ISHS Acta Horticulturae 405: VI International Symposium on Postharvest Physiology of Ornamental Plants
INHIBITION OF ETHYLENE-INDUCED CELLULAR SENESCENCE SYMPTOMS BY 1-METHYLCYCLOPROPENE. |
| Authors: | M. Serek, E.C. Sisler, G. Tamari, A. Borochov |
| Keywords: | Ethylene, leakage, lipid fluidity, 1-methylcyclopropene (1-MCP), Petunia hybrida, senescence |
| Abstract:
Ethylene is known to accelerate flower senescence, but the sequence of events that links its interaction with the tissue and the final senescence symptoms is still obscure. Recently, 1-methylcyclopropene (1-MCP) was found to inhibit ethylene-induced wilting in flowers. This work was carried out in order to investigate the effects of 1- MCP on cellular senescence symptoms in petunia flowers following expossure to ethylene. Cut petunia (Petunia hybrida) flowers that were exposed to ethylene for 12 h at concentrations of 1–12 ppm wilted sooner than their untreated counterparts. This effect was abolished by a 6-h pre-treatment with 1-MCP. Immediately following the ethylene treatment, decreases in petal fresh weight and total protein content were measured, along with higher electrolyte leakage, and lower membrane lipid fluidity and protein content. When applied alone, 1-MCP had relatively little impact on these parameters. However, when the flowers were treated with 1-MCP prior to the ethylene treatment, ethylene had no effect. These results indicate that while ethylene effects on wilting were obvious three days after the treatment, cellular parameters were affected already at the end of the treatment. Since 1-MCP repressed these early ethylene effects, it was concluded that it interacts with ethylene action in petunia flowers in a rather early stage, long before apparent wilting. | |
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