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Structure of Woody Plants (Vascular Cambium (Inititation of a Vascular…
Structure of Woody Plants
Vascular Cambium
Inititation of a Vascular Cambium
vascular cambium
fascicular cambium
interfascicular cambium
fusiform initials and ray initials
Fusiform Initials
periclinal walls
anticlinal walls
Ray Initials
short and cuboidal
Arrangement of Cambial Cells
#
storied cambium
nonstoried cambium
Secondary Xylem
Types of Wood Cells
axial system
derived from fusiform initials
radial system
develops from ray initailas
hardwoods
all basal angiosperms and eudicots
softwoods
from conifers
Growth Rings
late wood
when lots of new vessels are conducting rapidly
annual ring/growth ring
1 year of growth
diffuse porous
vessels located throughout
ring porous
vessels restricted to early wood
early wood
first wood formed
Heartwood and Sapwood
heartwood
center of log darker and more fragrant wood
sapwood
moister outer region
tylosis
plug in vessels
Reaction Wood
known as tension wood
Outer Bank
Cork and the Cork Cambium
Phellogen
Cork cell(phellem cell)
Phelloderm
Periderm
Inner and outer bark
Lenticels and Oxygen Diffusion
lenticels
regions of aerenchymatous cork
Initiation of Cork Cambia
detectable as plant surface changes colors from green to tan
Secondary Phloem
axial system
#
conduction up and down the stem or root
radial system
Anomalous Forms of Growth
Anomalous Secondary Growth
roots of sweet potatoes
increased number of storage parenchyma
included phloem
#
located b/w two bands of xylem
unequal activity of the vascular cambium
creates vines with advantageous flexibility
secondary growth in monocots
secondary vascular bundles
Unusual Primary Growth
establishment growth
meristem that produces secondary plant body
Example: palm trees
