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Articles

Solution-Flow in the Phloem

I. Theoretical Considerations ¹

^a Department of Botany, The Ohio State University, Columbus, Ohio 43210

A mathematical model for the reversible exchange of THO between the sieve tube lumen and its surrounding phloem tissue is used to explain the difference between the apparent velocities of THO and ¹⁴C-sucrose transport observed when both are supplied simultaneously. Theoretically predicted results show a close correlation with those obtained experimentally. This model may be used in evaluating previous work in which THO was used as a tracer. The calculations support the existence of a mass flow of sugars in aqueous solution along the path.

³ Present address: Citrus Research Center and Agricultural Experimental Station, University of California, Riverside, Calif. 92502.

⁴ Present address: Department of Physics, The Ohio State University, Columbus, Ohio 43210.

¹ Paper No. 803 from Department of Botany, The Ohio State University, Columbus, Ohio.