The type of movement in touch-me-not (Mimosa pudica) is a nastic movement. Precisely, it is Seismonasty.ie due to touch or shock stimulus.(also Thigmonasty)
At the bases of pinnules,pinna and whole leaf, a swollen structure called pulvinus is present.Drooping is due to the loss of turgidity of lower portion of pulvinus.
A stimulus on the plant in turn triggers an action potential.The action potential travels through the plant until it reaches a pulvinus.
The pulvinus is a motor structure consisting of a rod of sclerenchyma surrounded by collenchyma. In its extended position, the cells of the entire collenchyma are distended with water. On receiving the action potential signal, the cells in the lower half of the pulvinus respond by expelling potassium and chlorine ions and taking up of calcium ions. This results in an osmotic gradient that draws water out of the affected cells. The lower pulvinus cells temporarily shrink due to water loss. This forces the entire structure to curve down in the manner of a fan. In this contracted position, the pulvinus no longer functions as a support and the petiole droops.
How touch "me not plant" become wilt after touch what is ites sciencetific mechanism?
Mimosa Pudica has tiny water sacs full and stiffening the leaf stems. When touched, an electrical signal causes these sacs to empty and the leaf wilts.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment