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Roots (Other Types of Roots and Root Modifications (Root Nodules and…
Roots
External Structure of Roots
Organization of Root Systems
Taproot with lateral roots
Radicle= embryonic root
Fibrous root system
adventitious roots
increase absorptive and transport capacities of root system
Structure of Individual Roots
Root cap
protects root apical meristem
Mucigel
complex polysaccharide secreted by root cap cells
Zone of elongation
behind root cap where division happens
root hair zone
where epidermal cells extend
root hairs
only where root is not elongating
Internal Structure of Roots
Root cap
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to remain in place and provide protection for root apical meristem
Root Apical Meristem
Quiescent Center
mitotically inactive central region
Zone of Elongation
behind root apical meristem
where cells expand
cells are enlarging
Zone of Maturation/Root Hair Zone
endodermis
tangential walls
Casparian strips
bands of altered walls
Mature Portions of the Root
Other Types of Roots and Root Modifications
Storage Roots
long term storage for carbs
Prop Roots
do not make contact with the soil
Aerial Roots of Orchids
Contractile Roots
Mycorrhizae
endomycorrhizal association
ectomycorrhizal relationship
Root Nodules and Nitrogen Fixation
Nitrogen fixation
Infection thread
Root nodule
Haustorial Roots of Parasitic Flowering Plants
Roots of Strangler Figs
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cling to bark of host tree branches
Origin and Development of Lateral Roots
Lateral Roots
Initiated deep w/I root
formed in mature region of root
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never develop in to flowers
