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To examine the possible involvement of polyamines on the postharvest longevity of cut rose, the endogenous polyamine levels, ethylene production, the effect of polyamine on the postharvest longevity and the change of S-adenosylmethionine decarboxylase (SAMDC) were analyzed in the cut rose flowers and leaves. Putrescine was the major product among analyzed polyamines in flowers and leaves in two different cut rose cultivars, ‘Cardinal’ and ‘Vital’, and rapidly decreased in 3 days. The exogenous spermine among polyamines (putrescine, spermidine, and spermine) could effectively induce the postharvest longevity of the cut roses. In addition, the incubation of the cut flower with water increased both SAMDC activity and spermine content by 2 times, which were followed by ethylene production. The exogenous polyamines suppressed ethylene production or delayed the onset of the ethylene production. These results provide evidence that spermine may be able to increase the longevity of cut rose. Additionally, the increase of the endogenous spermine with water results from enhancing SAMDC activity. Further, we discuss that the increase of spermine content and SAMDC activity may play role as a resistance mechanism against fungal and bacterial infection and the development of transgenic rose overexpressing SAMDC may be a useful tool to improve the current rose cultivars for the commercial usage.

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Abstract
Introduction
Materials and Methods
Results
Discussion
Acknowledgments
Literature Cited

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UCI(KEPA) : I410-ECN-0101-2009-525-016907621