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Roots (Other types of roots and root modifications (Prop roots (extend…
Roots
Other types of roots and root modifications
Contractile roots
shorten and expand radially
Storage roots
long term storage
carbohydrates
produce new shoot in spring
Prop roots
extend into soil
transfer water and nutrients to tree
sometimes grows through air
Roots of stangler figs
grow as epiphytes
birds eat fruits of strangler figs
drop seeds on other branches
roots cling to bark of host tree
Internal structure of roots
Root cap
undergo cell division
layer of cells closest to root meristem
meristematic
Zone of maturation
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root hairs grow outward
increase absortption of water and minerals
merges with zone of elongation
Zone of elongation
behind root apical meristem
cells are divided and expanded
External structure of roots
Organization of root systems
lateral roots
comes out of taproot
develops from embryonic root
called radicle
fibrous root system
come from radicle
producing root primordia
adventitious roots
increase absorption and transport capacities
Structure of individual roots
root cap
thick layer of cells
provides protection
mucigel
complex polysaccharide
lubricates passage of root
causes soil to release nutrients
root hair zone
many epidermal cells
extend out as narrow trichomes
root hairs
form only in root that is not elongating
