Updated

Updated · The Guardian · Jun 11

Scientists Trace Venus Flytrap’s 1-Second Snap to Cell Softening, Overturning Water-Flow Theory

Updated

Updated · The Guardian · Jun 11

Scientists Trace Venus Flytrap’s 1-Second Snap to Cell Softening, Overturning Water-Flow Theory

Q: If plants lack muscles, what does the flytrap's instant snap reveal about their hidden ability to move?

The Venus flytrap’s snap shows that plants can produce extremely fast, precise movement without muscles by rapidly changing the mechanical properties of their cells. The new research indicates that when an insect bends the trap’s trigger hairs, the plant sends an electrical signal that quickly softens cells on the outer surface of the leaf. That softening releases stored elastic energy in the curved trap, causing it to flip shut in about a second, much like a rubber popper toy snapping inside out. Researchers found the cell walls can relax by roughly 30 to 40 percent, making this one of the fastest mechanical changes ever measured in plant tissue. That matters because it overturns older ideas that the trap mainly closed through water shifting inside the leaf. Using dental glue to hold traps partly open and a nanoindenter to measure stiffness, the team showed the key change was not water loss or deflation, but a rapid increase in cell-wall flexibility. More broadly, the finding reveals that plants have a sophisticated hidden motion system based on mechanosensing, electrical signaling and tunable cell mechanics. In other words, plants do not need muscles to move quickly: they can sense touch, alter their tissues almost instantly, and convert stored internal stress into action. The Venus flytrap is an extreme example of a wider plant ability to detect and respond to the physical world with far more speed and control than once assumed.

3 articles · Updated · The Guardian · Jun 11

Outer leaf cells in the Venus flytrap soften immediately after its trigger hairs fire, letting the trap flip shut in under 1 second, according to a Science study.
Researchers reached that result by immobilizing leaves with dental glue and probing them with a nanoindenter, showing the surface became less stiff after activation.
Those measurements indicate the snap comes from cells rapidly changing mechanical properties, not from water moving out of the tissue — the leading prior explanation.
The work resolves a puzzle that had persisted since Darwin, who thought the plant’s speed implied a muscle-like mechanism even though plants lack muscles and nerves.