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Plant and Cell Physiology, 1985, Vol. 26, No. 4 655-659
© 1985

Article

The Role of Benzoic Acid and Plant Hormones in Flowering of Lemna gibba G3

Shozo Fujioka1, Isomaro Yamaguchi2, Noboru Murofushi2, Nobutaka Takahashi1,2, Sumiko Kaihara3, Atsushi Takimoto3 and Charles F. Cleland4

1 The Institute of Physical and Chemical Research Wako, Saitama 351-01, Japan
2 Department of Agricultural Chemistry, The University of Tokyo Bunkyo-ku, Tokyo 113, Japan
3 Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University Kyoto 606, Japan
4 Smithsonian Environmental Research Center 12441 Parklawn Drive, Rockville, Maryland 20852-1773, U.S.A.

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.

(Received November 13, 1984; Accepted February 27, 1985)
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