Combined Treatment of 8-Hydroxyquinoline and Glucose on Cut Hydrangea Flowers

The optimum application of cut flower preservative treatments on fresh-stage and antique-stage cut hydrangea flowers was investigated. The vase lives of fresh-stage cut flowers maintained in deionized water (control), in solutions containing 100 mg L⁻¹ or 200 mg L⁻¹ 8-hydroxyquinoline sulfate (8-HQS), and in a solution containing silver thiosulfate complex (STS) were compared using a hydrangea cultivar ‘Endless Summer’. The mean vase life of flowers with 100 mg L⁻¹ 8-HQS treatment was significantly longer than that for the control. However, other treatments did not exhibit significant difference from the control. The solutions containing 100 mg L⁻¹ or 200 mg L⁻¹ 8-HQS were supplemented with 1% and/or 2% glucose, and the fresh-stage cut flowers of ‘Endless Summer’ were maintained in these prepared solutions. The mean vase life of flowers treated with 100 mg L⁻¹ 8-HQS plus 1% glucose treatment was significantly longer than that for flowers under the control 100 mg L⁻¹ 8-HQS treatment. The mean vase life of treatment with 200 mg L⁻¹ 8-HQS with 1% glucose was significantly longer than for the control 200 mg L⁻¹ 8-HQS treatment. The mean vase life of flowers treated with 200 mg L⁻¹ 8-HQS with 2% glucose tended toward a longer vase life than that for the control. When the fresh-stage cut flowers of ‘Flambeau’, ‘Grünherz’, and ‘Miss Hepburn’ were maintained in a solution containing 100 mg L⁻¹ 8-HQS and 1% glucose, they exhibited significantly longer vase lives than those maintained in deionized water. In conclusion, a solution containing 100 mg L⁻¹ 8-HQS and 1% glucose could extend the vase life of fresh-stage cut hydrangea flowers of several cultivars.Article信州大学農学部AFC報告 18: 19-27(2020)departmental bulletin pape