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Is acetaldehyde the causal agent in the retardation of carnation flower senescence by ethanol?

Podd, L. A.; Staden, J. van;

Journal of Plant Physiology Year: 1999 Vol: 154 Issue: 3 Pages: 351-354 Ref: 11 ref.

1999

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Is acetaldehyde the causal agent in the retardation of carnation flower senescence by ethanol?

 

A 3% ethanol holding solution inhibited the conversion of ACC to ethylene and doubled the vase life of cut carnation (cv. White Sim) flowers. Although the most effective concentration varied, high concentrations of ethanol had negative effects. The most pronounced of these was the death of the ovary. Ethanol levels were much higher in the ovaries of treated flowers than in those of control flowers. A large amount of acetaldehyde was detected in the ovaries of treated flowers. Acetaldehyde was also detected in all other floral organs tested. Acetaldehyde was present in the head-space surrounding ethanol-treated flowers, but not control flowers. This indicates that some of the ethanol applied as a postharvest treatment was broken down to acetaldehyde within the plant tissue and released into the micro-atmosphere by the flower. If the conversion of ethanol to acetaldehyde was impeded using an inhibitor of alcohol dehydrogenase, 4-methyl pyrazole, ethanol was no longer effective. Acetaldehyde (1 or

3 %) as a holding solution gave similar results to a 3% ethanol holding solution. It appears that acetaldehyde, produced from ethanol, is the causal agent for the retardation of carnation flower senescence.