Abstract
The accumulation and biosynthesis of sterols and fungal elicitor-inducible sesquiterpenoids by tobacco (Nicotiana tabacum) cell suspension cultures were examined as a function of a 10 day culture cycle. Sterols accumulated concomitantly with fresh weight gain. The rate of sterol biosynthesis, measured as the incorporation rate of [14C]acetate and [3H]mevalonate, was maximal when the cultures entered into their rapid phase of growth. Changes in squalene synthetase enzyme activity correlated more closely with thein vivo synthesis rate and accumulation of sterols than 3-hydroxy-3-methylglutaryl CoA reductase (HMGR) enzyme activity. Cell cultures entering into the rapid phase of growth also responded maximally to fungal elicitor as measured by the production of capsidiol, an extracellular sesquiterpenoid. However, the rate of sesquiterpenoid biosynthesis, measured as the incorporation rate of [14C]acetate and [3H]mevalonate, could not be correlated with elicitor-inducible HMGR or sesquiterpene cyclase enzyme activities, nor elicitor-suppressible squalene synthetase enzyme activity.
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Abbreviations
- FPP:
-
farnesyl diphosphate
- HMGR:
-
3-hydroxy-3-methylglutaryl coenzyme A reductase
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Chappell, J., Von Lanken, C., Vögeli, U. et al. Sterol and sesquiterpenoid biosynthesis during a growth cycle of tobacco cell suspension cultures. Plant Cell Reports 8, 48–52 (1989). https://doi.org/10.1007/BF00735777
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DOI: https://doi.org/10.1007/BF00735777