Improvement of growth and flowering with the application of polyamines has been reported in various plants. Therefore, in this study, the foliar application of exogenous polyamines on quantitative traits, vase life, levels of endogenous growth regulators, and endogenous polyamines of roses was investigated. For this purpose, an experiment was conducted in a randomized complete block design with ten treatments, three replications, and two plants per replication in a commercial hydroponic greenhouse in Yasuj. The treatments included spraying the plants with putrescine at concentrations of 1, 2 and 3 mM, spermidine at concentrations of 0.5, 1 and 1.5 mM, spermine at concentrations of 1, 2 and 4 mM, and control (distilled water). The results showed that the highest and lowest branch height and weight were obtained in the 1.5 mM spermidine and control treatments, respectively. The use of polyamines increased the flower lifespan, with the highest flower lifespan of sixteen days being observed in plants treated with 1 mM spermine. The highest concentrations of indole acetic acid, gibberellic acid and zeatin were observed in the leaves of plants sprayed with 4 mM spermine. Also, the highest amount of abscisic acid was obtained in the leaves of plants sprayed with 1.5 mM spermidine. The use of exogenous polyamines increased the amount of putrescine and endogenous spermidine in the leaves. The overall results of this study showed that the use of spermidine at a concentration of 1.5 mM and exogenous spermine at 4 mM, due to the increase in the concentration of growth regulators and endogenous polyamines, improved the vegetative characteristics and increased the life of flowers of the rose cultivar Dolce Vita.
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