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Plant Physiology 50:784-787 (1972) © 1972 American Society of Plant Biologists Polar Indole-3-acetic Acid Diffusion in Nonliving and Model SystemsPlant Science Research Division, Agricultural Research Service, United States Department of Agriculture Beltsville, Maryland 20705 Polar indole-3-acetic acid movement was observed in killed plant segments and in artificial model systems. The polar diffusion of indole-3-acetic acid was observed in tissue killed by chemical or physical means in an agar-plant system and in a multicelled Plexiglas dialysis chamber containing hypocotyl tissue gradients or gradients of anion exchange material. It was suggested that polar indole-3-acetic acid movement in excised segments may be a reflection of the diffusion of indole-3-acetic acid through asymmetric gradients of materials with binding characteristics somewhat similar to ion exchange.
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