The stressed plants created a type of popping and clicking sound, which researchers said the frequency of these noises is too high for humans to detect - but these sounds can possibly be heard by other plants and mammals.
The reason for these noises remains unclear, but the study suggests that it might be due to the formation and bursting of air bubbles in the plant's vascular system - a process known as cavitation.
Speaking on plants and their communication with their environment, Professor Hadany said"it's possible that other organisms could have evolved to hear and respond to these sounds". "For example, a moth that intends to lay eggs on a plant or an animal that intends to eat a plant could use the sounds to help guide their decision," she added.The authors also found that these sounds could benefit other plants, as previous research has found plants can respond to sounds and vibrations.
"We know that there's a lot of ultrasound out there every time you use a microphone, you find that a lot of stuff produces sounds that we humans cannot hear - but the fact that plants are making these sounds opens a whole new avenue of opportunities for communication, eavesdropping, and exploitation of these sounds," said co-senior author Yossi Yovel, a neuro-ecologist at Tel Aviv University.
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