ROOTS

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ROOTS

• Functions
• anchorage
• absorption
• storage
• conduction

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Primary root
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Tap Root
Fibrous Roots
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Structure in Roots
Two arrangements

• Epidermis
• Ground tissue
• Vascular tissue

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Special root adaptations

• Aerial roots (adventitious)
• Storage roots
• Symbiotic roots

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The End
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Prop roots
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Vascular cylinder
Cortex
Velamen
Epiphytic plants
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Root hairs
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Epidermal extensions
Function?
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cortex
vascular cylinder
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The endodermis is the innermost layer of the
cortex
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Casparian strip
Endodermis
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Endodermis controls movement of substances into
the vascular system
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Casparian strip
Pericycle
Endodermis
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Branch roots initiate in the pericycle
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Eudicots
epidermis
cortex
pith
vascular tissue
Monocots
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Casparian strip
Pericycle
Endodermis
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• Mycorrhizal Roots
• endo and ecto
• phosphorus nutrition

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Root nodules

• Symbiotic bacteria
• Provide nitrogen to legumes