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Roots (Other types of roots and root modifications (Haustorial roots of…
Roots
Other types of roots and root modifications
Storage roots
Store carbohydrates from summer photosynthesis
Prop roots
Transport additional nutrients and water to the stem
Aerial roots of orchids
Live attached to branches of trees
Contractile roots
Uppermost portions slowly contract
Mycorrhizae
Symbiotic relationship with soil fungi
Root nodules and nitrogen fixation
Relationship with nitrogen -fixing bacteria
Haustorial roots of parasitic flowering plants
Highly modified roots
Grow around small branch of host
Roots of strangler figs
Birds eat seeds, deposit on other trees, grow rapidly downward
Internal Structure of roots
Root cap
Protection for apical meristem
Root apical meristem
Growth
Zone of elongation
Where Cells expand greatly
Zone of maturation/root hair stem
Root hairs grow
Thin cuticle appears
Mature portions of the root
External Structure of roots
Organization of root systems
Lateral roots
Branch roots
Embryonic root=radicle
Fiberous root system
Adventitious roots
Structure of individual roots
Simple
Root tip
Root cap = protection
Origin and development of lateral roots
Initiated by cell divisions in pericycle
