Abstract
1. The influence of ammonium phosphate buffers on penetration of 2,4-dichlorophenoxyacetic acid (2,4-D), a-naphthaleneacetic acid (NAA), and 3,6-endoxohexahydrophthalic acid (Endothal) into young bean leaf tissue was studied by measuring internode growth following treatment. 2. Uptake of these biologically active acids was found to be completely independent of their state of dissociation. The plant responses appeared to be mediated instead by the buffer anions. 3. H2PO- 4 enhanced uptake, while HPO-- 4 inhibited it. This ion antagonism resulted in growth inhibition which was proportional in magnitude to the concentration differential of the ion present in excess. This relationship produced empirical correlations between percentage internode repression and curves of buffer capacity.
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