The translocation of photosynthetic products from mesophyll into midrib in tobacco plant III. The transformation of translocated ^<14>C-sugars in the veins

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^<14>C-U-sugars were introduced into tobacco plants through the mesophyll, the veins of the first order of branching, and the midrib, and ^<14>C-compounds in the veins and the midrib which translocated towards the base of the midrib were traced during the period of 120 min after the ^<14>C-sugar introductions. 1) When ^<14>C-U-sucrose was introduced into the leaf, no matter what the means of feeding was, most of the ^<14>C which translocated basipetally in the veins and the midrib was found in the form of sucrose. 2) When ^<14>C-U-glucose or ^<14>C-U-fructose was administered to the leaf through the cut vein of the first order of branching, most of the ^<14>C which translocated basipetally in the veins and the midrib was found in the form of sucrose. 3) ^<14>C-U-glucose or ^<14>C-U-fructosc injected into the vascular bundles of the midrib was translocated basipetally, as such, 10 and 30 min after injection; and at 30 min, the amount of the ^<14>C-sucrose in the midrib attained 9-22% of the 80% ethanol-soluble ^<14>C in the midrib. 4) When ^<14>C-U-glucose or ^<14>C-U-fructose was supplied to the mesophyll, the radio-activities of these hexoses were predominant in the first and second veins soon after application, then decreasing with a concomitant increase in the radioactivity of the ^<14>C-sucrose. From these results, it was inferred that in the veins of the first and second order of branching, glucose and fructose which moved from the mesophyll did not translocate as such, but were utilized for the synthesis of sucrose available for translocation via the midrib to the stemz.
日本植物生理学会の論文

The translocation of photosynthetic products from mesophyll into midrib in tobacco plant III. The transformation of translocated ^<14>C-sugars in the veins

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