(David Nield) A new study offers a better understanding of the hidden network of underground electrical signals being transmitted from plant to plant – a network that has previously been shown to use the Mycorrhizal fungi in soil as a sort of electrical circuit.
by David Nield, July 14th, 2020
Through a combination of physical experiments and mathematical models based on differential equations, researchers explored how this electrical signalling works, though it’s not clear yet exactly what messages plants might want to transmit to each other.
The work builds on previous experiments by the same team looking at how this subterranean messaging service functions, using electrical stimulation as a way of testing how signals are carried even when plants aren’t in the same soil.
“We can use the math model for simulating the studied processes on a computer instead of running expensive and lengthy experiments,” says electrical engineer Yuri Shtessel from the University of Alabama in Huntsville.
Together with biochemist Alexander Volkov from Oakwood University, Shtessel tested communications between different types of plants in separate pots, both with and without an air gap.
Without an electrical conductor connecting them, the connection was broken. With a silver wire in place, the network was back up and running, which suggests any sort of electrical conductor can be utilised for these plant-to-plant chats.
What’s more, the message networks seemed to stay in place and to take a similar form across different types of plant – Aloe vera and cabbage plants were used in the new research, while previous experiments looked at the same kind of signalling between tomato plants. The models suggest different types of plant may be able to communicate in the same way.
“I think that it is definitely possible that signals can propagate through the root network and spread in the common ground or soil from a tomato plant to, let’s say, an oak,” says Shtessel. “The soil plays the role of a conductor.”
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While this newest study doesn’t reach any firm conclusions about what’s being said between plants, or how much of the communication is intentional or not, it does show the potential for messages to be sent about threats to plants, their growth, or plant movement.
It also shows that the Mycorrhizal networks in the soil previously identified in other studies aren’t necessarily required for a plant-wide web of communication to be established – all of which poses some interesting questions for future study.
Add this to the list of interesting discoveries about plants – from how they respond to touch to how we might eventually be able to communicate with them – and the study throws up all sorts of interesting avenues for future research.
“No study of the cognitive processing of the electric signals passed and received by the plants was accomplished,” says Shtessel.
“Another issue is to study the plants’ communications via electric waves through the air. This is a different story that has not been deeply studied yet.”
The research has been published in Communicative & Integrative Biology.
About The Author
David Nield is a Contributing Journalist at ScienceAlert. He’s a freelance journalist who has been writing about science and technology for more than 20 years. Dave’s work has appeared in a wide range of publications, including Wired, Popular Science, The Guardian, and Gizmodo, and he has been reporting for ScienceAlert across a wide range of subjects since 2015.
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