Connecting The Dots Project
Do distressed plants cry?
Plants Under Stress Cry (and some animals may be able to detect the sound)!!
Plants can emit ultrasonic sounds, similar to the popping of bubble wrap, when they are stressed or lack water. These sounds, are inaudible to humans but detectable by certain animals. Researchers recorded these sounds from tomato and tobacco plants by developing a machine-learning model capable of identifying the sounds that stressed plants produced, with a 70% accuracy rate. They observed that the stressed plants could produce up to 35 sounds per hour, while well-hydrated and uncut plants typically generated only about one sound per hour. These sounds fall within the ultrasonic range, ranging from 20 to 100 kilohertz, rendering them imperceptible to most humans. Nonetheless, the study also suggests that other animals might theoretically perceive these sounds from a distance of approximately 10 to 15 feet.
Detecting sounds
The researchers hypothesize that these sounds result from the formation and rupture of air bubbles within the xylem, the plant's water and nutrient transport system. When water is scarce, bubbles are more likely to form, creating a popping noise. Therefore, this discovery holds the potential to enhance irrigation efficiency through the use of microphones to detect when plants require water. The implications of this research may hold significant promise for agriculture and horticulture. Audio monitoring of plants could offer an efficient means of identifying water-stressed plants, facilitating targeted watering practices and potentially reducing water consumption. Preliminary investigations suggest that other crops, such as wheat, corn, and wine grapes, also produce sounds when experiencing thirst.
Exploring the possibility
Beyond its practical applications, the study raises intriguing questions about the role of plant sounds in ecosystems. Although it remains unclear if these sounds constitute a form of communication, they could prove valuable for nearby creatures, potentially influencing their behavior. Interestingly, Hadany’s team has previously found that plants can respond to sounds produced by animals, like the buzzing of bees, by releasing sweeter nectar. Could plant sounds serve as a means for plants to communicate with each other and with the animals in their vicinity? Can animals use these sounds to locate water sources or food? The evidence remains inconclusive, necessitating further research to explore these questions.
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