When in January 2012, Risto Mejide said that of “You sing like a diva, but you move like a plant“I did not know that I was completely wrong. And not only for Natalia, the contestant of ‘You do vouchers’ to which he directed those pearls, but because, under that static appearance, the plants do not stop doing things.
And not by chance, no. Plants are not only able to detect threats, but activate a whole series of defensive reactions that have intrigued scientists for decades.
Everything starts with a bite. Heidi Appel and Rex Cocroft met at a seminar at the University of Missouri and, quickly, saw that His interests fit. Cocroft was one of the great experts in biotremology (the branch of biology that studies the role of vibrations and sound in life) and had been analyzing how insects use the stem of plants to communicate.
Do you listen? Apple was an expert in ecological chemistry and listening to those recordings (specifically how the caterpillars of the butterflies of the Col bit tiny mustard plants) had an idea: what if the plants could listen to them? And if that explained that, suddenly, plants activated a whole series of physiological reactions to “attack” the caterpillars?
Answering that question was not easy. We had to measure laser vibrations and try to understand what plants could really hear. On the other hand, we had to quantify “how plants care and how.” However, it was enough to measure in real time what happened to the first bite of an caterpillar to verify that, indeed, the plants listened.
And not just that. “What is surprising and great is that these plants only create defense responses to feeding vibrations and not to wind or other vibrations in the same frequency as the chewing caterpillar,” Appel explained. They discovered that, in fact, it was enough to expose plants to the sound of chewing so that glucosinolate levels (that defensive response) triggered.
Does this mean that putting music to plants is a good idea? No, it doesn’t mean that. “This field is somewhat obsessed with its history of putting music to plants. That kind of stimulus is so far from the natural ecology of plants that it is very difficult to interpret their answers,” Cocroft explained. What it really means is that what we usually think about plants is often wrong.
A mistake that, little by little, we are waking up.
Image | Annie Spratt
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