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Roots (Other types of roots and root modification (Prop roots (extensive…
Roots
Other types of roots and root modification
Storage roots
summer photosynthesis, stem dies in fall, new shoot in spring
Prop roots
extensive growth, transports addition nutrients, stablizers
Ariel roots of orchids
free hanging roots, grows on trees
Contractile roots
more contraction then prop roots
Mycorrhizae
endomycorrhizae
symbiosis
endomucorrhizal association
Root nodule and nitrogen fixation
bacterium receives sugar from the plant and the plant receives nitrogen from the bacterium
haustorial roots of parasitic flowering plants
paristic roots
Internal structures of roots
Zone of elongation
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expanded cells, pemeable tissue
root cap
specific structure and growth pattern
meristematic
Root aperical meristem
More orderly, central cells do not synthesize DNA
quiescent center
more resistant to harmful agents
Zone of Maturtion/Roothair
later roots, altered walls
root hairs grow outwards
Mature portions of the root
passage cells, watertight sheath, root pressure
External Root Structures
Individual Root Structures
Simple
zone of elongation
root cap
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mucigel, aperical meristem of root
Root hair zone
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organization of root system
one taproot
lots of smaller roots
radicle
embryonic root, start of taproot
lateral roots
fibrous root system
monocots and eudicots
transprt, absorption, doesn't grow from preexisting root
Origin and development of Lateral Roots
root primordium, few cells
