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Calcium Chemistry  ]
Abbreviation: Ca

Dictionary of botanic terminology - index of names

     
   
     
Calcium deficiency [ Horticulture - Phytopathology ]
     
  Absence or insufficiency of calcium needed for normal growth and development.  
     
Calcium deficiency symptoms are most pronounced in young plant tissue. The emerging leaves produce brownish-black (dead tissue) areas along the leaf margins. The newer or bud leaves are distorted at their tips or bases. This causes later growth to have a cut-out appearance at these points. As the leaf expands, the surfaces can become puckered because of the injury to the leaf tips. With more severe calcium deficiency, the new bud tissue or entire growing point may blacken and die.
     

 


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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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