Effects of Inorganic Solutes on the Binding of Auxin

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Abstract
The binding of .alpha.-naphthaleneacetic acid (14C-NAA) to pelletable particulates [cell membranes] from corn (Zea mays) coleoptiles was influenced by inorganic solutes. La3+, Ca2+ and Mg2+ increased the binding; 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 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.