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Photosynthate Partitioning in Soybean Leaves at Two Irradiance Levels

Comparative Responses of Acclimated and Unacclimated Leaves

United States Department of Agriculture, Science and Education Administration, Agricultural Research, Plant Physiology Institute, Light and Plant Growth Laboratory, Beltsville, Maryland 20705

High irradiance-acclimated soybean leaves had the same CO₂ exchange rates, but lower starch accumulation rates and correspondingly higher translocation rates than unacclimated leaves. Increased translocation rates were associated with increased sucrose phosphate synthetase (EC 2.4.1.14) activity. Foliar sucrose levels and adenosine diphosphate-glucose pyrophosphorylase (EC 2.7.7.9) activity were unaffected. Carbon assimilation, partitioning, and enzyme activity of unacclimated leaves were unaltered even after a second day's exposure to high irradiance. Results are consistent with the hypothesis that photosynthate partitioning between starch synthesis and sucrose translocation are controlled in part by the rate of sucrose synthesis.

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