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Structure of Woody Plants (Vascular Cambium (Arrangement of Cambium Cells,…
Structure of Woody Plants
Vascular Cambium
Cells between Metaxylum and Metaphloem
Initiation of Vascular Cambium
Cells develop to become secondary Xylem and Phleom
Produces Secondary plant body
Arrangement of Cambium Cells
Fusiform Initials
Regular Horizontal rows
Long tapered Cells
Thin primary wall present
Rays initials
Short, more cuboidal cells
Shortt, vertical rows
Create Storage Parenchyma
In wood plants never mature they continue to divide
Wood in 3 Dimension
Desert Trees
Abundant Xylem Parenchyma
Little water reserve
Waxy Leaves assist in water retention
Axial System
Fibers for strength and flexibility
Vessel elements that carry water
Hardwoods
Wood of basal angiosperms
Fibers present
Softwoods
Woods from Conifers (Pines, Redwoods,etc)
No fibers
Normally harder than Hardwoods
Radial System
Simple, contains only Parenchyma
Ray Parenchyma
Stores carbohydrates and the nutrients
Upright Cells
Procumbent Cells
Growth Rings
Late Wood
Less transpiration
Early Wood
High proportions of wide vessels
Annual Rings
Early + Late wood, One a year
Outer Bark
Tissue outside innermost cork cambium
Oxygen Diffusion
Intercellular space creates diffusion pathway for Oxygen
Initiation of cork cambia
Can be initiated before twig or root is one
can be delayed if plant is depended on cortex chlorenchyma for photosynthesis
Ex: Cactus
Secondary growth in Roots
Contain ray and fusiform initials
Roots don't store water, Stems do
Anomalous Secondary Growth
Roots of Sweet Potatoes (Ipomoea Batatas)
Increased Parenchyma
Numerous vascular cambia
Unusual primary growth
Palm Trees
Trunk doesn't taper
No true wood
No vascular cambia or secondary phleom
