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Meristem   [ Botany ]

Dictionary of botanic terminology - index of names

     
  Meristem is a type of tissue in plants consisting of unspecialized, youthful cells called meristematic cells that can divide indefinitely in new cells and then differentiate into permanent structures. Meristem provide new cells for expansion of tissues.  
     

Meristem is found in areas of the plant where growth is or will take place. A particularly active meristematic tissues is situated at the tip (apex) of growing Stem , branches or root and is called apical meristem.
see also:  Primary meristem,   Secondary meristem, Meristematic cells

     
Meristematic cells  [ Botany ]
     
     
     

 


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Holdfast roots  [ Botany  ]

Dictionary of botanic terminology - index of names

 
     
  Some species of climbing plants develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place.  
     
Climbing plants, like the poison ivy (Toxicodendron radicans), Boston ivy (Parthenocissus tricuspidata), and trumpet creeper (Campsis radicans),  develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place. Usually the Holdfast roots die at the end of the first season, but in some species they are perennial. In the tropics some of the large climbing plants have hold-fast roots by which they attach themselves, and long, cord-like roots that extend downward through the air and may lengthen and branch for several years until they strike the soil and become absorbent roots.

Major references and further lectures:
1) E. N. Transeau “General Botany” Discovery Publishing House, 1994
     

 

 

 

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