Membrane potential changes in a plant cell induced by low intensityMM-microwave

摘要

It is found that mm-microwave (7.1 mm) radiation of low (10mW/sq.cm) intensity (MWR) may cause changes in the potential difference(δψm) on plasmatic membrane in green cells of a plant leaf.The initial direction of the changes induced by MWR is opposite to thatof the changes caused by temperature elevation by a magnitude equivalentto the heating of cells due to MWR absorption. When a cell is irradiatedwith MWR of high intensity the next phase of change is observed which isdue to temperature increase in the cells caused by MWR radiationabsorption. The δΨm changes induced by MWR havetransition characteristics whose parameters depend on the temperature,doping of the solution with ATP-synthetase inhibitors, and otherfactors. Comparison of the changes induced by MWR and changes due toprobable activation of ATP synthetases under heating of cells up to35° C has shown that the MWR effect is probably due to the`nonthermal' effect of the MWR on conformation of the protein portion ofthe ATP-synthetase complex leading to activation of the latter