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The effect of exogenous polyamines on the production of ethylene and the senescence of the detached petals of carnation (Dianthus caryophyllus L., cv. Desio) were studied. There was great variability between treatments in the timing, the extent, and the pattern of ethylene production. Instead of a single peak, some petals had small peaks which were separated by intervals of several days. Polyamines inhibited the production of ethylene and delayed the time of ethylene production in which a high concentration (10 mM) of polyamines worked more effectively. In the control, the production of ethylene peaked 3 days after treatment. On the other hand, each of 10 mM of putrescine, spennidine, and spermine completely inhibited ethylene production until days 13. In addition, 10 mM of putrescine, spermidine, and spermine delayed the time of petal inrolling until days 8 and then senescence. However, others concentrations (1 mM, 0.1 mM) in senescence showed the similarity with that of control. It was speculated that polyamines might influence to the integrity of cell membrane because they delayed the senescence and reduced the change of fresh weight of petals.
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