Mimosa touch on the fold, not because really shy, this is only a more image of the metaphor.In fact, when stimulated by the outside world, closing leaves is a way of self-protection, because the growth environment of its origin is very bad, only through this way to protect themselves.That mimosa in the end how to do self-protection, the secret is mainly in the mimosa petiole.
There is a special organ called "pulvinus" on the petiole of Mimosa pudica. There are many parenchyma cells growing in the pulvinus. These cells are very sensitive. As long as they are slightly stimulated by external vibration or touch, they will begin to have a closed response.
Then there is the mimosa's own physiological reaction.When the leaf is touched, the cell fluid contained in the parenchyma cells in the pulvinus will flow to other places, reducing cell swelling.In this way, the pressure of parenchyma cells will become smaller, and the phenomenon of leaf closure and petiole drooping will occur.
In addition, when the external light is relatively weak, the water supporting the leaf expansion in the Mimosa leaf pillow will flow to the gaps on both sides under the action of external force, which will also lead to the phenomenon of leaf closure.But this phenomenon will not last too long, about two minutes will be restored.
Mimosa leaves close at night.Because there is no light at night, mimosa needs the right temperature to spread its leaves and photosynthesize in the sun.But at night, the temperature is relatively low, and can not carry out photosynthesis, in order to keep warm, the leaves of Mimosa will close at night.
