Independence of Morphactin and Gibberellin Effects Upon Higher Plants

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Abstract
Two fluorene-9-carboxylic acid derivatives ("morphactins") were tested as possible antagonists to gibberellic acid (GA), using the induction of amylase synthesis in barley aleurone layers as an assay. The morphactins were ineffective, either as antagonists or replacements for GA. Citrus seedlings sprayed with morphactin show both internode shortening and loss of dormancy of lateral buds. GA treatment prevented internode shortening, but not the loss of bud dormancy. The actions of morphactin and of GA may be basically independent. Mixtures may be useful for chemically shaping plants.

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