Evaluation some qualitative and quantitative characteristics of Rosa flowers cv. black magic with pre harvest Spray of Citric acid and Malice acid

The length of vase life is on of the most imoirtant factors foe quality of cut flowers. In the world many attempts have been taken to increase the vase-life of cut flowers by using different methods and materials. In this research, the effect of applying citric acid and malic acid each on with 3 concentration 2, 4 and 6 mM at preharvest stage on vase-life of rose was investigated. The factorial experiment was carried out as a randomized complete blocks design with 7 treatment and 3 replications. Durind the experiment traits such as relative fresh weight, height of plant, anthocyanins levels in petals, total chlorophyll of leaf, protein, activity of PAL and SOD enzyme and flower longevity on plant were evaluated. The results showed that usage of malic acid and citric acid cause improvement in traits of evaluated vs. control and The best results in all of the parameters observed in malic acid (6 mM).