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Plant Organs: Roots
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Funciton of roots
–
Anchorage
–
Absorption of water and minerals from soil (assisted by root hairs)
–
Food storage in some
Types of roots
–
Fibrous- no main root, highly branched
–
Taproot- one main root with many small branches
Roots endodermis
•
Endodermis --- the innermost cortex layer
–
Specialized
parenchymal
cells whose lateral and tangential walls are embedded with suberin (
Casparian
strip)
–
Force water and minerals to enter cells , because the
casparian
strip inhibits movement between cells or in cell walls
Roots pericycle
•
Pericycle
–
Gives rise to branch roots
Herbaceous Dicot Roots Order
•
Epidermis with root hairs, no cuticle
•
Cortex
•
Endodermis with
Casparian
strip
•
Vascular Cylinder (= Stele)
Herbaceous Dicot Roots Vascular Cylinder= stele
–
Pericycle
–
Xylem arranged in geometric array (star or cross) in center of root
–
Phloem wedges on outside of xylem in between xylem arms
–
No pith
Woody Dicot Roots
FUnction
•
Functions in support & anchorage, not absorption
Woody dicot roots dermal and vascular tissue
•
Periderm
(replaces epidermis)
–
Cork and cork cambium
•
Vascular Cambium produces secondary xylem toward the inside and secondary phloem toward outside
Monocot Roots order
•
Epidermis with root hairs; no cuticle
•
Cortex-
collenchyma
and parenchyma
•
Endodermis with
Casparian
Strip
•
Pericycle
–
Outermost layer of stele
–
lateral
meristem
- gives rise to lateral roots
•
Vascular Stele
–
Xylem arranged in circular fashion with patches of phloem between
Pith
Author
DesLee26
ID
204443
Card Set
Plant Organs: Roots
Description
Plant Organs
Updated
2013-03-02T17:45:03Z
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