Effect of salicylic acid on the proton translocation activity of plasmalemma of potato tuber cells

Action of salicylic acid (SA) on the activity of membrane bound H⁺-ATPase and passive proton permeability of plasmalemma membrane vesicles (PMV) from parenchyma cells of potato tubers was detected. A correlation between SA action on germination of tubers and activity of plasmalemma H⁺-ATPase was revealed: the application of growth-stimulating concentrations of SA (10⁻¹⁰–10⁻⁸ M) in the system in vitro resulted in activation of plasmalemma H⁺-ATPase, while the use of growth-inhibiting concentrations (10⁻⁴, 10⁻⁵ M) provoked inhibition of the enzyme activity. Addition of jasmonic acid (JA) to the incubation mix resulted in increase of SA effect on the accumulation of H⁺ in PMV.