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14 Cards in this Set
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- Back
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Taproot Systerm
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1 or 2 dominant primary roots and secondary (lateral) roots; Deep into soil profile
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Fibrous Root System
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Thin
• Profusely branched • Many principal roots which appear to be equivalent • Often near soil surface |
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Functions of Root System
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1. Anchor plant
2. Store food 3. Absorb water and nutrients |
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Tissue Systems of Roots
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Dermal; Ground; Vascular
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Dermal Root Tissue
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covers the outer surface of herbaceous plants epidermis
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Ground Root Tissue
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comprises the bulk of the primary plant body; cortex
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Vascular Root Tissue
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transports materials within the plant (water,
carbohydrates, etc.); xylem/phloem |
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Root Hairs
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• Increase surface area of root
• Extension of epidermal cells • Responsible for water and nutrient absorption |
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Cortex (root)
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1. Parenchyma cells store food in amyloplasts (starch storage organelle)
2. Acts as filter for water and nutrients 3. Located between epidermis and vascular cylinder |
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Endodermis
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1. Innermost cell layer of cortex
2. Regulates water and nutrient flow into vascular cylinder 3. Cell walls impregnated with suberin and lignin – forcing substances to be actively transported through cells |
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Pericycle
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• 1 or 2 cells thick
• Area of cell division to produce lateral roots |
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Cambium
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• Between xylem and phloem
• 1 or 2 cells thick • Lateral meristem |
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Symplastic Transport
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allows the plant to selectively take up nutrients and other materials
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Aerial Roots
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Adventitious roots on plants growing in unstable rooting
environments e.g. marshes, mud flats |
