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Anatomy of Flowering Plants

Meristematic Tissues (Group B)

  • A tissue is a group of cells having a common origin and performing the same function.

  • On the basis of their ability to divide, plant tissues can be divided into

    • meristematic tissue

    • permanent tissue

Meristematic Tissue

  • Meristems - specialized region of cell division where growth is restricted

  • Primary meristem = Apical meristem + Intercalary meristem

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  • Axillary bud − These are buds constituted by some apical meristems left behind during the elongation of stems and leaves. These buds are capable of forming branches and flowers.

  • In course of formation of primary plant body, specific regions of apical meristem produce dermal, ground, and vascular tissues.

  • Following division in both primary and secondary meristems, the new cells so formed lose the capacity to divide and become permanent tissues.

Simple Permanent Tissues

 

  • Based on the structural differences, plant permanent tissues are of two types:

    • Simple permanent tissues

    • Complex permanent tissues

  • Simple permanent tissues:

 

 

Secondary Growth

  • Primary growth: The growth of the root and the stem lengthwise brought about by the apical meristem

  • Secondary growth: Increase in girth exhibited by most dicot plants

  • The tissues involved in secondary growth are collectively known as lateral meristems. Lateral meristems consist of:

    • Vascular cambium

    • Cork cambium

Vascular Cambium

  • Meristematic layer responsible for vascular tissue formation

  • In the young stem, it is present in patches between the xylem and the phloem; later, it forms a ring

  • Formation of the cambial ring:

    • Intrafascicular cambium − cells of the cambium present between primary xylem and primary phloem in a dicot stem

    • Cells of medullary rays adjoining the intrafascicular cambium also become meristematic, and form interfascicular cambium thereafter.

    • Thus, a continuous rin…

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