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Roots (others types of root and root modification (storage root…
Roots
others types of root and root modification
storage root
winterproof shoots
storage carbohydrate
stem dies back to few nodes
prop roots
extended soil
more vascular bundle
capable of expensive growth
aerial root of orchids
waterproof barrier
orchids are epiphytic
contractile roots
becoming firmly anchored
firmly mixed to the soil
roots have more contraction
mycorrhizae
grow apical meristem
have two types of relationship
ectomycorrhizal and endomycorrhizal association
haustorial roots of parasitic flowering plant
connect conductive plants
penetrate host plant
ability to extract water and nutrients
origin and development of lateral roots
arises from vascular cycliner
polyarch root
arises opposite of phloem
begins unequal
periclinal devision
internal structure of roots
root cap
tip of plant root
protects growing tips in plant
secretes mucilage
root apical
small region of tip
capable of repeated division
root apex is protected
mature portion of the root
begin the root
Zone of cellular maturation
apical meristem
ground meristem
procambium
protoderm
zone of elongation
located at newly zone cells
first root hair
zone of cell maturation
first centimeter of root tip
zone of maturation
numerous root hair
outgrowth of single epidermal cells
increase absorptive surface
water and nutrients needed
External structure of roots
organization of root system
Fibrous root
have to be meters long
absorption surface
highly branched
Adventitious root
single prominant taproot
structure of individual root
root tip
Simple structure
longitudinal growth
mugical
Function
causes soil to release nutrient ions
secreated by dictyosomes
complex polysaccharide
release nutrition
growth in length occurs
