Ethylene-promoted malonylation of 1-aminocyclopropane-1-carboxylic acid participates in autoinhibition of ethylene synthesis in grapefruit flavedo discs |
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| Authors: | Y Liu N E Hoffman S F Yang |
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| Institution: | (1) Department of Vegetable Crops, University of California, 95616 Davis, CA, USA;(2) Present address: Shanghai Institute of Plant Physiology, Academia Sinica, 200032 Shanghai, People's Republic of China;(3) Present address: MSU-DOE Plant Research Laboratory, Michigan State University, 48824 East Lansing, MI, USA |
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| Abstract: | The increase in ethylene formation and in 1-aminocyclopropane-1-carboxylic acid (ACC) content in flavedo tissue of grapefruit (Citrus paradisi Macfad. cv. Ruby Red) in response to excision was markedly inhibited by exogenous ethylene. Ethylene treatment inhibited the synthesis of ACC, but increased the tissue's capability to malonylate ACC to N-malonyl-ACC, resulting in further reduction in the endogenous ACC content. The development of extractable ACC-malonyl-transferase activity in the tissue was markedly promoted by treatment with exogenous ethylene. These results indicate that the autoinhibition of ethylene production in this tissue results not only from suppression of ACC synthesis, but also from promotion of ACC malonylation; both processes reduce the availability of ACC for ethylene synthesis.Abbreviations ACC
1-Aminocyclopropane-1-carboxylic acid
- AVG
aminoethyoxyvinylglycine (2-amino-4-(2 -aminoexthoxy)-trans-3-butenoic acid)
- MACC
1-(malonylamino)-cyclopropane-1-carboxylic acid |
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| Keywords: | 1-Aminocyclopropane-1-carboxylic acid Ethylene synthesis (autoinhibition) N-malonyltransferase |
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