In ancient times, there was a child named Shy. His parents passed away very early. Since childhood, he has been herding cattle and living in a shack made of branches and thatch. There is a lotus pond next to the straw shed. Every summer evening, he came back from herding cattle and looked at the lotus pond shyly. He was so happy that he couldn't help playing the flute.
The wonderful flute touched the lotus fairy in the lotus pond. She likes the shy flute and sympathizes with the life experience of shy evil deeds, so she becomes a village girl and comes to a shy shack. Shy is a very honest child. When he saw a girl come to his cabin, he blushed and said, "Who are you?"
Fairy Lotus said, "My family used to live outside the village. I fled here because my parents forced me to marry a rich old man. I haven't eaten for several days. "
I am embarrassed to take out what little food I have for that girl. The girl asked about her shy life experience and told him shyly.
The Lotus Fairy said, "You and I are both unlucky people. Let's be together." .
Seeing that the girl was kind-hearted, I was ashamed and agreed. They buy materials and build houses. The villagers were all happy for him when they saw that they were ashamed of having a home and married a daughter-in-law.
I was ashamed to buy two acres of land with the rest of the money, and the husband and wife lived a life of male ploughing and female weaving. The couple were idle, sitting by the lotus pond and enjoying the lotus flowers.
One year, there was a severe drought and the crops failed to harvest. Ashamed to say to his wife, "I'm going out hunting."
Fairy Lotus wanted to tell him not to worry about food and clothing, but he was afraid that shyness would turn him into a lazy person and make him afraid that the fate of husband and wife would not last long, so he didn't stop him.
It's shameful to hunt in the mountains every day. I can still live by bringing some game back to dig some herbs every day.
One day, I went shyly into the mountains all day long and didn't go home at night. The lotus fairy was very anxious at home, but she was ashamed and didn't come home for three days. The fourth morning, the fairy decided to look for him.
The lotus fairy searched for a long time in the mountains, and finally found a shy hunting bow and arrow and an iron hoe to dig medicine in a cave mouth. She shouted a shy name at the mouth of the cave and walked out of the cave in shame, followed by a coquettish woman. The lotus fairy recognized it at a glance. She is the apricot essence in the mountains.
Fairy Lotus was supposed to expose her, but she was afraid that she would be ashamed to doubt her identity. So she left shyly without saying anything.
Apricot flower essence chased after and shouted: "shame, you and I have only been married for a few days." You can go, but you have to look at me again. "
The lotus fairy warned shyness and said, "No!" But I was ashamed and turned back. At this time, he and apricot essence were gone.
Lotus fairy looked at it for a long time and all she saw were shy bones. The lotus fairy told the villagers that shyness was eaten by the tiger. In fact, she knows that apricot essence drank shy blood and ate shy meat. She regretted not stopping shyness from entering the mountain.
The lotus fairy goes to the shy grave every day and says, "shame, why don't you listen to me?"
Later, a grass that no one had ever seen grew on the shy grave. Whenever the Lotus Fairy speaks, he lowers his head.
Later, the lotus fairy left, and the grass was still there. Strangely, as long as people poke the grass with their fingers, the branches and leaves of the grass will droop immediately, so people named this grass "Mimosa".
Extended data
Perceptual characteristics of mimosa;
Unlike animals, plants have no nervous system, no muscles, and will not perceive external stimuli. Different from ordinary plants, mimosa will lower its petiole and close its small leaves when exposed to the outside world. This action is understood as "shyness", so it is called mimosa, grass that knows shame and grass that is afraid of ugliness. ?
Mimosa cells are supported by tiny reticular protein "actin" (that is, occipital sensitive contraction protein). When the closing movement occurs, the phosphate of actin will fall off. As long as the mimosa is allowed to absorb the compound that prevents the phosphoric acid from falling off, it will not change when touched.
When the actin bundle is dispersed, the cells are destroyed, and as a result, water runs out, leading to closed movement. Actin generally exists in animal muscle fibers and is related to muscle contraction. It is also found in mimosa, which is quite rare. ?
The movement of plants is usually caused by the change of intracellular expansion pressure. Most mature plant cells have a large vacuole. When the vacuole is filled with water, it will press the surrounding cytoplasm tightly against the cell wall, giving the cell wall a kind of pressure and making the cell swell hard, just like an inflated balloon.
The concentration of organic and inorganic substances in vacuoles determines the osmotic pressure, which can determine the diffusion direction of water. When the vacuole concentration increases, the osmotic pressure increases, and water diffuses from outside the cell into the vacuole, which increases the swelling pressure of the cell and makes the cell swell. On the contrary, cells will shrink. This process can only cause slow movements, such as the opening and closing of pores. ?
If you touch the leaves of mimosa, it will be closed immediately. The greater the impact, the faster the closing speed, and the whole leaf hangs down like a faint, and the whole action is completed in a few seconds.
The leaves and petioles of mimosa have special structures. There is a relatively enlarged part on the petiole and leaflet base of compound leaves, which is called leaf pillow. Leaf pillow is the most sensitive to stimulation.
Once it touches the leaf, the stimulus immediately spreads to the leaf pillow at the base of the petiole, so that the two small leaves are closed, and the tactile force is strong, not only to the leaf pillow of the lobule, but also to the leaf pillow at the base of the petiole soon, and the whole petiole droops. Why is this happening? This is because there is a large vascular bundle in the center of occipital bone, which is surrounded by parenchyma and has many intercellular spaces.
When the vibration is transmitted to the occipital lobe, the cellular fluid in the parenchyma cells in the upper part of the occipital lobe is discharged into the intercellular space, which reduces the swelling pressure of the cells in the upper part of the occipital lobe, while the original swelling pressure is maintained in the lower intercellular space. As a result, the leaflets stand upright, the two leaflets are close together, and even the whole leaf hangs down.
It has been studied that mimosa leaves will close within 0.08 seconds after being stimulated. After stimulation, the conduction speed is also very fast, and the highest speed reaches 10 cm per second. After the stimulation, after a while, everything slowly returned to normal, the leaflets unfolded again, and the petiole stood up.
The recovery time is generally 5- 10 minutes. However, if you continue to tease and stimulate its leaves one by one, it will feel "bored" and no longer respond. This is because the continuous stimulation makes the cell fluid in the occipital lobe cells lose and cannot be replenished in time. ?
This special skill of mimosa has its historical roots. Its hometown is Brazil in tropical South America, where there are often strong winds and heavy rains.
Whenever the first drop of rain hits the leaves, it immediately closes the leaves and hangs down the petiole to avoid the damage of the storm. This is an adaptation to changes in external environmental conditions. In addition, the movement of mimosa can also be regarded as a way of self-defense. When the animal touched it lightly, it closed the leaves, and the animal dared not eat any more. ?
Petiole and petiole base have an enlarged part called "leaf mattress". The leaf pad is very sensitive to stimulation, and there are many parenchyma cells in its central part. When these cells are at rest, they will transport negatively charged chloride ions into the cells, and at the same time transport oxygen ions outside the cells, so as to keep a certain potential difference between the cell membrane and the adjacent areas, which is called electrostatic potential.
When the external stimulus exceeds a certain limit, this differential permeability will suddenly change, and a large number of positively charged calcium ions will flood into cells, while potassium ions will do the opposite, which will increase the potential in the membrane and even become positive potential, thus generating action potential. This phenomenon is called depolarization.
Reference from: Baidu Encyclopedia-Mimosa