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Chapter 7: Roots (Other Types of Roots and Root Modification (roots of…
Chapter 7: Roots
Other Types of Roots and Root Modification
storage roots
stores carbohydrates
root nodules and nitrogen fixation
infection thread
Rhizobium
prop roots
stabilizers
buttress roots
haustorial roots of parasitic flowering plants
haustoria
penetration through dermis
Tristerix
aerial roots of orchids
epiphytic
dangle freely in air
velamen
roots of strangler figs
genus
Ficus
hugs host tree
host tree dies
self-supporting tree
contractile roots
Oxalis
Gladiolus
Crinum
mycorrhizae
ectomycorrhizal relationship
penetrate outermost cortex cells
endomycorrhizal association
hyphae penetrate the root cortex
Origin and Developmental of Lateral Roots
Initiated by cell division
more densely cytoplasmic
small root primordium
forms root cap
forms first protoxylem
Internal Structure of Roots
root cap
zone of maturation/root hair zone
endodermis
Casparian strips
pericycle
root apical meristem
quiescent center
mature portions of the root
passage cells
root pressure
zone of elongation
Concepts
taproots
3 functions
anchoring plants
absorbing water and minerals
producing hormones
External Structure of Roots
Organization of Roots Systems
lateral roots (branch roots)
radicle
fibrous root system
adventitious roots
Structure of Individual Roots
root cap
mucigel
zone of elongation
root hair system
root hairs
