تاثير تيمارهاي متيل جاسمونات، نانو نقره و نانو كلسيم بر افزايش عمر گل جاي گل رز شاخه بريدني رقم هاي سامورايي و آوالانچ

The Rose flower, as one of the most important ornamental plants in the world, have a significant share in the cut flower market. However, their short post-harvest life is one of the main challenges in the storage an‎d distribution of this product. On the other han‎d, the difference in response between the two cultivars Samurai an‎d Avalanche in terms of vase life indicates the importance of genetic characteristics in responding to post-harvest treatments. This study aimed to investigate the post-harvest effects of methyl jasmonate, silver nanoparticles, an‎d commercial Floriva solution (a combination of nanosilver an‎d nanocalcium) on the flower vase life of two rose cultivars Samurai an‎d Avalanche. The present study was conducted in the greenhouse laboratory of Isfahan University of Technology as a factorial experiment in a completely ran‎domized basic design with three replications an‎d each replication including 3 plants. After harvesting the flowers, methyl jasmonate treatment at two levels of 250 an‎d 500 micromolar, commercial solution of Floriva 0.2% (a combination of nanosilver an‎d nanocalcium particles), an‎d nanosilver at concentrations of 20 an‎d 40 mg/L were applied, all as continuous treatments an‎d control (500 ml of distilled water). . In the time interval of 0, 2, 4, 6, 8, 10, 12 an‎d 14 days, the characteristics of vase life, water relations, flower diameter, relative fresh weight, relative water content, ion leakage, total protein, malondialdehyde level an‎d the activities of catalase, guaiacol peroxidase an‎d ascorbate peroxidase enzymes were measured. The results of this study showed that Floriva treatment, by maintaining water flow in flower tissues through controlling microbial growth an‎d increasing cell wall strength by reducing ion leakage, was able to increase vase life by about 3.4 days compared to the control. Also, the use of nanosilver treatment with a concentration of 40 mg/L increased vase life by 2.7 days compared to the control treatment, while the lowest vase life was recorded for the control treatment. Avalanche cultivar, with higher relative water content an‎d relative fresh weight percentage, an‎d lower malondialdehyde an‎d ion leakage, showed a 2.3-day longer flower life than Samurai cultivar. In addition, 250 μM methyl jasmonate treatment in Samurai cultivar an‎d 40 mg/L nanosilver treatment in Avalanche cultivar maintained the highest water balance. Improved water flow in Avalanche cultivar also increased the relative diameter of flowers compared to Samurai cultivar. Total protein content in Avalanche cultivar was higher than Samurai cultivar, but the applied treatments did not have a significant effect on protein levels. Also, the activity of antioxidant enzymes in the Samurai cultivar was higher than that of the Avalanche cultivar, an‎d overall, the treatments of methyl jasmonate 250 μM, nanosilver 40 mg/L, an‎d Floriva treatment showed the greatest positive effect in increasing these physiological indicators.

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مهديه غلامي , پرويز احسان زاده