Abstract
The cardenolide content of the gut, wings, and fat body ofOncopeltus fasciatus was examined. The female fat body contained 4–5% of the total cardenolide content of the insect. The cardenolide content of male fat body, and gut and wings of both sexes was below the detection limit of the cardenolide assay. Thin-layer chromatography was used to determine the cardenolide array of various tissues and secretions ofO. fasciatus reared on seeds of a single species of milkweed (A. Speciosa) and adult extracts and dorsolateral space fluid ofO. fasciatus reared on seeds of two species of milkweed with different cardenolide arrays (A. speciosa andA. syriaca). Our results indicate that cardenolides are not sequestered in the insect simply on the basis of polarity and that metabolism and differential excretion of cardenolides are involved in the sequestration of cardenolides inO. fasciatus. The similarities in the cardenolide profiles ofO. fasciatus reared on different food sources, and tissues ofO. fasciatus reared on a single food source indicates that there is regulation of the cardenolide array inO. Fasciatus.
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Moore, L.V., Scudder, G.G.E. Selective sequestration of milkweed (Asclepias sp.) cardenolides inOncopeltus fasciatus (Dallas) (Hemiptera: Lygaeidae). J Chem Ecol 11, 667–687 (1985). https://doi.org/10.1007/BF00988575
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DOI: https://doi.org/10.1007/BF00988575