[Effect of a morphactin on the synthesis of amylase in barley endosperm].

The morphactins - derivatives of fluorene-9-carboxylic acid -are often called "antigibberellins". A competitive inhibitor of gibberellic acid (GA) should be expected to inhibit the GA-induced synthesis of α-amylase, so a morphactin was tested in the barley endosperm bioassay. The morphactin did not have any effect on amylase biosynthesis, either with or without simultaneous application of GA. Therefore morphactins are not competitive inhibitors of the gibberellins.