Poplar trees send slow electric signals when bent or stressed
Tinturier E, Badel É, Leblanc-Fournier N, Guéna G, Forterre Y
Plant Signaling
The next time wind bends the sapling you planted last spring, its trunk is running an internal electrical report on exactly how hard and fast it got pushed, a signal that may shape how it thickens its trunk or braces its roots.
Scientists bent young poplar tree stems and measured the electrical signals that traveled through them, discovering a slow, gradual pulse of electricity that is different from the fast action potentials some plants use. The strength of this signal right where the tree was bent stayed the same no matter how gently or roughly it was pushed, but how far and how cleanly that signal traveled down the trunk depended on how fast and hard the bending happened. The same kind of signal showed up when they pressurized the tree's roots, suggesting the tree's water-transport system and its electrical signaling are linked in a way that isn't fully explained by simple pressure spreading through the plant.
Key Findings
Poplar stems produce a 'gradual potential' (GP) distinct from classical action potentials in response to mechanical bending
GP peak amplitude at the stimulation site stays constant regardless of bending speed or force, but propagation distance and signal decay depend strongly on stimulus speed and intensity
Root pressurization produces similar GP responses to stem bending, linking hydraulic (water pressure) changes to electrical signaling, though the waveform narrowing observed points to an active nonlinear process beyond simple pressure diffusion
chevron_right Technical Summary
When trees get bent by wind or touch, they send a slow electrical signal (not the quick zap seen in Venus flytraps) that reports how fast and hard they were pushed. The discovery helps explain how trees sense and respond to mechanical stress like wind, which matters for understanding tree resilience.
Abstract Preview
Original paper
Bending and squeezing: gradual electric potentials encode mechanical stimuli in poplar.
Mechanical stimuli such as wind elicit rapid electrical signals in plants, yet the mechanisms underlying these responses remain poorly understood. Here, we investigated the electrophysiological res...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Populus is a genus of 25–30 species of deciduous flowering plants in the family Salicaceae, native to most of the Northern Hemisphere. English names variously applied to different species include poplar, aspen, and cottonwood.