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Plant Physiology 88:833-837 (1988)
© 1988 American Society of Plant Biologists

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Metabolism and Enzymology

Inhibition of Ethylene Biosynthesis by Salicylic Acid

Charles A. Leslie1 and Roger J. Romani

Department of Pomology, University of California, Davis, California 95616

Salicylic acid inhibited ethylene formation from ACC in self-buffered (pH 3.8) pear (Pyrus communis) cell suspension cultures with a K1app of about 10 micromolar after 1 to 3 hours incubation. Inhibition appeared noncompetitive. Among 22 related phenolic compounds tested, only acetylsalicylic acid showed similar levels of inhibition. Inhibition by salicylic acid was inversely dependent on the pH of the culture medium and did not require a continuous external supply of salicylate. When compared to known inhibitors of the ethylene forming enzyme, cobalt, n-propyl gallate, and dinitrophenol, inhibition by salicylic acid most closely resembled that by dinitrophenol but salicylic acid did not produce the same degree of respiratory stimulation. Results are discussed in terms of other known effects of salicylic acid on plants, pH-dependency, and the possible influence of salicylic acid on electron transport.

1 C. A. L. received partial support from the University of California, Davis, Postharvest Biology Fellowship.




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