The mechanism involved in ethylene-enhanced ethylene synthesis in carnations
| Autor: | Shimon Mayak, Abraham H. Halevy, Wei Bo Jiang |
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| Rok vydání: | 1994 |
| Předmět: |
Ethylene
biology Physiology fungi food and beverages Plant physiology Ripening Plant Science Carnation Cycloheximide biology.organism_classification chemistry.chemical_compound chemistry Biochemistry biology.protein Plant hormone 1-aminocyclopropane-1-carboxylate synthase Climacteric Agronomy and Crop Science |
| Zdroj: | Plant Growth Regulation. 14:133-138 |
| ISSN: | 1573-5087 0167-6903 |
| Popis: | The plant hormone ethylene triggers and enhanced ethylene synthesis in certain ripening fruits and senescing flowers. Unlike most carnation (Dianthus caryophyllus L.) cultivars exhibiting climacteric rise in ethylene production at the onset of senescence, cv. Sandrosa does not show this phenomenon naturally. In order to understand the mechanism of autocatalytic ethylene production, we exposed carnation flowers cv. Sandrosa to ethylene which resulted in an enhanced capacity for ethylene synthesis in the petals. A short time response of one hour was measured for an increase in ACC oxidase activity, about five hours in advance of an increase in ACC synthase activity and ethylene production. The observed enhancement was dependent on the presence of exogeneous ethylene, and could be partially inhibited by prior treatment of the petals with α-amanitin or cycloheximide. The results of the present study suggest that in response to ethylene, activation of an existing enzyme is taking place first. This is followed by an increase in expression of ACC oxidase and ACC synthase mRNAs. |
| Databáze: | OpenAIRE |
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