A new study suggests that when plants are under stress, they release a high-pitched sound that is inaudible to human ears. The research, published in the journal Science, provides the first evidence that plants produce ultrasonic sounds when they are damaged, and that these sounds may help them to recover from stress.

The study was conducted by a team of researchers from the University of Western Australia and the University of Cambridge. The team used a technique called laser Doppler vibrometry to measure the vibrations of a plant leaf as it was cut with a razor. They found that when the leaf was cut, it emitted a high-pitched sound with a frequency of around 20 kilohertz. The team then tested whether this sound had any effect on the plant's ability to recover from stress. They found that plants that were exposed to the sound of a cut leaf recovered from stress more quickly than plants that were not exposed to the sound.

The researchers believe that the sound may help plants to recover from stress by stimulating their defenses. When a plant is damaged, it produces chemicals that help to repair the damage. These chemicals can also be used to protect the plant from future stress. The sound of a cut leaf may help to trigger the production of these stress-response chemicals, which can then help the plant to recover from stress more quickly. The sound may also help to alert other plants to the presence of stress, so that they can prepare themselves for stress.

The findings of this study suggest that plants may use sound to communicate with each other, and that they may use sound to help them recover from stress. This research could have important implications for our understanding of plant communication and stress response.

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