Please enable JavaScript.
Coggle requires JavaScript to display documents.
structure of woody plants (anomalous growth in roots (included phloem…
structure of woody plants
concepts
secondary tissues
bark
wood
primary tissues
cortex
vascular bundles
epidermis
leaves
pith
outer bark
cork and cork cambiium
lenticels and O2 diffusion
lenticels
permits O2 to penetrate bark
secondary phloem
phellogen aka cork cambium
cuboidal cells
after division inner cell remains cork cambium
phelloderm
layer of parenchyma
outer cell differentiates into cork cell
periderm
layers of cork cells
phelloderm
cork cambium
vascular cambium
meristems that produce secondary plant body
interfascicular cambium
fascicular cambium
continue to divide instead of maturing
two kinds of cells
ray initials
#
undergo periclinal divsion
produce short cells
storage parenchyma
gymnosperms
albuminous cells
short and cuboidal
fusiform initials
long tapered cells
anticlinal walls
perpendicular to cambium
w/o cambial cells would be stretched and become non functional
periclinal wall
parallel to cambium
produced elongated cells of wood
phloem
seive cells
sieve tube members
companion cells
fibers
xylem
vessel elements
fibers
tracheids
arrangement of cambial cells
nonstoried cambium
without horizontal pattern
storied cambium
few advanced eudicot species
horizontal rows
secondary xylem
types of wood cells
axial system
#
contains tracheary elements
could contain fibers
flexibility
strength
conduction up/down stem/root
radial system
rays
store nutrients during dormancy
conduct material over short distances radially
two kinds
procumbent cells
upright cells
contains only parenchyma
hardwoods
lots of fibers
all basal angiosperms
all eudicots
soft woods
few or no fibers
growth rings
early wood
first wood formed
also called spring wlls
high proportion of wide vessels or tracheids
late wood
also called summer wood
can have a lower proportion of vessels
made once cuticle thickens and transpiration is less
more fibers
annual ring/ growth ring
early and late wood
ring porous
vessels in early wood
diffuse porous
vessels throughout the year
heartwood and sapwood
different regions because water columns break
freezing
winds
insects
tylosis
bubbles of protoplasm into vessel
forms plug in vessel
sapwood
lighter moister outer region
new layer formed each year
heartwood
dark center of log
dryer more fragrant
one annual ring
secondary phloem
radial system
ray initials
phloem rays
storage
only parenchyma cells
axial system
sieve tube members
companion cells
sieve cells
nonconducting parenchyma
fibers
anomalous growth in roots
anomalous secondary growth
roots of sweet potatoes
numerous vascular cambia arise
around individual
few sieve tubes
some vessels
large
storage of parenchyma increased
included phloem
located between two bands of xylem
protection from insects
new vascular cambium arises
unequal activity of vascular cambium
2 sectors completely active
2 sectors almost completely inactive
stem grows outward in 2 directions
secondary growth in monocots
some become tree-like and woody
dragon trees
palms
joshua trees
secondary vascular bundles
thick secondary walls
develop into fibers
unusual primary growth
palm trees
trunks do not taper at tips
do not branch
all primary tissue
ground tissue
vasular bundles
derived from shoot apical meristem
primary xylem
primary phloem
derive from
#
#
#
#
