Plants don’t have nerves. But when they’re injured, they send an electrical “SOS” that looks very familiar.
When a leaf is cut or bitten, glutamate (the same amino acid that acts as a neurotransmitter in humans) spills out of the damaged cells.
In plants, that glutamate flips on a series of glutamate-gated receptors, triggering a rapid calcium wave that races through the stem and leaves.
It’s not pain. It’s not consciousness.
But it is a long-distance danger signal.
And what happens next is biology at its best:
• Distant leaves ramp up their defenses
• Genes for protection and repair switch on
• Chemical pathways shift to heal tissue and deter future damage
Humans use glutamate to communicate between neurons.
Plants use it to communicate between cells and tissues.
Two completely different systems, one molecule playing messenger in both.
A reminder that living things often solve survival problems using the same biochemical tools… even when evolution sends them down very different paths.
From: Gatsby Plant Science Education Program