In vivo synthesis of stigmasterol in Nicotiana tabacum |
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Authors: | Claus Grunwald |
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Affiliation: | Illinois Natural History Survey and Department of Plant Biology, University of Illinois, Champaign, IL 61820, U.S.A. |
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Abstract: | Six-day-old tobacco seedlings rapidly incorporated and metabolized exogenously supplied [4-14C]-sitosterol, but none of the radioactivity was recovered from stigmasterol. However, exogenously supplied [2-14C]-mevalonic acid was incorporated into both sitosterol and stigmasterol. Based on these results it is suggested that the biosynthetic pathway of stigmasterol is not via sitosterol but that both sterols have a common precursor. |
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Keywords: | Solanaceae tobacco phytosterols stigmasterol sitosterol biosynthesis. |
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