POLARIZATION. “As in the case of animal APs, ion channels mediate the generation of APs in plants. In addition, another type of long-distance signaling exists in plants: slow wave potentials (SWPs) (aka variation potentials, VPs). Both APs and SWPs (VPs) share the three-fold phase of depolarization–repolarization–hyperpolarization of animal APs.” (VPs = variation potentials; APs = action potentials).
http://link.springer.com/article/10.1007/s11229-016-1040-1