Apical Meristems of stem and root,Stem apex,Root apex,Plumular end of Embryonal Axis,Procambium,Dermatogen or Periblem, Calyptrogen

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Apical Meristems of stem and root

1. Stem apex
It is dome shaped zone formed either at plumular end of embryonal axis or in axil of a leaf

Outlines Showing Major Regions
1. Leaf Premordium
2. Promeristem
3. Two Layered Tunica
4. Corpus
5. Initial Layer of Corpus
6. Peripheral Region
7. RIB Meristem

Cellular Details
1. Leaf Primordium
2. Initial Layer of Corpus
3. Two Layered Tunica
4. Promeristem
5. Corpus

It is always covered by young from its sides. It has two zones¾the outer single layered¾ TUNCIA and the inner mass ¾CORPUS (by Schmidt). Cells of tuncia divide anticlinally giving rise to dermatogen or periblem. The cells of corpus divide in all directions to form periblem or ground meristem and plerome or Procambium which later form ground tissue system and vascular tissue system respectively.

2. Root apex

L.S Root Apex

A. Root Hair Appears	H. First Sieve Element Begins to Differentiate
B. Edodermal Cells Differentiate	I. Maximum Rate of Cell Division
C. Elongation Ceases	J. Root Cap
D. First Vessel Element Begins to Differentiate	K. Vessel Element in Mature
E. Maximum Rate of Cell Elongation	L. Region of Elongation
F. First Sieve Tube matures	M. Meristem
G. Cell Division Ceases in Most Cell Layers

Apical meristems in roots are derived from a group of apical initial or promeristems. They divide to form three regions¾dermatogen, periblem, plerome. They give rise to same tissues as in stem. But at the end of root apex the dermatogen produces a few celled tissue¾calyptrogen. It is meristematic and give rise to rootcap. A small region at the centre of root apex show very low mitotic activity called quiescent centre ¾where the level and protein synthesis are low (by Clowes).

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Anatomy of Flowering Plants Tissue and Meristematic Tissue Classification of Meristematic Tissue Apical Meristems of Stem and Root Permanent Tissue Simple Permanent Tissue Complex Tissues - Xylem Types of Xylum Complex Tissues - Phloem Classification of Permanent Tissue on Basis of Their Functions Types of Vascular Bundles Anatomy of Monocot Stem - Maize, Primary Structure of Stem Anatomy of Dicotyledonous Stem - Sunflower Stem Secondary Growth in Dicot System Origin and Activity of Cambium Origin and Activity of Cork Cambium Heart Wood and Sap Wood Primary Structure of Monocot Root Primary Structure of Dicot Root Secondary Growth in Dicot Roots Origin and Activity of Vascular Cambium Origin and Activity of Cork Cambiums Internal Structure of Dicot Leaf Internal Structure of Xerophytic Leaf Internal Structure of Monocot Leaf - Isobilateral Leaf