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Plant Physiology 69:687-690 (1982)
© 1982 American Society of Plant Biologists

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Articles

Autoinhibition of Ethylene Production in Citrus Peel Discs 1

SUPPRESSION OF 1-AMINOCYCLOPROPANE-1-CARBOXYLIC ACID SYNTHESIS

Joseph Riov2 and Shang Fa Yang

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

Wound ethylene formation induced in flavede tissue of citrus fruit (Citrus paradisi MacFad. cv. Ruby Red) by slicing was almost completely inhibited by exogenous ethylene. The inhibition lasted for at least 6 hours after removal of exogenous ethylene and was then gradually relieved. The extent of inhibition was dependent upon the concentration of ethylene (1 to 10 microliters/liter) and the duration of treatment. The increase in wound ethylene production in control discs was paralleled by an increase in 1-aminocyclopropane-1-carboxylic acid (AAC) content, whereas in ethylene-treated discs there was little increase in ACC content. Application of ACC completely restored ethylene production in ethylene-pretreated discs, indicating that the conversion of ACC to ethylene is not impaired by the presence of ethylene. Thus, autoinhibition of ethylene synthesis was exerted by reducing the availability of ACC. Ethylene treatment resulted in a decrease in extractable ACC synthase activity, but this decrease was too small to account for the marked inhibition of ACC formation. The data indicate that autoinhibition of ethylene production in citrus flavede discs results from suppression of ACC formation through repression of the synthesis of ACC synthase and inhibition of its activity.

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 81-14933) and United States-Israel Agricultural Research and Development Fund (I-145-79).




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Regulation by Carbon Dioxide of Wound-induced Ethylene Biosynthesis in the Peel of Citrus Fruit
Food Science and Technology International, December 1, 2007; 13(6): 497 - 504.
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Involvement of ethylene biosynthesis and perception in the susceptibility of citrus fruits to Penicillium digitatum infection and the accumulation of defence-related mRNAs
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Copyright © 1982 by the American Society of Plant Biologists