Article | . 2019 Vol. 37, Issue. 2
Chlorine Dioxide Treatments Extend the Vase Life of Exported Cut Roses

Department of Environmental Horticulture, University of Seoul1
Natural Science Research Institute, University of Seoul2

2019.. 238:245


This study investigated the effect of applying chlorine dioxide (ClO2) on the vase life of exported cut roses. The roses (Rosa hybrida L. ‘Beast’) were treated in a holding solution (HS) treatment of tap water (TW, control), distilled water (DW), 2% sucrose, 4 μL∙L-1 ClO2, 4 μL∙L-1 ClO2 + 2% sucrose, 200 μL∙L-1 8-hydroxyquinoline-5-sulfoonic acid (8-HQS) + 2% sucrose, and a pulsing solution (PS) treatment of 50 μL∙L-1 ClO2 for 10 seconds. An HS of 4 μL∙L-1 ClO2 or 4 μL∙L-1 ClO2 + 2% sucrose and PS of 50 μL∙L-1 ClO2 extended vase life 0.3 to 2.6 days more than the control (TW and DW), and the effect was greatest in PS. Initial weight was maintained until day 6 after treatment in an HS of 8-HQS + sucrose and sucrose, and day 8 after treatment in an HS of TW, DW, a PS of 50 μL∙L-1 ClO2, and a PS of 50 μL∙L-1 ClO2 + an HS of 4 μL∙L-1 ClO2 with sucrose, and day 10 after treatment in HS of 4 μL∙L-1 ClO2 and ClO2 + sucrose. Vase solution uptake was higher in a PS and HS of ClO2 than in sucrose and 8-HQS, respectively, 6 days after treatment. Bacteria in the vase solution without stems were detected continuously in the HS of TW, DW, and sucrose at 1.4 × 104, 3.8 × 104, and 1.4 ×105 CFU/L, but not in the HS of ClO2, ClO2 + sucrose, and 8-HQS + sucrose 6 days after treatment. Bacteria in the vase solution with stems were detected in TW, DW, and sucrose at levels of 8.0×104, 1.4×105, and 6.8×105 CFU/L, respectively, 6 days after treatment, but the sterilization effect of ClO2, ClO2 + sucrose, and 8-HQS + sucrose continued until 8 days after treatment. Treatment with an HS of 4 μL∙L-1 ClO2 + 2% sucrose or a PS of 50 μL∙L-1 ClO2 for 10 seconds in an export container was simulated in the laboratory for 2 days to a cooperative sorting facility from a rose greenhouse and then for 4 days to an auction market in Japan from a cooperative sorting facility in Korea. The vase life of roses in HS + HS, HS + TW, PS + TW, PS + PS, and TW + HS was 18.7, 18.0, 17.7, 17.2, and 14.3 days, respectively. The relative fresh weight was the lowest in the TW + HS at 2 days after treatment. Therefore, for the export process of cut roses, HS of ClO2 + sucrose and PS of ClO2 were effective for 2 days after harvest, and HS + HS maintained both the sterilization effect in the vase solution and a high relative fresh weight.

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