Document Detail

Does Cry1Ab protein affect learning performances of the honey bee Apis mellifera L. (Hymenoptera, Apidae)?
MedLine Citation:
PMID:  18206234     Owner:  NLM     Status:  MEDLINE    
Genetically modified Bt crops are increasingly used worldwide but side effects and especially sublethal effects on beneficial insects remain poorly studied. Honey bees are beneficial insects for natural and cultivated ecosystems through pollination. The goal of the present study was to assess potential effects of two concentrations of Cry1Ab protein (3 and 5000 ppb) on young adult honey bees. Following a complementary bioassay, our experiments evaluated effects of the Cry1Ab on three major life traits of young adult honey bees: (a) survival of honey bees during sub-chronic exposure to Cry1Ab, (b) feeding behaviour, and (c) learning performance at the time that honey bees become foragers. The latter effect was tested using the proboscis extension reflex (PER) procedure. The same effects were also tested using a chemical pesticide, imidacloprid, as positive reference. The tested concentrations of Cry1Ab protein did not cause lethal effects on honey bees. However, honey bee feeding behaviour was affected when exposed to the highest concentration of Cry1Ab protein, with honey bees taking longer to imbibe the contaminated syrup. Moreover, honey bees exposed to 5000 ppb of Cry1Ab had disturbed learning performances. Honey bees continued to respond to a conditioned odour even in the absence of a food reward. Our results show that transgenic crops expressing Cry1Ab protein at 5000 ppb may affect food consumption or learning processes and thereby may impact honey bee foraging efficiency. The implications of these results are discussed in terms of risks of transgenic Bt crops for honey bees.
R Ramirez-Romero; N Desneux; A Decourtye; A Chaffiol; M H Pham-Delègue
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-02-21
Journal Detail:
Title:  Ecotoxicology and environmental safety     Volume:  70     ISSN:  1090-2414     ISO Abbreviation:  Ecotoxicol. Environ. Saf.     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-04-21     Completed Date:  2008-10-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7805381     Medline TA:  Ecotoxicol Environ Saf     Country:  United States    
Other Details:
Languages:  eng     Pagination:  327-33     Citation Subset:  IM    
Instituto de Ecologia A.C., Km. 2.5 Carretera Antigua a Coatepec No. 351 El Haya, 91070 Xalapa, Veracruz, Mexico.
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MeSH Terms
Bacterial Proteins / toxicity*
Bees / drug effects*,  physiology
Endotoxins / toxicity*
Feeding Behavior / drug effects
Hemolysin Proteins / toxicity*
Insecticides / toxicity*
Learning / drug effects
Plants, Genetically Modified
Zea mays / genetics
Reg. No./Substance:
0/Bacterial Proteins; 0/Endotoxins; 0/Hemolysin Proteins; 0/Insecticides; 0/insecticidal crystal protein, Bacillus Thuringiensis

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