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Lecture 4: Root System (Dicot root (Vascular tissue (Conducting tissue in…
Lecture 4: Root System
Root system
Structure and growth habits of roots affects the size and vigor of the plant, method of propagation, adaptation to certain soil types, and response to cultural practices and irrigation.
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Root Cap
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Protects the delicate meristematic tissues behind from damage as the young root pushes through abrasive soil particles
Zone of elongation
Cells increase in size through food and water absorption, allowing root to push through the soil
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Zone of maturation
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May give rise to root hairs: Help absorption of water by increasing total surface area and also to help adhere tightly to soil particle
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Characteristics
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Central xylem and phloem is surrounded by an endodermis and the entire central structure is called a stele
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Endodermis
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Side walls thickened with suberin, called as casparian strips #
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Casparian strips
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Forces all water and dissolved substances entering or leaving the central core of tissues to pass through the plasma membrane of the endodermal cells/ their plasmodesmata
Regulates the type of minerals absorbed and transported by the roots to the stems and leaves. (Plasma membranes tend to exclude harmful minerals and retaining useful ones
Pericycle
A layer of thick-walled, tightly packed cells without intercellular spaces behind the endodermis directly
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No central solid cylinder of vascular tissue (Phloem and xylem are separate alternating strands arranged in a circle around the pith)
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