Document Type: Original Article
Department of Horticultural Sciences, Faculty of Agriculture, University of Tabriz, Iran
Graduated MSc. Student, Department of Horticultural Sciences, Faculty of Agriculture, University of Tabriz, Iran
Department of Soil Sciences, Faculty of Agriculture, University of Tabriz, Iran
One of the main important factors in controlling quality of fresh flower crops is stem length because it is a major determinant of cut stem productivity. As the grading and marketing of most cut flowers like rose is generally based on stem length. The goal of this study was the evaluation of the effect of cut rose flower stem length on vase life and water balance of rose flower cv. ‘Bingo White’. This study was conducted as a factorial experiment on a Completely Randomized Design (CRD). Four different levels of cut stem length (25, 35, 45, and 55 cm) which put them in two levels (0 and 2%) of sucrose sodium hypochlorite solution 50 mg/L as preservative solutions with three replications for each treatment at 23 ± 2 °C with 65 ± 5% relative humidity and 12μmol/m2 s of light intensity (cool white fluorescent lamps) for 12 hours up to the end of vase life were used. Some of the qualitative and quantitative characteristics such as vase life, flower and leaf water potential, ion leakage, membrane stability index (MSI) and leaf stomatal conductance were evaluated in this experiment. The results showed that the highest vase life (17 days) was significantly (P≤0.01) observed at lowest stem length (25cm) and the lowest vase life (10 days) was related to highest stem length (55cm). The lowest rate of leaf and petal ion leakage was significantly (P≤0.05) observed in lowest stem length (25cm), however there was no significant difference among 35 and 45 lengths with 25 length. The lowest rate of leaf and petal membrane stability index also was significantly (P≤0.05) related to 55cm stem length, compared to other lengths. The highest rate of flower and leaf water potential was significantly (P≤0.01) related to 35cm stem length as compared with other treatments. Stomatal conductance decreased over time and was not affected significantly by stem length treatments. Generally, our results showed that the shorter cut stem length treatment (25cm) with the sucrose solution (2%) not only had the greatest effect on extending vase life but also it is improved the water status, decreased the ion leakage, and increased the flower membrane stability index.