Abstract
The polar, basipetal transport of indoleacetic acid helps to maintain polarity of auxin movement in coleoptiles of Avena sativa L. by opposing acropetal diffusion. This conclusion is supported by 3 different kinds of experiments. In all 3 experiments, sections took up 14C carboxyl-labeled indole-3-acetic acid anaerobically, and the distribution of auxin within all sections was similar at the end of uptake.
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