Carnation (Dianthus caryophyllus L., cv. White Sim) buds and flowers were exposed to various ethylene concn for different periods and at different temp. A dosage term, ppb-hr, was used to evaluate C2H4 concn and exposure time. Keeping life was highly correlated with dosage, depending upon temp. Buds were less susceptible than flowers to C2H4 injury at all temp, with no significant loss of keeping life at the highest dosages and a temp of 1.7°C. Open flowers exhibited zero keeping life with 47,000 ppb-hr at the same temp. At 21.1°C, zero keeping life was obtained with mature flowers at 4,400 ppb-hr, whereas buds required 8,400 ppb-hr. Mathematical relationships showed the effect of increasing C2H4 dosages on rate of keeping loss to be linear. Over a dosage range of 103 to 105 ppb-hr, the effect of temp on open flowers was linear, and slightly curvilinear on buds. Increasing exposure temp from 1.7 to 21.1°C increased the effect of ethylene nearly 1,000 times on open flowers.
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