A reappraisal of sterol biosynthesis and metabolism in aphids |
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Authors: | Bruce C Campbell WDavid Nes |
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Institution: | Western Regional Research Center, USDA-ARS, Berkeley, CA 94710, USA |
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Abstract: | Aphids of Schizaphis graminum (Rondani) (biotype C) reared on its host-plant, Sorghum bicolor (L.) Moench, sequestered campesterol, stigmasterol and sitosterol. Aphids reared for 72 hr on holidic diets supplemented with 4-14C]-sitosterol contained both 14C]-sitosterol and 14C]-cholesterol, indicating that these aphids are capable of dealkylation at C-24. When aphids were reared on artificial diets containing 2-14C]-mevalonic acid, no detectable amounts of radioactively labelled desmethyl sterols, nor metabolic intermediates in sterol synthesis (i.e. squalene, 2,3-oxidosqualene, 4,4-dimethyl and 4-monomethyl sterols) were found to accumulate in their tissues. The relevance of these findings to previous research suggesting the ability of aphids, via their symbiotes, to synthesize sterols is discussed. |
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Keywords: | Aphids sterol metabolism sorghum cholesterol sitosterol greenbug |
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