Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 76:191-195 (1984)
© 1984 American Society of Plant Biologists

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Nonosmotic Inhibition by Sugars of the Ethylene-Forming Activity Associated with Microsomal Membranes from Carnation Petals 1

Shimon Mayak and Amihud Borochov

Department of Ornamental Horticulture, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, Israel

The activity of the membrane-bound ethylene-forming enzyme, previously reported in carnation (Dianthus caryophyllus L. cv White Sim) petals (Mayak, Legge, Thompson 1981 Planta 153: 49-55), is inhibited by sugars. Of the various sugars tested, sorbitol was the most effective and glucose the least. The effect of sugars was also evaluated on solubilized ethylene-forming enzyme activity, obtained by the use of 0.6% Nonidet NP-40 detergent. Similar to the membrane-bound activity, the solubilized activity was also inhibited. Kinetic studies revealed that the inhibition by sugars is reversible, and that inhibition by sucrose is uncompetitive while that by sorbitol is competitive. During senescence of petals, a decline in sugar content and climacteric like increase in ethylene occurs. Hence, the physiological relevance of sugar inhibition and its possible involvement in the regulation of ethylene biosynthesis is suggested.

1 Supported in part by funds granted by the Charles E. Revson Foundation. The statements made and the views expressed, however, are solely the responsibility of the authors.




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