Why does mimosa shrink (why does mimosa fold when touched?)
The leaves of mimosa will close after being touched, which is what organisms can do to the outside world stress response.
Mimosa
Mimosa is different from other plants. Its cell-friendly resource *** is supported by the tiny reticular protein “actin” (occipital-sensitive contraction). When the closing movement occurs, the phosphates of actin are shed, and as long as the mimosa absorbs the compound that does not shed the phosphates, the tactile sensation is unchanged. When the actin bundles are scattered, the cells are destroyed, and as a result, water runs out, resulting in closed movement. Actin is generally found in animal muscle fibers and is involved in muscle contraction. Its excellent resource *** is quite rare in mimosa.
If you touch the leaves of the mimosa, they will close immediately. The harder the contact, the faster they close. The whole leaf will hang down, like fainting, and the whole action is completed in a few seconds. The leaves and petioles of mimosa have special structures. At the petiole and leaflet base of compound leaves, there is a relatively enlarged part called leaf pillow. The occipital lobe is the most sensitive to hormones. As soon as it touches a leaf, the fungus spreads immediately to the pillow at the base of the petiole. The two small leaves are closed together, and the impact force is greater, not only affecting the occipital part of the leaflet, but also quickly affecting the occipital part of the base of the petiole, and the entire petiole droops. This is because there is a large vascular bundle in the center of the occipital lobe, which is surrounded by parenchyma with many intercellular spaces. When the vibration is transmitted to the occipital, the cell fluid in the parenchyma cells in the upper part of the occipital is discharged into the intercellular space, reducing the turgor pressure in the upper part of the occipital, while the parenchyma cells in the lower part still maintain the original turgor pressure. The result is that the small leaves stand upright, two small leaves close together, and even the whole leaf hangs down. Studies have shown that the leaves of mimosa will close within 0.08 seconds after being irritated. *** The post-conduction speed is also very fast, up to 10cm per second. *** After that, after a short while, everything slowly returned to normal, the leaflets began to unfold again, and the petioles also stood up. Recovery time is usually about five to ten minutes. If we continue to tease and massage its leaves one by one, it will get “bored” and no longer respond. This is because continuous stimulation causes the cell fluid in the occipital lobe cells to lose and cannot be replenished in time.