Transgenic Research

, Volume 21, Issue 1, pp 77–88 | Cite as

Determination of insecticidal Cry1Ab protein in soil collected in the final growing seasons of a nine-year field trial of Bt-maize MON810

  • Helga Gruber
  • Vijay Paul
  • Heinrich H. D. Meyer
  • Martin Müller
Original Paper

Abstract

Cultivation of genetically modified maize (Bt-maize; event MON810) producing recombinant δ-endotoxin Cry1Ab, leads to introduction of the insecticidal toxin into soil by way of root exudates and plant residues. This study investigated the fate of Cry1Ab in soil under long-term Bt-maize cultivation in an experimental field trial performed over nine growing seasons on four South German field sites cultivated with MON810 and its near isogenic non Bt-maize variety. Cry1Ab protein was quantified in soil (<2 mm size) using an in-house validated ELISA method. The assay was validated according to the criteria specified in European Commission Decision 2002/657/EC. The assay enabled quantification of Cry1Ab protein at a decision limit (CCα) of 2.0 ng Cry1Ab protein g−1 soil with analytical recovery in the range 49.1–88.9%, which was strongly correlated with clay content. Cry1Ab protein was only detected on one field site at concentrations higher than the CCα, with 2.91 and 2.57 ng Cry1Ab protein g−1 soil in top and lower soil samples collected 6 weeks after the eighth growing season. Cry1Ab protein was never detected in soil sampled in the spring before the next farming season at any of the four experimental sites. No experimental evidence for accumulation or persistence of Cry1Ab protein in different soils under long-term Bt-maize cultivation can be drawn from this field study.

Keywords

Soil Genetically modified maize Bt-maize MON810 Long-term field trial Cry1Ab protein Biosafety ELISA 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Helga Gruber
    • 1
    • 2
    • 4
  • Vijay Paul
    • 2
    • 3
  • Heinrich H. D. Meyer
    • 2
  • Martin Müller
    • 1
  1. 1.Bavarian State Research Center for AgricultureInstitute for Crop Science and Plant BreedingFreisingGermany
  2. 2.Physiology WeihenstephanTechnische Universität MünchenFreisingGermany
  3. 3.National Research Centre on Yak, (ICAR)West Kameng District, Arunachal PradeshIndia
  4. 4.Bavarian Health and Food Safety AuthorityOberschleissheimGermany

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