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Plant Physiology 70:142-146 (1982)
© 1982 American Society of Plant Biologists

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Stimulation of Ethylene Production in Citrus Leaf Discs by Mannitol 1

Joseph Riov2 and Shang Fa Yang

Department of Vegetable Crops, University of California, Davis, California 95616

Wound ethylene formation induced in leaf tissue of citrus (Citrus sinensis [L.] Osbeck cv. "Washington Navel") by excision was significantly stimulated by mannitol after a lag period of about 6 hours. The extent of stimulation was dependent upon the concentration of mannitol (10 to 100 millimolar). This increased ethylene production was not simply due to osmotic effect or water stress as other osmoticums tested failed to exert such an effect. The stimulatory effect of mannitol resulted from both the enhancement of 1-aminocyclopropane-1-carboxylic acid (ACC) formation and the conversion of ACC to ethylene. The effect on the latter step was particularly pronounced in aged discs. The use of labeled mannitol showed that it was taken up by the leaf discs, utilized for respiration, and metabolized to sucrose, but no radioactivity was detected in the ethylene.

2 Permanent address: Department of Horticulture, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76-100, Israel.

1 Supported by research grants from the National Science Foundation (PCM 8114933) and United States-Israel Agricultural Research and Development Fund (I-145-79).






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Copyright © 1982 by the American Society of Plant Biologists