REGULATORY SIGNALS. “Evidence was found for a link between electrical signals and photosynthesis as well as respiration. Wound-induced VPs cause a transient suppression in photosynthetic activity and an increase in respiratory CO2 release. The results led us to conclude that different stimulation types trigger characteristic electrical signals each with specific influence on physiological processes.” (VPs = variation potentials).
http://www.sciencedirect.com/science/article/pii/S0098847214001634