①Do you believe a rose plant says " I want some water" or a tree shouts " My arms hurt" ? Maybe you think it is impossible and you will say this could only happen in some children' s stories.
②In fact, plants are not always silent. A recent study has found plants shout when they are in need of water or having their stems cut. " Even in a quiet field, there are actually some sounds that carry information. However, the pitch is too high for people to hear, " said Lilach Hadany, a professor from Tel Aviv University.
③The researchers used microphones to record some tomato plants. They found that stressed (有压力的) plants send out more sounds than unstressed plants. " When tomatoes are not stressed at all, they are very quiet, " Professor Hadany said. They also trained a machine in telling the differences between thirsty plants and cut plants. The result shows that when the causes of stress change, they shout differently. After the team recorded many kinds of other plants, they found that many plants like corn, wheat and grape plants send out sounds when they are under stress, too.
④" There is a possibility that a lot of communication is happening, " Professor Hadany said. " Because other plants can probably hear the call of the stressed plants. "
⑤Sound recordings of plants could bring humans a lot of advantages, especially in farming. For example, people will make sure whether corn is getting enough water or where water is needed most without much difficulty. The study can help farmers to improve their harvest (收成) and increase their income.
