Abstract
Summary Seedlings of Chenopodium rubrum were treated with several alcohols during the 13 h dark period that induces flowering. The primary alcohols (C2-C5) inhibited the induction strongly. Secondary (C3, C4) and tertiary (C4) alcohols had no significant effect. Alcohol dehydrogenase in C. rubrum seedling extracts was acting on the primary alcohols only, its kinetic properties being comparable to those of the yeast enzyme (E.C. 1.1.1.1.). The profiles for ethanol sensitivity and for alcohol dehydrogenase activity in the seedlings were not identical, although both showed a slight increase at the end of the dark period. It was concluded that the inhibition of flowering is not by interference with a membrane system but via metabolic effects on the primary inductive process. On the basis of their relative turnover velocities with alcohol dehydrogenase, n-butanol and n-pentanol are the most effective inhibitors of the compounds tested.
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