Abstract
Stramonium and belladonna were administered single 100-mcg. doses of gibberellic acid by application to the uppermost leaves of the plants. Growth and alkaloid patterns following treatment are described. A modified assay procedure for 25-mg. samples of material is outlined. The total plant alkaloids in treated stramonium were slightly less than controls at each harvest period. Total root alkaloid production, however, was increased about 50 per cent. Interesting differences in fresh and dry weights were induced in belladonna at different stages of maturity. Younger seedlings indicated significantly decreased growth, whereas older plants demonstrated significant increases. Due to increased growth the older plants displayed about a 3 2 per cent increase in total alkaloid production. The age of the plant when treated appeared to be an important factoi in causing increased alkaloid production.
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