root systems. root organization roots systems are usually either: tap root (dicots) or fibrous root...
DESCRIPTION
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, epidermisTRANSCRIPT
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ROOT SYSTEMS
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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
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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
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ROOT FUNCTIONS
Roots:Anchor
AbsorbConduct
Store
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ROOT FEATURES
Root Cap –
covers root apexprotects and lubricatessecretes mucigel
mucigel also aids water and nutrient absorption
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Root Hairs –increase absorptiondevelop in region of
maturationextensions of epidermal cells
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Primary Root –develops from radicle (embryonic root) of germinating seed . . .branches into:
Branch (secondary) Roots – develop from the pericycle of the central root
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Adventitious RootsLatin adventicius “not belonging to”
arise from stems or leavese.g. brace roots of corn
ornamentals often propagated
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Taproot –primary rootpersists and maintains dominancee.g. alfalfa, cotton, pecanoften storage/food sourcee.g. carrot, beet, turnip
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Contrast Taproot w/ Fibrous Root
Refer to notes
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Root Morphology
Four Functional Zones:- region of maturation- region of elongation- meristematic region- root cap