Bioelectrochemical signaling in green plants induced by photosensory systems.

Plants generate various types of intracellular and intercellular electrical events in response to environmental stress. The generation of electrophysiological responses induced by blue and red photosensory systems was observed in soybean plants. A phototropic response is a sequence of the following four processes: reception of a directional light signal, signal transduction, transformation of the signal into a physiological response, and the production of a directional growth response. It was found that the irradiation of soybean plants at 450+/-50, 670, and 730 nm induces action potentials with duration times and amplitudes of approximately 0.3 ms and 60 mV respectively.