what are casperian strips
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Casparian strip A band of suberin, an impermeable substance, found in the endodermal cell walls of plant roots; it was named after R. Caspary. Movement of water through the apoplast pathway is diverted from the cell wall to the cytoplasm, where it then follows the symplast pathway. The endodermal cells actively secrete salts into the vascular tissue. This results in a low (more negative) water potential, allowing water to move down a water potential gradient from the endodermis into the vascular tissue. The Casparian strip prevents water from returning to the cortex; consequently a positive hydrostatic pressure is established in the vascular tissue – the phenomenon of root pressure.
Casparian strip A band of suberin, an impermeable substance, found in the endodermal cell walls of plant roots; it was named after R. Caspary. Movement of water through the apoplast pathway is diverted from the cell wall to the cytoplasm, where it then follows the symplast pathway. The endodermal cells actively secrete salts into the vascular tissue. This results in a low (more negative) water potential, allowing water to move down a water potential gradient from the endodermis into the vascular tissue. The Casparian strip prevents water from returning to the cortex; consequently a positive hydrostatic pressure is established in the vascular tissue – the phenomenon of root pressure.
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In plant anatomy, the Casparian strip is a band of cell wall material deposited in the radial and transverse walls of the endodermis, and is chemically different from the rest of the cell wall - the cell wall being made of lignin and without suberin - whereas theCasparian strip is made of suberin and sometimes lignin.
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The Casparian strip in the root endodermis forms an apoplastic barrier between vascular tissues and outer ground tissues to enforce selective absorption of water and nutrients. Because of its cell-type specificity, the presence of a Casparian strip is used as a marker for a functional endodermis.
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