Abstract
Summary The activities of amylases in Kalanchoe daigremontiana leaves fluctuate during a day. With the light there is a twofold increase in the activity which stays stable until it darkens. The starch content rises slowly with illumination time and reaches the maximum value towards the end of the light period. In the first hours of the night a further twofold increase of the amylases activity takes place (108 μmoles reducing sugars · h −1 · mg −1 chlorophyll). This activity is maintained until starch content is high. Then a parallel decrease in starch content and amylase activity can be observed. The activity of amylases is inhibited by maltose. We suggest that the increase of amylases activity in the morning is correlated with the production of primer for starch synthesis.
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