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Abscisic Acid Transport Coefficients of Phaseolus Root Systems ¹

United States Department of Agriculture-Agricultural Research Service, Crops Research Laboratory, Colorado State University, Fort Collins, Colorado 80523, Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523

Diffusive and convective transport coefficients of Phaseolus vulgaris L. cv. Ouray root systems for abscisic acid for (ABA) were measured. The convective coefficient (reflection coefficient or osmotic efficiency factor) was determined to be 0.96 for ABA while the diffusive coefficient, , was found to be 1.44 x 10^–11 mole per square centimeter per second per bar. Steady-state concentrations of ABA in the root system exudates were not achieved until at least three hours after the applications suggesting either a slow saturation of binding sites or equilibration with tissues surrounding the xylem.