Abstract
The phytohormones auxin, kinetin and gibberellin A3 as well as salicylic acid have been infiltrated in various concentrations into the leaves of the qualitative long day plant Hyoscyamus niger. Only gibberellin induced flowering and stem elongation under non-inductive photoperiodic conditions. None of the substances had an inhibitory effect on photoperiodically pre-induced plants. While gibberellin of appropriate concentrations was able to induce stem elongation in all plants and increased shoot lengthening in a concentration-dependent manner, flowering was only induced up to a rate of 60 °/o. The finding that flowering without stem elongation can be induced even at low concentrations indicates that gibberel-lin-mediated flowering is independent of and not obligatorily caused by stem elongation.
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