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Depressions in secondary cell wall is called pit.
A pit present on the free cell wall surface without its partner is called
It consists of 2 parts -
Pit chamber and Pit membrane.
Pit chamber / pit cavity is depression in wall where secondary wall is absent.
Opening of pit chamber into cell is called pit pore / aperture.
Pit membrane is formed of (PCW + middle lamella + PCW) it is "trilaminar".
Pit membrane also called closing membrane.
Pit membrane is permeable due to permeability of primary cell wall.
Pits are of 2 types (depending upon the shape of the pit chamber.)
(i) Simple pit
Pit chamber has uniform width.
Diameter of lumen remains the same.
Found in vessels, tracheids & sclerenchyma.
(ii) Bordered pit
Pit chamber is flask-shaped.
Diameter of lumen is increases from inner to outer side.
A disc-shaped thickening called Torus is present in the middle of pit chamber on pit membrane.
It controls diffusion, it prevents rupturing of pit membrane when unequal pressure is present on its both sides.
Posted Date: 10/5/2012 6:03:42 AM | Location : United States
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