Extending the flower vase life is very important in the floriculture industry. In present study, the effectiveness of chitosan and salicylic acid nanoparticles in delaying of the senescence of cut roses was evaluated. Experiments were performed in a completely randomize
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Extending the flower vase life is very important in the floriculture industry. In present study, the effectiveness of chitosan and salicylic acid nanoparticles in delaying of the senescence of cut roses was evaluated. Experiments were performed in a completely randomized design with 9 treatments in six repetitions, and the treatments were applied by petal spraying every three days. Chitosan nanoparticles with two concentrations (0.1 and 0.5 mg/L) and SA with two concentrations (0.1 and 0.3 mmol) on the postharvest quality of cut roses were tested during 15 days period (1, 4, 7, 11, 15 days after harvest). The maximum vase life (17.8 days) observed in flowers subjected to foliar spraying of 0.5 mg/liter of chitosan nanoparticles with 0.3 mM salicylic acid, while shortest flower longevity (13.5 days) obtained in untreated flowers. Also, the amount of relative water absorption of flowers and flavonoid content with significant increase were detected in 0.5 mg/L chitosan nanoparticles with 0.3 mM salicylic acid treatment. Treatments containing chitosan nanoparticles, especially the combined treatment of 0.5 mg/L of chitosan nanoparticles with 0.3 mM SA, reduced the amount of electrolyte leakage of the petals and increasing the vase life. moreover, the lowest activity of antioxidant enzymes including GPX, PPO, POD and hydrogen peroxide were observed in flowers sprayed with 0.5 mg/liter chitosan nanoparticles + 0.3 mM SA. Among chitosan nanoparticle treatments, the longest vase life was related to 0.5 mg/liter (15 days), which increased flowers vase life by 11% compared to the control. Between SA treatments, the concentration of 0.3 mM was the most effective with a 6% increase in flowers vase life comparing untreated flowers. Finally, the combined treatments of chitosan nanoparticles and SA beside improving postharvest quality of cut roses, caused a 31% increase in flower longevity comparing untreated flowers.
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