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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Botany lecture notes

Difference Between Meristematic Tissues and Permanent Tissues in Plants

Meristem Vs Permanent Tissue

Meristematic Tissues Vs Permanent Tissues
Similarities and Difference between Meristematic Tissues and Permanent Tissues

Tissue is a group of cells with more or less common origin and doing a specific function. Plant tissues are broadly classified into two categories based on their capacity of cell division. They are (1) Meristematic tissues and (2) Permanent tissues. Meristem is a type of tissue system in plants, composed of a mass of undifferentiated cells and their primary function is to take part in the growth of plants.

Permanent tissues are differentiated tissues doing specific functions such as conduction, providing mechanical support or carrying out photosynthesis etc. Permanent tissues are originated and differentiated from meristematic tissues.

In this post we will discuss about the similarities and differences between two fundamentally different tissue systems namely Meristematic tissues and Permanent tissues.

Similarities between Meristematic Tissues and Permanent Tissues:

Ø  Both are tissue systems in plants

Ø  Both composed of group of cells, doing specific function

Ø  Meristematic tissues and some permanent tissues (parenchyma) are homogenous with a single type of cells

Difference between Meristematic Tissues and Permanent tissues:

(1). Meristematic Tissues:

(1). Meristematic tissue composed of undifferentiated cells

(2). Meristems will be always a simple tissue, composed of only one type of cells

(3). Cells are always living

(4). Cells always contain dense cytoplasm

(5). Cells always contain prominent nucleus

(6). Cells divide very rapidly

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