Abstract

The level of benzoic acid was measured in Lemna gibba G3 grown on M and E media under inductive and non-inductive daylengths. Benzoic acid was slightly higher in plants grown on M medium but there was no difference in the benzoic acid levels in flowering and vegetative plants. When L. gibba G3 was grown under continuous light on 1/10 M medium or 1/2 H medium there was virtually no flowering, but addition of benzoic acid to either medium led to a substantial flowering response. In both cases this flowering response was inhibited by the plant hormones IAA, GA3, ABA and zeatin, with IAA and GA3 being the least inhibitory and ABA being the most inhibitory. This same pattern of inhibition was seen when L. gibba G3 was grown on M medium under continuous light, conditions that lead to photoinduction of flowering. These results leave open the possibility that endogenous benzoic acid may interact with other factors to influence the flowering response in L. gibba G3.

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