Document Detail

Electrophysiological and behavioral responses of female Helicoverpa armigera to compounds identified in flowers of African marigold, Tagetes erecta.
MedLine Citation:
PMID:  11504018     Owner:  NLM     Status:  MEDLINE    
Seven electrophysiologically active compounds were detected in air-entrained headspace samples of live flowers of Tagetes erecta analyzed by gas chromatography (GC) linked to a female Helicoverpa armigera electroantennograph (EAG) using polar and nonpolar capillary columns. These compounds were subsequently identified using GC linked to mass spectrometry as benzaldehyde, (S)-(-)-limonene, (R,S)-(+/-)-linalool, (E)-myroxide, (Z)-beta-ocimene, phenylacetaldehyde, and (R)-(-)-piperitone. Electrophysiological activity was confirmed by EAG with a 1-microg dose of each compound on filter paper eliciting EAG responses that were significantly greater than the solvent control response from female moths. Wind-tunnel bioassays with T. erecta headspace samples, equivalent to 0.4 flower/hr emission from a live flower, elicited a significant increase in the number of upwind approaches from female H. armigera relative to a solvent control. Similarly, a seven-component synthetic blend of EAG-active compounds identified from T. erecta presented in the same ratio (1.0:1.6:0.7:1.4:0.4:5.0:2.7, respectively) and concentration (7.2 microg) as found in the natural sample elicited a significant increase in the number of upwind approaches relative to a solvent control during a 12-min bioassay that was equivalent to that elicited by the natural T. erecta floral volatiles.
T J Bruce; A Cork
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of chemical ecology     Volume:  27     ISSN:  0098-0331     ISO Abbreviation:  J. Chem. Ecol.     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-08-15     Completed Date:  2001-12-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7505563     Medline TA:  J Chem Ecol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1119-31     Citation Subset:  IM    
Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent, UK.
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MeSH Terms
Air Movements
Asteraceae / chemistry*
Biological Assay
Gas Chromatography-Mass Spectrometry
Moths / physiology*

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