Abstract
AbstractA study was made of the inhibition of auxin transport in Avena coleopliles by 2, 3, 5‐triiodobenzoic acid (TIBA), using carboxyl labelled 14C indole‐3‐acetic acid (IAA). A transport period of 1 hour followed by an export period of 2 hours was used routinely. Treatment with TIBA resulted in increased radioactivity remaining in the coleoptile sections after the export period. This radioactivity was distributed throughout the length of the coleoptile. The increase in radioactivity was shown to be due to an increase in the amount of IAA immobilized. The action of TIBA in inhibiting auxin transport is achieved by the promotion of the immobilization of IAA.
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