Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 103, Issue 42, Pages 15497-15501Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0605921103
Keywords
acquired metabolite; chemical defense; insect antifeedant; Lepidoptera; sequestration
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Funding
- NIAID NIH HHS [AI02908, R01 AI002908] Funding Source: Medline
- NIGMS NIH HHS [GM 53830, R01 GM053830] Funding Source: Medline
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Pinoresinol, a lignan of wide distribution in plants, is found to occur as a minor component in the defensive secretion produced by glandular hairs of caterpillars of the cabbage butterfly, Pieris rapae. The compound or a derivative is appropriated by the larva from its normal food plant (the cabbage, Brassica oleracea). Pinoresinol was shown to be absent from the secretion if the larva was given a cabbage-free diet but present in the effluent if that diet was supplemented with pinoresinol. Pinoresinol is shown to be a feeding deterrent to ants (Formica exsectoides), indicating that it can complement the defensive action of the primary components of the secretion, a set of previously reported lipids called mayolenes. In the test with F. exsectoides, pinoresinol proved to be more potent than concomitantly tested mayolene-16.
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