Der Einfluß von Ancymidol und Ethrel auf den Gibberellinsäuregehalt (GA3) von Getreidepflanzen

Influence of Ancymidol and Ethrel on the synthesis of gibberellic acid (GA₃) in cereal plants. In pot experiments with oat, barley and rye both growth regulators Ancymidol and Ethrel considerably reduced the GA₃ content in the 3 plant species. Ancymidol was approximately 10 times more effective than Ethrel. This higher effectivity of Ancymidol on the GA₃ content and the different structure of the Ancymidol molecule compared to Ethrel makes it probable that Ancymidol inhibits the GA synthesis in a different way than Ethrel (or CCC). Although Ethrel was less effective in reducing the GA content it decreased the stalk length more than Ancymidol. It is concluded that Ethrel not only influences the GA induced growth but also other processes which regulate the length growth of plants.