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The Influence of Gibberellic Acid on the Permeability of Model Membrane Systems

^a Department of Plant Physiology, Waite Agricultural Research Institute, The University of Adelaide, Glen Osmond, South Australia

Gibberellic acid increases the permeability of model membranes composed of various plant-source lipids, a sterol, and dicetyl phosphate. As a result of hormone treatment, the flux of uncharged molecules such as glucose or sucrose, or charged ions such as chromate, through the model membranes (liposomes or micelles) is increased. The revelance of this finding to the in vivo effects of the hormone is briefly discussed.