Document Detail

Appetitive and Aversive Learning in Spodoptera littoralis Larvae.
MedLine Citation:
PMID:  21653242     Owner:  NLM     Status:  Publisher    
Adult Lepidoptera are capable of associative learning. This helps them to forage flowers or to find suitable oviposition sites. Larval learning has never been seriously considered because they have limited foraging capabilities and usually depend on adults as concerns their food choices. We tested if Spodoptera littoralis larvae can learn to associate an odor with a tastant using a new classical conditioning paradigm. Groups of larvae were exposed to an unconditioned stimulus (US: fructose or quinine mixed with agar) paired with a conditioned stimulus (CS: hexanol, geraniol or pentyl acetate) in a petri dish. Their reaction to CS was subsequently tested in a petri dish at different time intervals after conditioning. Trained larvae showed a significant preference or avoidance to CS when paired with US depending on the reinforcer used. The training was more efficient when larvae were given a choice between an area where CS-US was paired and an area with no CS (or another odor). In these conditions, the memory formed could be recalled at least 24 h after pairing with an aversive stimulus and only 5 min after pairing with an appetitive stimulus. This learning was specific to CS because trained larvae were able to discriminate CS from another odor that was present during the training but unrewarded. These results suggest that Lepidoptera larvae exhibit more behavioral plasticity than previously appreciated.
Ali Salloum; Violaine Colson; Frédéric Marion-Poll
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-6-7
Journal Detail:
Title:  Chemical senses     Volume:  -     ISSN:  1464-3553     ISO Abbreviation:  -     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-6-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8217190     Medline TA:  Chem Senses     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Institut National de la Recherche Agronomique (INRA), Unité Mixte de Recherches (UMR) 1272 Physiologie de l'Insecte: Signalisation et Communication, INRA - Université Pierre et Marie Curie, 78026 Versailles Cedex, France.
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