What is the difference between primary and secondary meristem?
Plants experience growth in the shoot and root region. These regions tend to contain meristem tissues. They contain active dividing cells whose main function is to produce new cells.
The core difference between primary and secondary meristem is that the primary meristem is derived from the promeristem while the secondary meristem is derived from permanent tissues.
What Is a Primary Meristem?
Primary meristem occurs at the beginning and it is derived from embryonic cells. It is responsible for giving rise to primary tissues that promote primary growth.
The cells present in the primary meristem are responsible for facilitating growth in length since they are isodiametric.
What Is a Secondary Meristem?
Secondary meristem occurs later in the life of the plant and it is derived from permanent tissues.it is responsible for giving rise to secondary tissues that enhance secondary growth.
Secondary meristem help to foster thickness since it has elongated cells. The cells tend to have several vacuoles.
Comparison Chart: Primary Meristem Vs Secondary Meristem
|Basic Terms||Primary Meristem||Secondary Meristem|
|Meaning||Refers to meristem responsible for primary growth||Refers to meristem responsible for secondary growth|
|Origin||Embryonic tissues||Permanent tissues|
|Formation||Occur at the beginning||Occur later in the life of the plant|
|Morphology of Cells||Cells tend to be isodiametric||Cells have either elongated, barrel-shaped or rectangular-shaped|
|Vacuoles||Lack vacuoles||Have several vacuoles|
|Occurrence||Occur in the apical region||Occur in the lateral region|
|Role||It is responsible for primary growth||It is responsible for secondary growth|
|Type of Growth||Longitudinal growth which increases the length||Lateral growth which increases the width|
|Tissue type||Primary tissues||Secondary tissues|
|Example||Protoderm, procambium, and ground meristem||Vascular cambium and cork cambium|
Core Differences between Primary and Secondary Meristem In Point Form
- Primary meristem support primary growth while secondary meristem support secondary growth
- Primary meristem originate from embryonic tissues while secondary growth originates from permanent tissue
- Primary meristem occurs at the beginning while secondary meristem later in the life of the plant
- The cells of primary meristem are isodiametric while those of secondary meristem are either elongated, barrel-shaped, or rectangular-shaped.
- Primary meristem tend to lack vacuoles while secondary meristem have several vacuoles
- Primary meristem occurs in the apical region while secondary meristem occurs in the lateral region of the plant
- Primary meristem causes primary growth which increases plant length while secondary meristem cause secondary growth which increases plant width
- Primary meristem have primary tissues while secondary meristem have permanent tissues
- Primary meristem enhance longitudinal growth while secondary meristem enhance the lateral type of growth
- Examples of primary meristem are protoderm, procambium, and ground meristem while examples of secondary meristem are vascular cambium and cork cambium.
Similarities between Primary and Secondary Meristem
- Both experience active dividing cells
- Both are parenchymatous cells
- Both contain a prominent nucleus with granular cytoplasm
- Both are metabolically active
- Both are undifferentiated cells
- Both cells are closely packed without intracellular spaces
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The primary meristem is found in the apex region where primary growth is essential while secondary meristem is found in the lateral region where secondary growth tends to happen.