A groundbreaking study demonstrates that plants can generate electricity that varies with their circadian rhythms, opening up new possibilities for environmentally sustainable energy production. Credit: Aniruddha Guha, edited
When plants draw water from their roots to nourish their stems and leaves, they produce an electric potential that could be harnessed as a renewable energy source. However, like all living things, plants are subject to a circadian rhythm — the biological clock that runs through day and night cycles and influences biological processes.
Plant hydraulics drive the biological process that moves fluids from roots to plant stems and leaves, creating streaming electric potential, or voltage, in the process. This study closely examined the differences in voltage caused by the concentrations of ions, types of ions, and pH of the fluid plants transport, tying the voltage changes to the plant’s circadian rhythm that causes adjustments day and night.
The study quantified the voltage response originating from the movement of ions through the plant’s pathways that align uniquely with the plant’s daily rhythms.The authors discovered plants can actively moderate the flow of fluid or sap in sync with the day and night cycles. They also found the electric streaming potential increases with decreased concentration of ions or increased pH in the fluid.
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