Plants are different from animals. They have no nervous system and will not perceive external stimuli. However, the world is full of wonders. There is a plant called mimosa and other plants. When they are touched by the outside world, their leaves close and their petioles droop, forming a shy shape. So why is Mimosa shy? Here are the reasons why Mimosa is shy, which I brought to you for your reference.
So why is Mimosa shy?
1) biological adaptability, in order to avoid natural disasters
Mimosa grassland is produced in tropical South America, where there is plenty of rainfall. Whenever the rain washes, its leaves will quickly close and its petioles will sag to avoid the damage of the rain. In addition, when natural creatures touch it, Mimosa will make the same response, causing a certain deterrent to other creatures.
2) biological perceptual movement
There is another saying about why Mimosa is shy, biological perceptual movement. Mimosa cells are supported by tiny reticular proteins. When Mimosa is touched, the phosphoric acid in this reticular protein will fall off, the permeability of the cells in the lower part of the leaf pillow will increase, and the water and solute will be penetrated from the vacuole and discharged into the cell space, so that the surrounding tissues will shrink, the ready-made leaves will be closed, and the petiole will droop (shy).
Why is Mimosa shy
I remember when I was very young, my mother bought me a pot of Mimosa in the flower and bird market. Because it is different from the previous flowers and plants, I am very curious, so I often pay attention to it and observe it.
In spring, Mimosa sprouted, showing a small green head, but only about 10 cm to 20 cm; In April, Mimosa has stretched out its small arms, like a step-by-step ladder, neatly arranged on both sides of the pole; In May, the small arm of Mimosa becomes thicker and bigger, which looks like a fan from a distance. Once, when watering it, I accidentally touched the leaves of Mimosa. It shrank like a shy little girl.
In summer, the color of Mimosa leaves becomes darker and the leaves become more lush. What is exciting is that Mimosa has blossomed. The flowers are pink, spherical and light, like small thorn balls. At first glance, they look like purple Flammulina velutipes. They are particularly cute!
In autumn, Mimosa gives birth to babies. The shape of the small pod is very similar to that of the soybean pod, but the size is much smaller, and there are hairy thorns on the edge of the small pod. The pod is green at first and turns yellow when it is mature. After picking it and opening it, there lies a small brown yellow convex round bean with a small head but a hard body.
In winter, our Mimosa got sick because it was not shy. In the evening, my father told me that Mimosa had small petioles, large petioles and compound petioles. The place where the shame axis was connected was called petiole. There is water in the cells inside the petiole. When we touch the leaves, the water in the cells inside the petiole will run into the gaps of other cells, and the upper part of the petiole will fold. Therefore, Mimosa will be shy. However, if we touch it continuously, the cell fluid in its petiole will flow away, and if we touch it again before it is replenished, there will be no shame.
Do you know why Mimosa is shy? I checked the computer to know: originally, at the base of its petiole, there is an expanded organ called leaf pillow. There are many parenchyma cells in the leaf pillow, which are very sensitive to external stimuli. Once the leaf is touched, the stimulation is immediately transmitted to the leaf pillow. At this time, the cell fluid in the parenchyma cells begins to flow to the cell gap, which reduces the expansion ability of the cells, and the pressure between the cells in the lower part of the leaf pillow decreases, resulting in the phenomenon of leaf closure and petiole drooping. After 1-2 minutes, the cell fluid gradually flows back to the leaf pillow, so the leaves return to their original appearance. The above phenomenon of Mimosa leaves is not only a physiological phenomenon, but also the result of mimosa's long-term adaptation to the external environment in the process of phylogeny. The leaves of the Savannah are gradually closed by the storm, which protects the Savannah from the storm.