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Effects of Inorganic Solutes on the Binding of Auxin ¹

^a Department of Horticulture, Purdue University, Lafayette, Indiana 47907

The binding of -naphthaleneacetic acid (¹⁴C-NAA) to pelletable particulates from corn (Zea mays) coleoptiles was found to be influenced by inorganic solutes. La³⁺, Ca²⁺, and Mg²⁺ increased the binding whereas monovalent cations did not. The concentrations of CaCl₂ which increased auxin binding were similar to those which inhibited coleoptile elongation in the presence of auxin. These results are interpreted as suggesting that the alteration of hormonal effectiveness by some inorganic solutes involves alterations in the attachment of the hormone to binding sites in the cell.

³ Present address: Graduate College, University of Nebraska, Lincoln, Nebraska 68583.

¹ Journal Paper No. 5754, Agricultural Experiment Station, Purdue University, Lafayette, Ind. 47097.

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