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CH. 8 Structure of Woody Plants (Vascular Cambium (Fusiform Initials…
CH. 8 Structure of Woody Plants
Vascular Cambium
Initiation of the Vascular Cambium
vascular cambium
meristem produce second plant body
herbaceous species
cells located between
metaxylem/metaphloem
stop dividing
differentiate into conducting tissues
have matured
vascular cambium arises
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woody species
cells located in postion
never undergo cell cycle arrest
continue to divide
constitute fascicular cambium
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don't mature
interfasicular cambium
parenchyma cells
come out of cell cycle arrest
resume mitosis
Fusiform Initials
long, tapered cells
140-462 mm in dicots
700-8700 mm in conifers
longitudinal cell division
produces 2 elongate cells
one becomes fusiform initial
differentiates into cell of secondary xylem/phloem
Ray Initials
Arrangement of Cambial Cells
Secondary Xylem
Types of Wood Cells
Growth Rings
Heartwood & Sapwood
Reaction Wood
Outer Bark
Cork & Cork Cambium
Lenticels & Oxygen Diffusion
Initiation of Cork Cambia
Anomalous Forms of Growth
Anomalous Secondary Growth
Roots of Sweet Potatoes
storage of parenchyma increased
vascular cambia arise
Unusual Primary Growth
palm trees
trunks do not taper at tips
does not grow radially
is hard and woody
do not branch
all primary tissue
vascular bundles
contains primary xylem/phloem
derived from apical meristem
vascular cambium never develops
true wood doesn't occur
secondary phloem doesn't occur
seedling
no full set of leaves
wide trunk
becomes wider
leaves increases
produce adventitious roots
adds extra vascular bundles
establishment growth
form of primary growth
Secondary Phloem
connects