Über die Aktivität der Synthetase und Phosphorylase in Maisblatt bei verschiedenen Stärkegehalten

Abstract

The activities of phosphorylase and synthetase in the bundle sheath cells of maize leaves were investigated in plants that as a result of different light-dark treatments contained various amounts of starch. The material coming from the dark (67 h) had almost no starch and scarcely any synthetase activity if starch granules were not added to the assay mixture as a primer. In the presence of this primer a poor synthetase activity could be detected. After 2 h in the light the leaves produced a small amount of starch and the synthetase activity increased. When starch granules were included in the test the synthetase activity was increased 3.5-fold. This value was 1.5-fold higher than the corresponding one in the dark. Plants that were in the light for 28 h contained fair amounts of starch and the synthetase activity was independent of the addition of primer. The values were 3 fold higher than those found in plants in the dark. A further increase in the synthetase activity and decrease in starch content were brought about by a dark period of 2 h following the illumination of 28 h.