Article ID: UTD-268
Many cut flowers are treated with an ethylene action inhibitor, silver thiosulfate (STS), to delay senescence and are shipped by dry transport that involves relatively easy loading. In addition, cut flowers are often treated with a mixture of sugar and germicide to improve their vase lives. Exogenous treatments of these compounds or drying by transport are thought to have various effects on cut flowers. This study investigated the effects of these post-harvest management methods on the scent emission of carnation (Dianthus caryophyllus L.) cut flowers. Under all the management conditions, the total scent emissions of cut flowers were highest on harvest days and then decreased, but major changes in their compositions were not observed. The decreases in scent emissions were thought to occur earlier than the known ethylene induction in carnation cut flowers, which is equivalent to the 4th day after harvest. The STS treatment had no effect on the scent emissions for some time after harvest, but suppressed the decreases in scent emission 4–8 days after harvest under the wet transport condition. It is likely that the decreases in scent emissions in carnation cut flowers occur in an ethylene-independent manner, but ethylene induction a few days after harvest further promotes decreases under wet transport conditions. STS may have suppressed the promotion of decreases due to ethylene. On the other hand, the treatment that assumed dry transport for one day dramatically promoted the decreases in scent emissions. Since the promoting effects were not affected by the STS treatment, they were considered to be ethylene-independent. A common sugar treatment with 1% glucose, sucrose, or fructose did not affect the scent emissions in the cut flowers. An isothiazolinonic germicide, which is a common cut flower germicide, did not affect the treatment. Considering the current post-harvest process, the duration of a noticeable scent in carnation cut flowers can be expected to be extended by adopting wet transport instead of dry transport.