Abstract
A model based on the principles of network thermodynamics is presented for the simultaneous, coupled transport of water and trace organic solute throughout the plant. This application of network thermodynamics to short- and long-distance transport processes in plants is unique. The coefficients of the model are the mathematical representation of the physical, chemical, anatomical and physiological processes controlling transport and accumulation in plants. As an example a single leaf and single root representation of a soybean plant is given. Using literature values for model coefficients, the flux of water and the accumulation of a solute in the soybean plant were calculated under conditions of constant transpiration rate. The chemical was assumed to be passively transported throughout the plant. The application demonstrates how local chemical transport mechanisms play a large role in long-distance transport and tissue retention characteristics. Dynamics of the model simulation agree with uptake characteristics of organic chemicals observed experimentally.
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