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- W2029367943 abstract "A B S T R A C T The normal supply of growth substances to a young soybean plant was altered by removing the plant's apical meristem and replacing this meristem with an aqueous solution of either indole-3acetic acid (IAA), gibberellic acid (GA), or water. The length of each experiment was 1 hr. In the middle of it, '4CO2 was administered to one of the primary leaves of the plant, and at the end distribution of 14C in various parts of the plant was determined. It was found that an addition of growth substances stimulated in three different ways. Both IAA and GA increased the total amounts of sucrose-'4C translocated, increased the rate of its translocation, and affected the distrlbution pattern of translocated sucrose throughout the plant. Experiments using IAA-'4C have shown that the action of IAA is on the longitudinal in the stem and not on the transfer of photosynthate from the mesophyll to the conducting tissues of the leaf. THERE ARE several suggestions in the literature that of organic materials in plants may be under the influence of growth regulators. For example, De Stigter (1961) showed in his grafting experiment that some translocation factor generated in a Cucurbita scion leaf was necessary for the of materials across the graft union of Cucurbita-melon down to the roots. An effect of hormones on has also been suggested by Zimmermann (1958). In his studies on white ash (Fraxinus americana) this worker found that after defoliation of the tree the removal of sucrose from phloem decreased and suggested that this might be controlled by a hormone originating in the leaf. Alvim (1960) found that a bean plant sprayed with gibberellic acid showed an increase in the dry weight of its stem and suggested that this might be due to a greater of materials from the leaves to the stem. Although it seems possible that of materials in a plant is under the control of hormones, the direct evidence for this is lacking. The present work describes a model system set up to study whether of organic materials in a higher plant is under the influence of plant hormones. Such a model system involves the removal of the apical meristem which normally supplies hormone, and the replacement of this meristem with a solution of either indole-3-acetic acid (IAA), gibberellic acid (GA), or water as control. The effects of these growth regulators on the of photosynthate from a primary leaf to the rest of the plant were assessed in three ways. First, the total amount of photosynthetically assimilated 14C exported from such a leaf was" @default.
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- W2029367943 date "1967-02-01" @default.
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- W2029367943 title "HORMONAL CONTROL OF TRANSLOCATION OF PHOTOSYNTHETICALLY ASSIMILATED 14 C IN YOUNG SOYBEAN PLANTS" @default.
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- W2029367943 doi "https://doi.org/10.1002/j.1537-2197.1967.tb06917.x" @default.
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