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Solution-Flow in the Phloem

II. Phloem Transport of THO in Beta vulgaris¹

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

Translocation profiles along the path were studied using a modified flap-feeding technique for the simultaneous application of THO and ¹⁴C-sucrose. A re-evaluation of a mathematical model for phloem transport with reversible lateral exchange of tracer along the path indicates that lower apparent velocities for THO as compared to labeled carbohydrate are primarily due to extensive lateral exchange of THO along the conduction path. Path-chilling experiments support the concept that THO and ¹⁴C-sucrose exhibit different lateral exchange characteristics. The data presented are consistent with a solutionflow mechanism.

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

¹ Paper No. 804 from Department of Botany, The Ohio State University, Columbus, Ohio.