Mimosa pudica
( one of the top ten amazing plants)
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Makahiya
is the vernacular name also called the sensitive plants.The scientific name is
Mimosa pudica,comes from latin word pudica which means "shy".Mimosa
pudica is creeping annual or perennial herb often grow for curiosity value.The
species is native in South and Central America but now apantropical weeds.
The leaves of Mimosa pudica are bipinnately compound
with one or two pinnae pairs and 10-26 leaflets per pinna. The compound leaves
fold inward and droops when touch and reopen minutes later.It is also closed
under various other stimuli, such as warming, blowing or shaking.These types of
movements have been termed seistomastic movements,the movement that occurs when
specific regions of cells lose turgor pressure.
When the plant is being disturbed specific
regions on the stems are stimulated to release chemicals including potassium
ions which force water out of the cell vacuoles and the water diffuses out of
the cell, producing a lost of cell pressure and cell collapse of the leaf
petioles.This characteristics is quite common within the Mimosedeae , subfamily
of the legume family,Fabaceae. The stimulus can also be transmitted to
neighboring leaves but it is not known exactly why Mimosa pudica evolved this
trait.Many scientists think that the plant uses its ability to shrink as
defense from predators.May be animals are afraid to fast moving plant and would
rather eat a less active one.Another possible explanation is that the sudden
movement dislodges harmful insects.