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Chapter 7 Roots (Types of Roots & Modifications (Carbohydrate Storage,…
Chapter 7 Roots
Types of Roots & Modifications
Carbohydrate Storage
Buttress Roots
Prop Roots
Aerial Roots
Mycorrhizae
Root Nodules & Nitrogen Fixation
Inner Structure of Roots
Zone of Elongation
Differentiation zone for vascular tissues
Zone of Maturation/ Root Hair Zone
Root hairs grow
Cortex
Vascular Bundles
Ground Tissue
Endoderm
Casparian Strips
Selectively permeable for certain minerals
Pericycle
Lateral roots synthesis
Root Apical Meristem
Quiescent Center
Reserve healthy cells
Normal proliferation
Mature Portions of the Root
Endodermis
Prevents excess root pressure
Root Cap
Center grow downward while edges grow upward
Root Functions
Hormone Production
Anchoring
Water Storage (Tap Roots)
Absorption
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New plant growth
External Structure of Roots
Structure of Individual Roots
Zone of Elongation
Length/Depth
Root Hair Zone
Don't begin until after ZoE due to potential destruction
Apical meristem
Growth
Lateral Roots
Root Cap
Protection
Organization of Root Systems
Lateral roots
smaller and more numerable
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Tap Root is larger than lateral roots
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developed from the embryonic root
Fibrous Root System
Consist of many non-derived roots
those are called adventitious roots
Origin and Development of Lateral Roots
Normally originates from the pericycle
destroys cortex and surrounding endoderm in growth
For more nutrients
Water Storage
Energy Molecules
