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Carbohydrate production and partitioning were examined under different photoperiods in chrysanthemum (Dendranthema grandiflorum cv. Envy). Sucrose was the principal sugar at the shoot tips of chrysanthemum analyzed under inductive 10 h photoperiods. Fructose and glucose were only present in smaller quantities compared to sucrose. Sucrose content at the shoot tip increased more than 1.5-fold within a day in 10 and 13 h short photoperiods and remained static for 9 days compared to vegetative plants in 16 h photoperiods. Growth parameters such as total dry weight, leaf area, absolute growth rate, and final leaf number increased as photoperiods extended from 10 to 16 h, whereas floral development and partitioning of carbohydrate to floral parts measured by flower weight ratio were highest under 10 h photoperiods. Net assimilation rate was highest at 10 h photoperiods followed by 16 and 13 h photoperiods, indicating higher productivity of source leaves at 10 h photoperiods than of 13 or 16 h photoperiods.

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Abstract
Introduction
Materials and Methods
Results
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UCI(KEPA) : I410-ECN-0101-2009-525-016909009