Primary response of plasma membrane potential on root caps of Ammopiptanthus mongolicus and Phaseolus radiatus to salt stress
Changes of the plasma membrane potential on root caps of Ammopiptanthus mongolicus and Phaseolus radiatus were real-time recorded using microelectrodes under different univalent cations. Influences of different plasma membrane transport protein inhibitors(Vanadate,TEA)on the membrane potential in the root cap of A . mongolicus and P. radiatus had also been studied. The results showed that different univalent cations(50,100, 200 mmol/L)uptake by the roots made plasma membrane potential depolarized. For the same cation, firstly, the magnitude of depolarization increased with the rising of univalent cation concentrations. Secondly, in the condition of different cations with the same concentration, univalent cations have various hydrated radius(K+< Na+ < Li+) , which making them have different transit rates into roots(K+> Na+ > Li+) . Thus, the magnitude of depolarization was also different(K+> Na+> Li+). Finally, in terms of different plants with the same cation and concentration, P. radiatus has higher magnitude of depolarization than A. mongolicus. Namely, Na+ uptake by the roots of P. radiatus was stronger than that of A . mongolicus . H+ -ATPase and K+ channel are involved in the primary response of salt tolerance. K+ channel may be a way that Na+ transits into root.
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