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How does the middle lamella hold neighboring plant cells together?
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Cell wall
Cutaway drawing of a plant cell, showing the cell wall and internal organelles.
The middle lamella functions as a cementing layer that binds the primary cell walls of adjacent plant cells together. This adhesion is primarily facilitated by pectin, a group of water-soluble carbohydrate substances found within the intercellular tissues.12
By forming a gel-like substance between cells, pectin acts as a structural glue that helps plant tissues maintain their firmness and shape. The importance of this role is evident in the ripening process of fruits: as protopectin is converted into pectin, it keeps cell walls joined, but as the fruit becomes overripe and the pectin breaks down into simple sugars, the tissue loses its structural integrity and softens.2