Toxicity of nonhost phototoxins to parsnip webworms(Lepidoptera: Oecophoridae) |
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| Authors: | May R Berenbaum Keywan Lee |
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| Institution: | (1) Department of Entomology, University of Illinois, 320 Morrill Hall, 505 S. Goodwin Ave, 61801-3795 Urbana, Illinois, USA;(2) Present address: Laboratory of Plant Pigment Biochemistry and Photobiology, University of Illinois, 202 ABL, 1302 W. Pennsylvania Ave., 61801 Urbana, Illinois, USA |
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| Abstract: | Summary The parsnip webworm,Depressaria pastinacella (Lepidoptera: Oecophoridae), feeds exclusively on apiaceous hostplants containing furanocoumarins, compounds capable of oxygen-dependent and oxygen-independend photosensitization. Despite high titers of antioxidant enzymes relative to other herbivorous insects, webworms cannot tolerate nonhost photosensitizers such as alpha-terthienyl or beta-carboline alkaloids at dietary concentrations of 0.01% or less. Tolerance of skimmianine, a furano-quinoline alkaloid, may be due to its structural resemblance to furanocoumarins, which are metabolized by cytochrome P450 monooxygenases in this species. |
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| Keywords: | phototoxicity harmane harmine harmalol alpha-terthienyl skimmianine Lepidoptera Oecophoridae Depressaria pastinacella parsnip webworm |
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