Logo du site
  • English
  • Français
  • Se connecter
Logo du site
  • English
  • Français
  • Se connecter
  1. Accueil
  2. Université de Neuchâtel
  3. Publications
  4. Detoxification of pyrrolizidine alkaloids by the harvestman <i>Mitopus morio</i> (Phalangidae) a predator of alkaloid defended leaf beetles
 
  • Details
Options
Vignette d'image

Detoxification of pyrrolizidine alkaloids by the harvestman <i>Mitopus morio</i> (Phalangidae) a predator of alkaloid defended leaf beetles

Auteur(s)
Hartmann, Thomas
Editeur(s)
Häggström, Håkan
Theuring, Claudine
Lindigkeit, Rainer
Rahier, Martine 
Institut de biologie 
Date de parution
2003
In
Chemoecology, Springer (Birkhäuser), 2003/13/3/123-127
Mots-clés
  • Alkaloid sequestratio...

  • Detoxification

  • Chemical defense

  • <i>Mitopus morio</i>

  • <i>Oreina</i> leaf be...

  • Predation

  • Pyrrolizidine alkaloi...

Résumé
The harvestman <i>Mitopus morio</i> (Phalangidae) is a generalist predator. It is known to prey on larvae of the chrysomelid leaf beetle <i>Oreina cacaliae</i> defended by plant acquired pyrrolizidine alkaloids (PAs). Tracer feeding experiments were performed to determine how harvestmen tolerate protoxic PAs. Minced meat containing either [<sup>14</sup>C]senecionine or [<sup>14</sup>C]senecionine <i>N</i>-oxide was fed to <i>M. morio</i> and subsequently feces and bodies were analyzed. Labeled alkaloid <i>N</i>-oxide remained stable and was eliminated almost unaltered with the feces; only 10% was recovered as tertiary PA. In contrast, approximately 80% of labeled tertiary alkaloid (senecionine) ingested with the diet was <i>N</i>-oxidized and eliminated; the remaining 20% consisted of unchanged senecionine and a polar metabolite of unknown structure. Harvestmen process their diet by excreting digestive juice, indicated by bleaching of the meat color. Analysis of the processed diet revealed some N-oxidation of [<sup>14</sup>C]senecionine, suggesting the gut as the site of <i>N</i>-oxidation. Analysis of the bodies of harvestmen 80 hours after the tracer feeding pulse revealed only trace amounts of the polar metabolite. Neither senecionine nor its <i>N</i>-oxide could be detected in the body extracts. The results are discussed in relation to the strategies of PA adapted insects to avoid accumulation of tertiary PAs in living tissues.
URI
https://libra.unine.ch/handle/123456789/15130
DOI
10.1007/s00049-003-0236-2
Autre version
http://dx.doi.org/10.1007/s00049-003-0236-2
Type de publication
Resource Types::text::journal::journal article
Dossier(s) à télécharger
 main article: H_ggstr_m_Hakan_-_Predation_of_pyrrolizidine_alkoid_20090804.pdf (301.87 KB)
google-scholar
Présentation du portailGuide d'utilisationStratégie Open AccessDirective Open Access La recherche à l'UniNE Open Access ORCID

Adresse:
UniNE, Service information scientifique & bibliothèques
Rue Emile-Argand 11
2000 Neuchâtel

Construit avec Logiciel DSpace-CRIS Maintenu et optimiser par 4Sciences

  • Paramètres des témoins de connexion
  • Politique de protection de la vie privée
  • Licence de l'utilisateur final