Chapter 8
Vascular Cambium
Outer Bark
Secondary Growth in Roots
Anomalous Forms of Growth
The vascular Cambium is one of the meristems that produce the secondary plant body.
In a herbaceous species, the cells located between the metaxylem and metaphloem of a vascular bundle ultimately stop dividing and differentiate into conducting tissue
Vascular Cambia must be extended each year
When cells come out of cell cycle arrest and resume mitosis that forms an interfascicular cambium Picture of an Interfassicular Cambium being formed
Fusiform Initials are long, tapered cells
Regions with strong seasoned climates have a inactive vascular cambium during times of stress
Reaction Wood
Reaction Wood develops mostly on the upperside of the branch
Tension Wood Also Called Reaction Wood
Cork and The Cork Cambium
The younger, innermost cells, once matured form a large diameter of the stem or root
Cork Cambium
Phellogen Same Thing
Tissue that gives rise to the cork
Outer cell is the cork cell
Phellem Cell Another Name
Mature Layer of parenchyma is the Phelloderm
Tissue outside the cork cambium is the outer bark
Tissues on the inside between the cork cambium and vascular cambium is the inner bark
Some trees and roots have secondary growth
Ray and fusiform initials are located in the Root Vascular Cambium
There are many ways in which a root can store things
Sweet Potatoes
Parenchyma storage is increased by a very large amount because of secondary growth
Unique Activity of the Vascular Cambium
Activity among the Vascular Cambium can very depending on species
Secondary Growth in Monocots
Some parenchyma cells undergo very fast division and make new narrow cells that break into secondary vascular bundles
Shoots and Roots of plants that are woody become longer because of new cells being added