Root cap - Lubricates the roots. Contains materials that...

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Root cap The root cap is a cup-shaped, loosely cemented mass of parenchyma cells that covers the tip of the  root. As cells are lost among the soil particles, new ones are added from the meristem behind the  cap. The cap is a unique feature of roots; the tip of the stem has no such structure. From its shape,  structure, and location, its primary function seems clear: It protects the cells under it from abrasion  and assists the root in penetrating the soil. Phenomenal numbers of cap cells are produced to  replace those worn off and lost as root tips push through the soil. The movement is assisted by a slimy substance,  mucigel , which is produced by cells of the root cap  and epidermis. The mucigel 
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Unformatted text preview: Lubricates the roots. Contains materials that are inhibitory to roots of other species. Influences ion uptake. Attracts beneficial soil microorganisms. Glues soil particles to the roots thereby improving the soil-plant contact and facilitating water movement from the soil into the plant. Protects the root cells from drying out. Root cap cells sense light in some as yet unexplained way and direct root growth away from light. The root cap also senses gravity to which roots respond by growing downward, bringing them into contact with the soil, the reservoir of nutrients and water used by plants. The root cap also responds to pressures exerted by the soil particles....
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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