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Ch 8 Structure of Woody Plants (Vascular Cambium (Arrangement of Cambium…
Ch 8 Structure of Woody Plants
Vascular Cambium
Initiation of the Vascular Cambium
Vascular Cambium
Produces Secondary Plant body
Ray Initials
Short/ square cells
Storage parenchyma
Gymnosperms
albuminous cells
Arrangement of Cambium Cells
Ray Initials
Grouped in short vertical rows
Fusiform initials
Horizontal Rows
Vascular Cambium
Plant may just have 1
Fusiform Initials
Long Tapered Cells
Division
Periclinal Wall
Parallel Wall
Anticlinal Wall
Perpendicular to cambiums surface
Secondary Xylem
Types of Wood Cells
Contains
Vessel Elements
FIbers
Sclereids
Parenchyma
Trachieds
Arrangement of Secondary Xylem
Axial system
Fusiform Initials
Radial System
Ray Initials
Growth Rings
Wood Type
Early Wood
Wide vessels
Late Wood
Both woods make annual ring
Heartwood and Sapwood
Heartwood
Dark wood/ Center
Sapwood
Outer wood/ lightly colored
Reaction Wood
Produced from stress
Secondary Phloem
Has axial + radial system
Axial system
Responsible conduction up + down
Outer Bark
Cork and Cork Cambium
Cork cambium= phellogen
Lenticels and Oxygen Diffusion
Lenticels
regions of aerenchymatous cork
Initiation of Cork Cambium
highly variable
Secondary Growth in Roots
trees that undergo this
conifers
woody angiosperms
Anomalous Forms of Growth
Anomalous Secondary Growth
alternative cambia produce secondary bodies that differ
Sweet potatoes
Unequal Activity of the Vascular Cambuim
Included Phloem
Unusual Primary Growth
Division
