Abstract
The concentration of tannins in young Kalanchoe leaves decreased and malate accumulated when plants were transferred from long to short days. Metabolic fluxes and enzyme capacities involved in the shikimate pathway and in phenolic biosynthesis were thus determined under the different photoperiodic regimes. Shikimate production appears rather similar whatever the photoperiod. In contrast, the enzymes of phenolic metabolism (phenylalanine ammonialyase and p-coumarate: CoA ligase) dramatically decrease in their capacities when the plants are transferred from long days to short days. These variations of enzyme capacities probably play a major role in controlling specific metabolite accumulation according to the photoperiod.
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