The Effect of 2,4-Dichlorophenoxyacetic Acid and 2,3,5-Triiodobenzoic Acid on the Transport of Indoleacetic Acid

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Abstract
Transport of indoleacetic acid through excised 5 mm. sections of stems and roots from bean seedlings to agar blocks at the basal ends was measured with the Avena agar test. Considerably more moved through petiole, epicotyl and hypocotyl sections than through root-stem juncture or root sections. Pre-treatment of leaves of the intact seedlings or the stem sections themselves with 2,4-dichlorophenoxyacetic acid or 2,3,5-triiodobenzoic acid greatly inhibited subsequent translocation of indoleacetic acid through stem sections.

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