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  4. Genetic and Environmental Sources of Variation in the Autogenous Chemical Defense of a Leaf Beetle
 
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Genetic and Environmental Sources of Variation in the Autogenous Chemical Defense of a Leaf Beetle

Auteur(s)
Triponez, Yann
Editeur(s)
Naisbit, Russell. E.
Jean-Denis, J. B.
Rahier, Martine 
Institut de biologie 
Alvarez, Nadir
Date de parution
2007
In
Journal of Chemical Ecology, Revista Iberoamericana de Micología, 2007/33/11/2011-2024
Mots-clés
  • Chrysomelidae

  • <i>Oreina speciosa</i...

  • chemical defense

  • cardenolides

  • intraspecific variati...

  • host-plant use

  • genetic constraints

  • HPLC–MS

Résumé
Chemical defense plays a central role for many herbivorous insects in their interactions with predators and host plants. The leaf beetle genus <i>Oreina</i> (Coleoptera, Chrysomelidae) includes species able to both sequester pyrrolizidine alkaloids and autogenously produce cardenolides. Sequestered compounds are clearly related to patterns of host-plant use, but variation in <i>de novo</i> synthesized cardenolides is less obviously linked to the environment. In this study, intraspecific variation in cardenolide composition was examined by HPLC–MS analysis in 18 populations of <i>Oreina speciosa</i> spanning Europe from the Massif Central to the Balkans. This revealed the defense secretion to be a complex blend of up to 42 compounds per population. There was considerable geographical variation in the total sample of 50 compounds detected, with only 14 found in all sites. The environmental and genetic influences on defense chemistry were investigated by correlation with distance matrices based on habitat factors, host-plant use, and genetics (sequence data from <i>COI</i>, <i>COII</i>, and <i>16s rRNA</i>). This demonstrated an influence of both genetics and host-plant use on the overall blend of cardenolides and on the presence of some of the individual compounds. The implications of this result are discussed for the evolution of defense chemistry and for the use of cardenolide compounds as markers of the evolutionary history of the species.
URI
https://libra.unine.ch/handle/123456789/16824
DOI
10.1007/S10886-007-9351-9
Autre version
http://dx.doi.org/10.1007/S10886-007-9351-9
Type de publication
Resource Types::text::journal::journal article
Dossier(s) à télécharger
 main article: Triponez_Y._-_Genetic_and_Environmental_Sources_of_Variation_20080425.pdf (381.02 KB)
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