Changes in carbohydrate content in cut chrysanthemum [Dendranthema X grandiflorum (Ramat.) Kitamura] 'Shuho-no-chikara' stems kept at different temperatures during anthesis and senescence.

摘要

Changes in carbohydrate content in capitulum, upper stems, middle stems, lower stems, upper leaves, and middle leaves in cut chrysanthemum stalks placed in vases at 20, 25 and 30deg C were investigated for 3 weeks. The capitula showed no apparent senescence symptoms within 3 weeks at 20deg C and 25deg C, but senesced rapidly at 30deg C. The leaves wilted earlier than did the capitula. Fructans were found in all plant parts, but particularly in the stems. During capitulum development, fructan content in the upper and middle stems rapidly declined to a low level which suggested that fructans in these stems were utilized for capitulum development. After anthesis, leaves and stems seemed to serve as a carbohydrate source, but whether the quantity of carbohydratesin the leaves and stems is related to the longevity of cut chrysanthemums could not be elucidated.