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Study shows plant hydraulics create streaming electric potential in sync with biological clock

Harnessing green energy from plants depends on their circadian rhythms
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. According to the authors, this consistent, cyclic voltage creation could be harnessed as an energy source. Credit: Aniruddha Guha

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. In plants, this daily cycle includes capturing light energy for photosynthesis and absorbing water and nutrients from the soil during the day and slowing its growth processes at night.

In a study published this week in Physics of Fluids, researchers from the Indian Institute of Technology Kharagpur detailed how produce voltage in plants and the impact of the cyclic day and night changes on this voltage.

"This streaming potential, essentially a consequence of the natural energy gathered in the plant, offers a that is continuous and can be sustainable over long periods," author Suman Chakraborty said. "The question we wanted to answer was how much potential it can produce, and how is influenced by the plant's biological clock?"

To find out, the authors inserted electrodes into the stems of water hyacinths and attached reservoirs with electrodes to pieces of lucky bamboo to closely examine how electrical potential changes depending on types of ions, ion concentration, and the pH of the fluid flowing through the plants.

"Our eureka moment was when our first experiments showed it is possible to produce electricity in a cyclic and the precise linkage between this and the plant's inherent daily rhythm," Chakraborty said. "We could exactly pinpoint how this is related to water transpiration and the ions the plant carries via the ascent of sap."

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.

"We not only rediscovered the plant's electrical rhythm, articulating it in terms of voltages and currents, but we also provided insight into potentially tapping electrical power output from plants in a sustainable manner with no and no disruption to the ecosystem," Chakraborty said.

"The findings could help develop biomimetic, nature-inspired systems that can address the global energy crisis with an eco-friendly, sustainable solution in which planting a tree not only relieves the crises of climate change and declining , but also provides a way to harness electricity from it."

More information: How does the diurnal biological clock influence electrokinetics in a living plant?, Physics of Fluids (2024). DOI: 10.1063/5.0195088

Journal information: Physics of Fluids

Citation: Study shows plant hydraulics create streaming electric potential in sync with biological clock (2024, May 28) retrieved 21 June 2024 from https://phys.org/news/2024-05-hydraulics-streaming-electric-potential-sync.html
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