Abstract
Seedlings from the white mustard, Sinapis alba, grown under continuous far-red light exhibit enhanced plastid enzyme activities when compared with dark-grown seedlings (for review, see Mohr 1981). These activities are even more pronounced upon illumination with white light during the etioplast/chloroplast transformation. Etioplasts and etiochloroplasts from the cotyledons of such seedlings show high prenyl-lipid-synthesizing activities when [1-14C]isopentenyl diphosphate is used as the precursor. They lack, however, any enzymatic activities for the formation of isopentenyl diphosphate via the mevalonate pathway, i.e. hydroxymethylglutaryl-CoA reductase, mevalonate kinase, phosphomevalonate kinase and diphosphomevalonate decarboxylase, which are present and easily detectable within the endoplasmic reticulum and cytoplasm. These results corroborate the view that the cytoplasm of the plant cell is the only site of isopentenyl-diphosphate formation via the mevalonate pathway.
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Lütke-Brinkhaus, F., Kleinig, H. Formation of isopentenyl diphosphate via mevalonate does not occur within etioplasts and etiochloroplasts of mustard (Sinapis alba L.) seedlings. Planta 171, 406–411 (1987). https://doi.org/10.1007/BF00398686
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DOI: https://doi.org/10.1007/BF00398686