Unsaponifiable Lipid Biosynthesis in the Seedling of Euphorbia lathyris L.: A Bypass via Alcoholic Fermentation |
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Authors: | KOOPS, ANDRIES J. GROENEVELD, HENRI W. |
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Affiliation: | Department of Plant Ecology and Evolutionary Biology, University of Utrecht Lange Nieuwstraat 106, NL-3512 PN Utrecht, The Netherlands |
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Abstract: | [1-14C]-ethanol supplied to the cotyledons of 9-d-old Euphorbialathyris seedlings was rapidly incorporated into unsaponifiablelipids, particularly into sterols, latex triterpenols and intothe triterpene ketones of the epicuticular wax. The [14C]-triterpenoidproduction from ethanol was hardly affected by sucrose in theexternal medium when sucrose uptake rates were low, but whenthe uptake rate was higher the [14C]-triterpenoid productionfrom [14C]-ethanol was greatly reduced. This observation isconsistent with the proposition that at high sucrose uptakerates, some sucrose is converted into ethanol, so that the incorporationof [14C]-ethanol into triterpenoids is reduced by competitionwith endogenously formed ethanol. A calculation based on theputative daily ethanol production in the cotyledons and thedaily triterpenoid production of seedlings indicates that about10 % of the triterpenoid synthesis in vivo may be from ethanol. Ethanol, Euphorbia lathyris, fermentation, seedling, triterpenoid biosynthesis |
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