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Two major polyacetylenes, trans -1,3,5,11-tridecatetraen-7,9-diyne and 1, cis -3, trans -5, trans -11-tridecatetraen-7,9-diyne, possessing light-activated toxicity (phototoxicity) were isolated from the leaves of Viguiera annua (M. E. Jones) Blake (Asteraceae). Despite the insecticidal properties of these polyacetylenic derivatives, a field survey revealed that larvae of Zygogramma continua Le Conte (Coleoptera: Chrysomelidae) were able to feed and develop normally on the highly phototoxic leaves of V. annua . Results suggested that the light-avoidance behaviour, and the inducibility of some antioxidant enzymes, in Z. continua larvae were important features explaining the tolerance of this insect to the phototoxic polyacetylenes occurring in V. annua . |
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