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Plant and Cell Physiology, 1970, Vol. 11, No. 3 367-375
© 1970

Article

The translocation of photosynthetic products from mesophyll into midrib in tobacco plant III. The transformation of translocated 14C-sugars in the veins1

TOMOHIDE YAMAMOTO, SETSUKO SEKIGUCHI and MASAO NOGUCHI

Central Research Institute, Japan Monopoly Corporation Nishishinagawa, Shinagawa-ku, Tokyo, Japan

14C-U-sugars were introduced into tobacco plants through the mesophyll, the veins of the first order of branching, and the midrib, and 14C-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 14C-sugar introductions.

1) When 14C-U-sucrose was introduced into the leaf, no matter what the means of feeding was, most of the 14C which translocated basipetally in the veins and the midrib was found in the form of sucrose.

2) When 14C-U-glucose or 14C-U-fructose was administered to the leaf dirough the cut vein of the first order of branching, most of the 14C which translocated basipetally in the veins and the midrib was found in the form of sucrose.

3) 14C-U-glucose or 14C-U-fructose 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 14C-sucrose in the midrib attained 9–22% of the 80% ethanol-soluble 14C in the midrib.

4) When 14C-U-glucose or 14C-U-fructose was supplied to the mesophyll, the radioactivities 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 14C-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 stem.

1A part of this paper was presented at the Crop Science Society of Japan, in April, 1969

(Received December 8, 1969; )
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