Abstract
This study examines two ways plant hormones might influence membrane processes, effects on overall permeability and modifications of specific ion channels. Abscisic acid (ABA) and indole-3-acetic acid (IAA) greatly enhanced erythritol permeability in mixed egg lecithin bilayers. In single component dioleoylphosphatidylcholine bilayers ABA was less effective than IAA, while 2,4-dichlorophenoxyacetate (2,4-D) did not affect either system or alter their ABA response. In Myxicola axons ABA and IAA had no effect, while 2,4-D (10 uM) caused a depolarizing shift of voltage-dependent Na + and K + activation by 25 ± 4 mV and 15 ± 3 mV, consistent with internal negative surface charge changes of −0.002 e −/A 2 and −0.0007 e −/A 2. We conclude that both generalized and ion channel-directed effects may link plant hormones and intracellular regulation.
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