Abstract
Four groups of plant growth substances (the auxins, gibberellins, abscisic acid and cytokinins) were tested as to their effects on increasing the permeability of egg phosphatidylcholine liposomes to erythritol and urea. The cytokinins (kinetin and benzyladenine) produced permeability changes down to about 30 μM for erythritol or urea while the auxins (indoleacetic, indolebutyric and indolepropionic acid), gibberellic acid and abscisic acid affected permeability only at much higher concentrations (above 1300 μM). These results question the physiological significance of the auxins, gibberellic acid and abscisic acid as lipid bilayer perturbing agents.
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