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Morphological Responses and Vase Life of Rosa hybrida cv. Dolcvita to Polyamines Spray in Hydroponic System

4 Abstract: Rose flower is one of the most important cut-flowers, with the highest world production rate. The main problem of rose flower is its short vase life. Polyamines are involved in a wide range of metabolic processes in plants. The aim of this study was to examine the effect of polyamines on vegetative and reproductive growth and vase life of rose plants (Rosa hybrida cv. Dolcvita) in soil-less cultures. The experiments were carried out in a randomized completely design with ten treatments and four replications. Treatments included: Putrescine at the rates of 0,1,2 and 3 mM, Spermidine at the rates of 0, 0.5,1 and 1.5 mM, Spermine at the rates of 0, 1,2 and 4 mM applied as foliar sprays on two months old of Rose plants cv Dolcvita. Data were analyzed using the MSTAT-C program by performing analysis of variance (ANOVA), followed by LSD Test at P = 0.05. Results showed that the effects of foliar application of polyamines on the length of flower stalks, flower stalks fresh weight; vase life, flower buds diameter and flower buds length were significant. The highest and lowest flower stalks length were obtained in nutrient solutions containing 1.5mM spermidine and in control with 100.66 and 71 cm respectively and the highest vase life was obtained in solutions containing 0.5mM spermidine and also in solutions containing 1mM spermine. The data obtained in this study suggested that polyamines have significant effects on rose properties and quality. Abbreviations: PAs-Polyamines. Put-Putrescine. Spd-Spd. Spm-Spermine. 1-amino-cyclopropane-l-carboxylic acid-ACC.