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THE EFFECT OF THE PLANT HORMONE ABSCISIC ACID ON LIPID BILAYER MEMBRANES
Author(s) -
LEA E. J. A.,
COLLINS J. C.
Publication year - 1979
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1979.tb07554.x
Subject(s) - abscisic acid , conductance , membrane , chemistry , lipid bilayer , biophysics , voltage clamp , biochemistry , membrane potential , biology , physics , gene , condensed matter physics
S ummary 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.