Botany lecture notes

Apical Meristem in Shoot: Structure and Organization


Shoot Apical Meristem
Apical Organization of Shoot Meristem

Apical meristem

Ø  Apical meristem is a patch of meristematic tissue present in the apex (tips) of shoot and roots in plants.  

Shoot apex:

Ø  Shoot apex is the growing tip of the stem.

Ø  It is an undifferentiated region with meristematic cells.

Ø  From this region the plant growth proceeds.

Ø  The shoot apex also produces lateral organs such as leaves, branches and flowers.

Ø  Below the apical meristem, different tissue zones are progressively differentiated.


Tissue zones in the shoot apex

Ø  Three main tissue zones are present on the shoot apex of plants, they are:

$.  Protoderm: Protoderm gives rise to the epidermis of the plant.

$.   Procambium: Procambium gives rise to primary vascular tissue (xylem & phloem).

$.   Ground meristem (fundamental meristem): The ground meristem gives rise endodermis, pericycle, cortex, medulla and pith.

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Botany lecture notes

Classification of Meristem PPT

Plant Science PPT

Meristem Classification PPT
(Characteristics and Classification of Meristematic Cells in Plants PPT)

What is Tissue? How Tissue is Classified? What is Meristematic Tissue? What are the Characteristics of Meristematic Cells? Classification of meristem: Apical Meristem, Lateral Meristem, Intercalary Meristem, Primary Meristem, Secondary Meristem.

Learn more: Lecture Note in Classification of Meristem

You can DOWNLOAD the PPT by clicking on the download link below the preview…

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Botany lecture notes

Anatomical Difference between Shoot Apex and Root Apex

Difference between shoot and root apex

Shoot Apex vs Root Apex
(Anatomical Difference between Shoot Apex and Root Apex- A Comparison Table)

Apex is the growing terminal portions of the stem and roots in plants. The apical portion of the stem is called ‘Shoot Apex’ and that of the root is called ‘Root Apex’. The apex portions of both stem and root possess a meristematic tissue called the ‘Apical Meristem’. The shoot apex and root apex shows considerable differences both in their external features (morphology) and internal features (anatomy).

The present post discusses the anatomical similarities and differences between a shoot apex and a root apex with a comparison table.

Similarities between Shoot Apex and Root Apex

Ø  Both shoot apex and root apex are the growing terminal regions.

Ø  Both contain apical meristem.

Ø  The tissue in both shoot and root apex are primary tissue.

Difference between Shoot Apex and Root Apex

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Botany lecture notes

Meristematic Tissue: Structure and Classification (Key Points)

different types of meristematic tissues

What are meristems?

Ø  Meristem is a type plant tissue composed of an undifferentiated mass of cells.

Ø  They are rapidly dividing cells found in the growing portions of the plant and they give rise various plant organs.

Ø  The primary function of meristem is to assist in plant growth.

Ø  Living cells other than meristem can also give rise new cells; however, the meristems carry on such activity indefinitely.

Ø  Meristematic cells not only add new cells to the plant body but also perpetuate themselves.

Ø  Meristematic cells when divide, some portions of division do not differentiate into adult cells but remain meristematic.

Ø  The term meristem was first proposed by Karl Wilhelm von Nägeli (1817–1891) in his book Beiträge zur Wissenschaftlichen Botanik (“Contributions to Scientific Botany”).

Ø  The word meristem is derived from a Greek word ‘merizein’ meaning ‘to divide’.

Characteristics of Meristematic Cells

Ø  The characteristic features of meristematic cells are summarized in the post: Characteristic Features of Meristematic Cells

Classification of meristems

Ø  Meristems are classified according to TWO criterions

(1). Classification based on position in the plant body

§  Apical meristem

§  Lateral meristem

§  Intercalary meristem

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