Meristems-6  
311 Syllabus

Simplified Vascular Plant

A Quiescent Center occurs at the Apex of the Root & Shoot

These contain the "Initials"

Mitosis is rare

Both are capable of regenerating complete organs.

The Quiescent Centers are surrounded by a Peripheral Zone (PZ) of highly mitotic cells.

Various terms are applied to areas of the PZ that have distinctive division patterns (i.e. Rib Meristem).

A zone of Cell Elongation and a zone of Cell Differentiation occur basipetally (from the apex towards the base).

This produces the three Primary Tissues(Epidermis, Ground & Vascular).

Secondary Roots have an internal origin and appear in a sequential pattern.

The Shoot Apical Meristem produces Leaves and Secondary Shoots (Branches) superficially.

Leaves are formed near the Meristem Proper in a highly ordered manner.

Secondary Branches have a Superficial Origin where Leaves join the Stem

The specific location is called the Leaf Axil.

Consequently, these shoots are often called Axillary.

Shoot Apex of Coleus showing Leaf Primordia and Secondary Shoot Primordia in the Leaf Axils.	Shoot Apex of Lonicera showing well-developed Axillary Buds.