To evaluate the effect of nanosilver (5, 10 and 20 mg l-1), hydrogen peroxide (200, 400 and 600 µM) and Nanosil(200, 400 and 600 µM) as antimicrobial compounds in vase solution of cut rose cv. ‘Grand Press Angela’ flowers, an experiment with 10 treatments and 3 replications was conducted in a completely randomized design. Cut rose flowers were continuously treated with these compounds. The results indicated a significant and positive impact of Nanosil on the measured traits. The highest vase life (13.16 days), maximum solution uptake (0.943 ml g-1 F.W.), the lowest fresh weight loss (6.31 g), the lowest bacterial population in stem end (87.67 Log10 CFU ml-1) and the highest petals carotenoid (17.61 µg g-1 F.W.) were related to the 400 µM Nanosil treatment. Most POD enzyme activities were recorded for the treatment of nanosilver 5 mg l-1 (3.94 nmol g-1 F.W.) and 400 µM Nanosil (3.86 nmol g-1 F.W.). Different concentrations of nanosilver were not successful in keeping vase life and its related traits because of the continuous use of these compounds. Different concentrations of hydrogen peroxide of evaluated characteristics were superior to the control. Overall, treatment with 400 µM Nanosil is recommended as an effective treatment for long-term preservation of cut flowers of roses as it was the best treatment and also had the longest vase life. پرونده مقاله