| Home | E-mail | Cactuspedia | Mail Sale Catalogue | Links | Information | Search  |

 
 
 
Depigmentation   [ Botany ]

Dictionary of botanic terminology - index of names

     
  Partial or total loss of normal pigmentation; bleaching.  
     
A localized or general removal or loss of pigmentation (or less than normal pigmentation) that leads to pale traces or spots on an organs surfaces. Especially of chlorophyll in the leaves, and stems.

Many cultivated  
forms of plants are the result of the deficiency of  a particular pigment ( inherited or artificially induced), this is the case of many white flowering variety and cultivars (of a normally coloured blooming species) that are deficient in some pigments like anthocyanin or betalain.

Compare with: Discoloration, albinos

     

 


Advertising



 

 

1


 
 
 
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
     

 

 

 

| Home | E-mail | Cactuspedia | Mail Sale Catalogue | Links | Information | Search  |