The Light Eaters: How the Unseen World of Plant Intelligence Offers a New Understanding of Life on Earth

by Zoë Schlanger

Of course plants don’t have neurons or brains. But research was suggesting they might have analogous structures, or at least some physiology that could do similar things, and a cognitive capacity that deserved to be taken seriously. Plants produce electrical impulses, and seem to have nodes at the tips of their roots that serve as local command centers. Glutamate and glycine, two of the most common neurotransmitters in animal brains, are present in plants also, and seem to be crucial to how they pass information through their stems and leaves. They have been found to form, store, and access memories, sense incredibly subtle changes in their environment, and send highly sophisticated chemicals aloft on the air in response. They send signals to different body parts to coordinate defenses. Plant neurobiology “aims to study plants in their full sensory and communicative complexity,” they wrote.