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
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
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
AbsorbConduct
Store
ROOT FEATURES
Root Cap –
covers root apexprotects and lubricatessecretes mucigel
mucigel also aids water and nutrient absorption
Root Hairs –increase absorptiondevelop in region of
maturationextensions 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 RootsLatin adventicius “not belonging to”
arise from stems or leavese.g. brace roots of corn
ornamentals often propagated
Taproot –primary rootpersists and maintains dominancee.g. alfalfa, cotton, pecanoften storage/food sourcee.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