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ROOT SYSTEMS. ROOT ORGANIZATION. Roots systems are usually either: Tap root (dicots) or Fibrous root (monocots) some plants may have both; e.g. clover. Root Anatomy (Macro). Root hairs - major site of water/nutrient absorption - located in zone of cell maturation
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ROOT ORGANIZATION Roots systems are usually either: Tap root (dicots) or Fibrous root (monocots) some plants may have both; e.g. clover
Root Anatomy (Macro) Root hairs - major site of water/nutrient absorption - located in zone of cell maturation Lateral (secondary roots) - form near but behind root hair zone - from cells of pericycle; meristematic - forms apex; pushes through endodermis, cortex, epidermis
ROOT FUNCTIONS Roots: Anchor Absorb Conduct Store
ROOT FEATURES Root Cap – covers root apex protects and lubricates secretes mucigel mucigel also aids water and nutrient absorption
Root Hairs – increase absorption develop in region of maturation extensions of epidermal cells
Primary Root – develops from radicle (embryonic root) of germinating seed . . . branches into: Branch (secondary) Roots – develop from the pericycle of the central root
Adventitious Roots Latin adventicius “not belonging to” arise from stems or leaves e.g. brace roots of corn ornamentals often propagated
Taproot – primary root persists and maintains dominance e.g. alfalfa, cotton, pecan often storage/food source e.g. carrot, beet, turnip
Contrast Taproot w/ Fibrous Root Refer to notes
Root Morphology Four Functional Zones: - region of maturation - region of elongation - meristematic region - root cap