Changes in Concentrations of Sugars and Organic Acids in the Long-Lasting Flower Clusters of Phalaenopsis

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概要

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• The explanation for the maintenance of the quality of flower clusters in Phalaenopsis for up to four weeks or more was determined. The concentration of sugars and organic acids and the daily course of CO_2 exchange in the florets, the flower stalk and the leaves of intact and cut flower clusters were determined. The concentration of sugars in florets of the cut flower clusters decreased progressively and linearly to 25% of the initial value. The concentration of organic acids in the flower stalk of the intact flower cluster increased progressivly, whereas the concentration of malic acid in the flower stalk of the cut cluster decreased. The levels of sugars and organic acids in leaves in the absence of a flower cluster was higher than those in leaves in the pressence of a cluster. The leaves and the flower cluster were related as source and sink organ, respectively. The level of sugars in the flower cluster remained high level for a long period of time. The results indicate that the stalk is capable of photosynthesis and has the characteristics of weak-CAM plants. The photosynthate produced by the stalk served to maintain the quality of the cut flower cluster for at least for 50 days and that of the intact flower cluster.

• 日本植物生理学会の論文

著者

• Ikusima Isao

  Marine Ecosystems Center Faculty Of Science Chiba University

• Endo Muneo

  Chiba Prefectural Agricultural Experimental Station

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