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Effects of tobacco genetically modified to express protease inhibitor bovine spleen trypsin inhibitor on non-target soil organisms

Published online by Cambridge University Press:  16 November 2007

Maureen O'Callaghan ,
Michael Brownbridge ,
Wendy B. Stilwell ,
Emily M. Gerard ,
Elisabeth P.J. Burgess ,
Emma I. Barraclough  and
John T. Christeller
Maureen O'Callaghan
Affiliation:
Biocontrol, Biosecurity and Bioprocessing Section, AgResearch, Lincoln Research Centre, Private Bag 4749, Christchurch, New Zealand
Michael Brownbridge
Affiliation:
Biocontrol, Biosecurity and Bioprocessing Section, AgResearch, Lincoln Research Centre, Private Bag 4749, Christchurch, New Zealand Previous address: University of Vermont, Entomology Research Lab, 661 Spear St, Burlington, VT 05405, USA
Wendy B. Stilwell
Affiliation:
Biocontrol, Biosecurity and Bioprocessing Section, AgResearch, Lincoln Research Centre, Private Bag 4749, Christchurch, New Zealand
Emily M. Gerard
Affiliation:
Biocontrol, Biosecurity and Bioprocessing Section, AgResearch, Lincoln Research Centre, Private Bag 4749, Christchurch, New Zealand
Elisabeth P.J. Burgess
Affiliation:
HortResearch, Private Bag 92 169, Auckland, New Zealand
Emma I. Barraclough
Affiliation:
HortResearch, Private Bag 92 169, Auckland, New Zealand
John T. Christeller
Affiliation:
HortResearch, Private Bag 11 030, Palmerston North, New Zealand

Abstract

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Effects of tobacco genetically modified to express the protease inhibitor bovine spleen trypsin inhibitor (BSTI) were examined in laboratory assays against three earthworm and one collembolan species. BSTI is a serine protease inhibitor that can bind to the digestive trypsins of insects feeding on modified plants, resulting in reduced growth and survival. Protease inhibitors are active against a broad range of insects, so may have a large impact on non-target organisms. Survival and fecundity of the collembolan Folsomia candida were unaffected by consumption of artificial diet containing BSTI-expressing tobacco leaf or powdered freeze-dried BSTI-expressing tobacco leaf that was added to soil. Similarly, mortality and growth of earthworms Aporrectodea caliginosa and Lumbricus rubellus did not differ significantly between soil augmented with BSTI-expressing tobacco leaves or unmodified control leaves. The redworm Eisenia fetida gained less weight when provided with BSTI-expressing leaves in one assay, but when the experiment was repeated, there was no significant difference between treatments. BSTI-expressing tobacco and unmodified control leaves decomposed at the same rate, indicating that the inhibitor had no effect on the overall function of the decomposer community of micro-flora and fauna in soil.

Keywords

environmental impactsearthwormsprotease inhibitorGM plantCollemboladecomposition
Type
Research Article
Information
Environmental Biosafety Research , Volume 6 , Issue 3 , July 2007 , pp. 183 - 195
Copyright
© ISBR, EDP Sciences, 2007

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