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Pyrrolizidine alkaloids of probable host-plant origin in the pronotal and elytral secretion of the leaf beetle <i>Oreina cacaliae</i>
Auteur(s)
Date de parution
1988
In
Entomologia Experimentalis et Applicata, Springer, 1988/49/1-2/55-58
Mots-clés
Résumé
<i>Oreina cacaliae</i> (Coleoptera, Chrysomelidae) produces in its elytral and pronotal defensive secretion seneciphylline N-oxide together with small amounts of another pyrrolizidine alkaloid tentatively identified as senecionine N-oxide. This is a strong departure from the chemical composition of the defensive secretions in related species, characterized by complex mixtures of cardenolides, synthesized by the beetles from cholesterol. It is suggested that <i>O. cacaliae</i> sequesters the alkaloids from its host-plant, <i>Adenostyles leucophylla</i>. Other specimens of <i>O. cacaliae</i> from far distant populations feeding on <i>Senecio nemorensis</i>, <i>Petasites paradoxus</i> or <i>P. album</i> also produced pyrrolizidine alkaloids, but not <i>O. speciosissima</i> feeding on the same food plants and producing cardenolides. In addition to pyrrolizidine alkaloids, <i>O. cacaliae</i> secretes ethanolamine, which is also found in all the cardenolide-producing species.
Identifiants
Type de publication
journal article
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