Studies on the metabolic process of photoassimilates and enhancement of sugar accumulation into fruit are important in fruit crop production. The metabolic process of the 14C-photoassimilates in cucumber plants was analyzed with respect to the vascular system. At 4 h after the start of 14CO2 feeding, the 14C-photoassimilates synthesized in a selected leaf on the main shoot were translocated to the vascular bundles of the internode just below the 14CO2-fed leaf. The radioactivity of 14C-stachyose was as high as that of 14C-sucrose in the vascular bundles of petiole and internode just below the 14CO2-fed leaf as well as in the midrib, while the radioactivity of 14C-stachyose was lower than that of 14C-sucrose in the mesophyll. The 14C-photoassimilates appeared to have been translocated without any metabolic change in the translocation pathways between the petiole and internode just below the 14CO2-fed leaf, because the ratio of 14C-stachyose radioactivity in the two parts was similar. At 8 h after the start of 14CO2 feeding, the 14C-photoassimilates were translocated to the fruit. In the vascular bundles of the peduncle, the ratios of the radioactivity of 14C-stachyose and 14C-raffinose were lower, and the ratio of the radioactivity of 14C-sucrose was higher, than that at the petiole and internode just below the 14CO2-fed leaf at 8 h after the start of 14CO2 feeding. Therefore, it seemed that 14C-stachyose and 14C-raffinose were hydrolyzed to 14C-sucrose in the peduncle.
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