Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 54:904-906 (1974)
© 1974 American Society of Plant Biologists

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Articles

Identification of the Flower-inducing Factor Isolated from Aphid Honeydew as being Salicylic Acid 1

Charles F. Cleland2 and Alfred Ajami3

a Biological Laboratories, Harvard University, Cambridge, Massachusetts 02138

Honeydew produced by the aphid Dactynotus ambrosiae when feeding on flowering or vegetative plants of the short day plant Xanthium strumarium contains an active substance capable of inducing flowering in the long day plant Lemna gibba G3. In the present study, this active material has been identified as salicylic acid through the use of gas-liquid chromatography and mass, infrared, and ultraviolet spectrometry. Authentic salicylic acid induces flowering in L. gibba G3 under strict short day conditions with an optimal response at about 5.6 µM. The possible significance of salicylic acid for the control of flowering in Xanthium or L. gibba G3 is discussed.

2 Present address: Department of Botany, University of North Carolina, Chapel Hill, N.C. 27514.

3 Present address: Eco-Control, Inc., 71 Rogers Street, Cambridge, Mass. 02142.

1 This research was supported in part by Grant GB 8686 and Grant GB 32895 from the National Science Foundation.




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Copyright © 1974 by the American Society of Plant Biologists