Abstract
Abstract. Velocities of transport of IAA through long‐celled (dark‐grown) and short‐celled (light‐grown) coleoptile segments have been measured by the intercept method. Transport is faster through short‐celled segments, and the difference is highly significant. Calculations show that this finding is consistent with a model for polar auxin transport which postulates a pumping mechanism between cells and movement through the cell by diffusion.
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