جستجوی مقالات مرتبط با کلیدواژه « rosa » در نشریات گروه « زیست شناسی »

Damask rose (Rosa × damascena) is one of the most significant species of Rosaceae family scattered in mountain regions of Iran from west lands to central and eastern hills of the country. R. × damascena has considerable applications in pharmaceuticals and perfumeries and has been the subject of vast research. Extensive studies on genotypes of R. × damascena in Iran have shown considerable diversity in this species, and this could represent Iran as a potential hub for genetic diversification and improvement of its cultivars. The species seems to be the most important direct ancestor of North West cultivars in Europe in sect. Rosa, genus Rosa which is thought to be a hybrid with three parents of wild Rosa species, and R. moschata species is its Asian female parent. Based on the evidence from fossils of the genus Rosa, it has been suggested that Asia is the ancestral area for Rosa genus, and the Synstylae lineage in Europe is probably the oldest group that has expanded from Asia about 30 million years ago. The phylogeny of this difficult genus shows presentation of an evolutionary framework requires more in-depth studies.

In order to investigate the postharvest effect of sodium nitroprusside on vase life of cut rose, Utopia and Dolce Vita cultivars, an experiment was conducted as factorial in a completely randomized design with three factors and six replications. The first factor was included two cultivars of cut flowers of rose.  The second factor was four concentrations of sodium nitroprusside 0 (control) 20, 40 and 60 μM, which was applied by pulse treatment. The third factor was the time of application at 24 and 48 hours. The results of this research showed that sodium nitroprusside treatment had a significant effect on vase life, catalase activity, ion leakage and flower diameter at 1% probability level and for fresh and dry weight of flower and stem, Ascorbate peroxidase activity and water absorption rate had a significant effect at 5% probability level. The highest vase life of Utopia cultivar was in 40 μM sodium nitroprusside in 48 hours and in Dolce Vita, it was related to sodium nitroprusside concentration of 60 μM in 48 hours. The most antioxidant enzymes activity such as catalase and ascorbate peroxidase were obtained at concentrations of 40 and 60 μM sodium nitroprusside. In general, the results of this study showed that in Utopia using 40 μM sodium nitroprusside for 48 hours and in Dolce Vita 60 μM sodium nitroprusside for 48 hours were the best treatments that could improve the traits studied.

This study for Effect of EC Irrigation Water on Quality and Quantity of Rosa cv. Dolce Vita in Hydroponic Culture, in a completely randomized design experiment with 4 treatments, 3 replication, were conducted. Pot without irrigation with sodium chloride was used as control. To perform the experiment, cuttings of roses were prepared and cultured in 5-kg pots containing 70% cocopeat and 30% perlite. Irrigation was carried out twice a day at the beginning of the experiment with saline water and after the third day irrigation was done by applying salinity treatments in all treatments equally (with equal volume ratio). Quantitative and qualitative traits of plant such as fresh and dry weight of shoot, flower number, bud diameter, stem diameter, petal length, anthocyanin of petals, total chlorophyll of leaf, potassium and calcium content and longevity of rose on plant were evaluated. The results showed that application of all salinity levels due to sodium chloride salt reduced all evaluated traits compared to control. Also, analysis of variance table showed that the effect of treatment on all traits was statistically significant at 1% level and there was a positive and significant correlation between all traits at 1 and 5% level