Research found that stressed plants are raising `` sounds of ultrasound ''
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Humans may scream when frustrated or angry, but from experiments conducted by a research team at the Tel Aviv University of Israel, `` plants also scream ultrasound when exposed to stress '' Turned out.
Plants emit informative airborne sounds under stress | bioRxiv
https://www.biorxiv.org/content/10.1101/507590v4
Plants 'Scream' in the Face of Stress | Live Science
https://www.livescience.com/plants-squeal-when-stressed.html
Plants tend to seem to stay still no matter what happens in their surroundings, but like humans and other animals, plants are found to respond to external stimuli in various ways. Is. In 2014, experiments using oakweed showed that oakweed had a kind of learning function, and research results that you can `` hear ' ' the mumbling sound when plants are eaten by pests It has been announced.
A study published in 2019 found that some sweet potato varieties use 'smell' to convey enemy attacks to surrounding individuals. Plants do not always respond to external stimuli, but respond more diversely than people imagine.
There are varieties of sweet potato that convey enemy attacks to other sweet potatoes with `` smell ''-gigazine
The research team of Tel Aviv University, went to the 2013 study in, we were able to detect a 'very small sound that occurred in the plant stems' by attaching a recording device to the plant. The noise was caused by the formation of bubbles in plants stressed by the drought, which burst and caused vibrations in the water-carrying tissues.
In past research, sound was detected by a recording device attached to the plant itself, but the research team conducted a new experiment to investigate `` whether the sound emitted by the plant is also heard in the surroundings through the air '' The we.
The research team placed three sets of tomatoes and tobacco , which are widely cultivated worldwide, in each environment of a greenhouse and a soundproof room, and installed a microphone about 10 cm away. The crops were placed under the following three conditions: 'drought stressed water shortage,' 'stem cut stressed physical damage,' and 'unstressed stress.' He said he made sure that the sound emitted was recorded in the microphone through the air.
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Experiments show that each of the stressed crops emits inaudible ultrasound at 10-100 kHz to human ears, and that sound was recorded by microphones 10 cm away in both the greenhouse and the soundproof room. Did. Although this sound is inaudible to human ears, the research team says that some animal species may be able to detect plant sounds from several meters away.
In this experiment, it was also found that the frequency of sound emission differs depending on the type of plant and the type of stress. For example, drought tomatoes sounded on average 35 times per hour, and cut tomatoes sounded about 25 times per hour. On the other hand, drought tobacco sounds 11 times per hour, and cuts 15 times per hour when cut, and the same stress factors produced different results for different plant types. That. Intact crops, which served as controls, only sounded less than once per hour.
In addition, the research team focused on the fact that the sound of each crop sounds different depending on the stress factor, and also investigated the question, 'Can the plant sound alone determine the type of plant and the stress received?' did. After training the machine learning algorithm and trying to classify by plant sound, he said that he was able to judge three types of situations, 'drought, cut, and intact,' by sound alone. The research team believes that this technology will allow farmers to sort out drought-resistant individuals from equipment installed in their fields.
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In this study, we did not examine conditions such as exposure to disease, too high salinity in the soil, and inappropriate temperature, so it is unclear whether plants will make sounds in response to any stress. . However, the researchers said they have successfully recorded similar sounds on a variety of plant types besides tomatoes and tobacco.
Also, because the sound emitted by the plant may be detected by other animals, the research team said that insects such as moths may have heard the sound emitted by the plant and may be selecting plants that lay eggs. Suggested. However, since the insect response was not actually confirmed in this regard, outside experts have pointed out that 'they have jumped too far.'
by Roman Kasner
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