Selective translocation of products of photosynthesis in soybean

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Abstract
The translocation of Cl4-labelled products of 10 min photosynthesis by primary leaves of soybean plants depended on the conditions of growth. The radioactive sucrose and serine recovered in the stem under adequate nutrition in the growth cabinet were replaced by sucrose alone under N deficiency and by malic acid under greenhouse conditions. Increasing the total CO2 assimilated had little effect on the products of assimilation and no direct effect on translocation. Metabolic conversion of sucrose in the stem was shown to be too slow to account for the serine and malic acid recovered. When serine and sucrose were translocated together, their proportions in the stem were not directly related to their proportions in the leaf. It is concluded that translocation of the products of assimilation by soybean is selective and that the normal translocation pattern of sucrose and serine may be altered or replaced under suitable conditions.