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Health & Fitness Plants emit ultrasonic ‘scream’ when they are hurt, researchers find

22:15  10 december  2019
22:15  10 december  2019 Source:   uk.news.yahoo.com

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  Plants emit ultrasonic ‘scream’ when they are hurt, researchers find © Getty Here’s a finding which might give vegans pause for thought: some plants emit an ‘ultrasonic’ scream when they’re stressed out. 

Researchers placed microphones a few inches from tomato and tobacco plants, and deprived them of water and cut their stems. 

The plants emitted an ultrasonic signal between 20 and 100 kilohertz, the researchers found. 

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The Tel Aviv University researchers believe that the signals may communicate distress to other plants, LiveScience reported.  

When a tomato plant’s stem is cut, it emits 25 ultrasonic distress sounds over the course of an hour, the researchers found. 

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Tomato plants made up to 35 distress signals an hour when deprived of water. 

The researchers wrote, ‘‘These findings can alter the way we think about the plant kingdom, which has been considered to be almost silent until now.’

The paper has yet to be peer-reviewed. 

  Plants emit ultrasonic ‘scream’ when they are hurt, researchers find © Getty

Previous research has shown that even brushing against a plant can ‘stress it out’ - meaning it ‘warns’ nearby plants that something has happened, the researchers say.

The signals take the form of chemicals secreted by roots, which tell nearby plants they’ve been in contact with something. 

Researchers believe the signals are ‘instructions’ on how to grow - based on whether nearby plants are relatives. 

Researchers led by Velemir Ninkovic from the Swedish University of Agricultural Sciences stressed out corn seedlings by touching their leaves. 

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They then watched how nearby plants grew - and saw that they directed their resources into growing more leaves and fewer roots.

Lead author Velemir Ninkovic says: ‘Our study demonstrated that changes induced by above ground mechanical contact between plants can affect below ground interactions, acting as cues in prediction of the future competitors.’

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Why you need a PLANT for your desk: Just being able to stare at a bonsai or cactus 'can calm you down and make work less stressful' .
Office workers in Japan were given a plant to care for over four weeks. A 'significant decrease' in stress was recorded during and after the month.Japanese experts studied whether a small plant could really improve mood at work, given nature is known to improve general wellbeing.

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