THE EFFECT OF THE PLANT HORMONE ABSCISIC ACID ON LIPID BILAYER MEMBRANES

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Summary

In the presence of the plant hormone 2-cis,4-trans abscisic acid, bimolecular lipid membranes exhibited conductance fluctuations of the type associated with channels. Under a voltage clamp of 100 mV, channels were observed of mean conductance 0-4 × 10−10 S and mean lifetime 0·2 msec.

Membrane conductance was measured as a function of concentration of abscisic acid and a log-log plot of the data revealed a linear relationship. The slope of the regression line was 0·52 ± 0·08 with Pearson's product moment 0·85.

An analysis of current fluctuations is presented.

The results are discussed in terms of a process in which multimeric channels are generated from abscisic acid monomers and in which channels are destroyed by collision.

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