Transcript roots[1]

rye
A young root –the first organ to emerge during seed
germination---WHY?
Adventitious roots
Root tip
root hairs
Slimy layer
Root apical meristem
rootcap
cortex
epidermis
Cross section of primary root
endodermis
Vascular cylinder
stele
cortex
epidermis
Cross section of primary root
endodermis
Vascular cylinder
stele
pericycle
Primary xylem
Primary phloem
xylem
Cross section of primary root
Stele:
Dicot root
cross section
A = xylem
B = phloem
C = endodermis
D = pericycle
Zea sp. root cross section
storage
Pneumatophores -- for
breathing in waterlogged
soil
Contractile roots -thickened specialized roots
at the base of a corm, bulb,
or other organ which is
designed to shrink
vertically under conditions
of seasonal drought that
helps position this plant
part at an appropriate level
in the ground.
Haustoria –
suckers of
parasitic plants
for obtaining
nutrients from
their hosts
Mycorrhizae –mutualistic
relationship between plant
roots and fungi
Pinus strobus with
Amanita muscaria
Root nodules --–mutualistic
relationship between plant
roots and N-fixing bacteria