Invergowrie, Dundee, DD2 5DA, UK

    Geoffrey R. Squire

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Devos, Y., Hails, R.S., Messéan, A. et al. Feral genetically modified herbicide tolerant oilseed rape from seed import spills: are concerns scientifically justified?. Transgenic Res 21, 1–21 (2012). https://doi.org/10.1007/s11248-011-9515-9

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