Middle lamella

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Cell wall and middle lamella (top)

The middle lamella is a pectin layer which cements the cell walls of two adjoining plant cells together. It is the first formed layer which is deposited at the time of cytokinesis.[1] The cell plate that is formed during cell division itself develops into middle lamella or lamellum. The middle lamella is made up of calcium and magnesium pectates.[2] In a mature plant cell it is outermost layer of cell wall.[3][4]

In plants, the pectins form a unified and continuous layer between adjacent cells. Frequently, it is difficult to distinguish the middle lamella from the primary wall, especially in cells that develop thick secondary walls. In such cases, the two adjacent primary walls and the middle lamella, and perhaps the first layer of the secondary wall of each cell, may be called a compound middle lamella. When the middle lamella is degraded by enzymes, as happens during fruit ripening, the adjacent cells will separate.[5]

Placement of middle lamella in plant-tissue (highly diagrammatic)

See also[edit]

References[edit]

  1. ^ Sofradžija A., Šoljan D., Hadžiselimović R. (2007). Biologija 1. Svjetlost, Sarajevo. ISBN 9958-10-686-8. 
  2. ^ "Cell Organelles". A-level revision guide. S-cool. Retrieved 21 January 2013. 
  3. ^ Alberts B.; et al. (2002). Molecular Biology of the Cell, 4th Ed. Garland Science. ISBN 0-8153-4072-9. 
  4. ^ King R. C., Stransfield W. D. (1998). Dictionary of genetics. New York, Oxford: Oxford University Press. ISBN 0-19-50944-1-7. 
  5. ^ Raven P. H., Johnson G. B. (2001): Biology. McGraw-Hill Science/Engineering, New York, ISBN 9780073031200.

2.Telugu Akademi Hyderabad "Intermediate first year Botany"