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When single leaves attached at a given node were allowed to carry on photosynthesis in (14)CO(2) for 30 min, younger plants showed a higher proportion of upward translocation than did older plants. Downward translocation of (14)C-photosynthate was stimulated by ATP pre-treatment of the translocating leaf, while upward translocation was not affected by ATP. A similar phenomenon was observed in the translocation of (14)C-sucrose infiltrated into a leaf with or without ATP. Downward translocation of photosynthate was inhibited by DNP pre-treatment of a fed leaf. Upward translocation, however, was not affected by DNP. Thirty min after infiltration of (14)C-glucose into a leaf, almost all the (14)C translocated upwards was found to be in the form of glucose, while a great part of the (14)C translocated downwards was in the form of sucrose. In the case of translocation of infiltrated (14)C-sucrose, (14)C found both above and below the fed leaf was mainly in the form of sucrose.

Comparison of Upward and Downward Translocation of 14C From a Single Leaf of Sunflower

Comparison of Upward and Downward Translocation of ¹⁴C From a Single Leaf of Sunflower