Electrochemical Investigations of Plant Response to Salt Stress: Insights Through Impedance Studies of OECT‐Based Biosensor

Organic Electrochemical Transistor fabricated from conducting polymer material, PEDOT: PSS has been demonstrated towards study of plant response to salt stress. Electrochemical impedance spectroscopic studies of OECT under both in‐vivo and in‐vitro salt stress monitoring conditions have been carried out. Change in ionic concentration induced in the biological system of a living plant subjected to salt stress has been elucidated in terms of change in impedance of biosensor integrated in its stem. The impedance data recorded was used to derive equivalent distributed‐element circuit models for the device, under both in‐vivo and in‐vitro conditions. EIS technique has been utilised to carry out electrochemical investigation of OECT device integrated in a plant subjected to salt stress. Impedance studies of the OECT device were aimed at understanding the plant's response towards salt stress. Biological mechanism responsible for change in impedance of in‐vivo OECT‐based biosensor has been verified by impedance data recorded for the in‐vitro OECT‐based device, under salt stress conditions. Equivalent circuits were derived for the device from the impedance data recorded.