Roots213-page2 - • Taproots are often deep and provide...

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Roots - 2 There are two major root systems (plus adventitious roots) that differ in the structure and number of roots. When a seed germinates, the primary root, or radicle as it is called in the embryo, emerges from the seed coat. That primary root may develop into a taproot or die and be replaced by a system of fibrous roots. In addition, adventitious roots arise from stem or leaf cuttings. Root Systems Taproot system The taproot system develops from the primary root. It is comprised of one major root that is thicker at its base (junction with the stem) and tapers toward the growing tip. Taproot systems are found in many eudicots and gymnosperms. Taproots are: Deep penetrating in soil Often used for food storage Form small lateral roots from the tap root
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Unformatted text preview: • Taproots are often deep and provide excellent anchorage for the plant Tap root system Fibrous root system Adventitious roots Fibrous root system Many, if not all fibrous root systems develop from small adventitious roots that develop from stem tissue soon after germination, particularly in monocots. The primary root is short-lived. (Recall that adventitious structures are structures that develop from other than apical meristem) Fibrous roots are: • Shallow, wide spreading • Several, equal diameter rots or root masses • Good for soil erosion control. Fibrous roots cling to soil particles well. • Fibrous roots are found in many different kinds of plants....
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