1.Flower Research Institute/National Engineering Research Center for Ornamental Horticulture,Yunnan Academy of Agricultural Sciences,Kunming 650205,China
2.Kunming Haida New Flower Border and Seedlings Co. ,Ltd. ,Anning 650300,China
To explore the effects of different harvest periods and preservatives on the vase performance of cut branches of Rhododendron, in this experiment, the cut branches of Rhododendron XXL were used as the experimental material, and the changes in flower and inflorescence size, the flowering rate, and the vase life of the cut branches were studied at the different harvest period such as the tight-bud stage, the unfold-top stage, the soft-bud stage, and the unfold-petal stage in order to determine the optimal harvest period. And then the effects of different preservatives on the flowering characteristics, the water balance, and the fresh weight change rate of XXL cut branches were studied by using sucrose, 8-hydroxyquinoline citrate(8-HQC), and citric acid monohydrate(CA) as the reagents. The results showed that the XXL cut branches harvested at the unfold-petal stage had the best vase performance with the largest flower and the longest vase life. And the cut branches harvested at the soft-bud stage had the second vase performance. Among the four different preservatives used in this experiment, the cut branches of the treatment of 4.50 g/L of sucrose+150 mg/L of 8-HQC+100 mg/L of CA had high flowering rate and large inflorescence, and the treatment effectively maintained the water balance, and delayed the decrease in fresh weight, and extended the vase life to 18±1 days of the cut branches. In conclusion, the rhododendron cut branches could be carried out according to the distance of consumption, by cutting the branches at the soft-bud stage for the far distance and the branches at the unfold-petal stage for the close distance, at the same time, 4.50 g/L of sucrose+150 mg/L of 8-HQC+100 mg/L of CA could be selected as the preservatives to prolong the vase life.
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