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Molybdenum Chemistry  ]
Abbreviation:
Mo

Dictionary of botanic terminology - index of names

     
   
     
Molybdenum deficiency [ Horticulture - Phytopathology ]
     
  Absence or insufficiency of molybdenum needed for normal growth and development.  
     
Inadequate molybdenum causes yellowing between the leaf veins; the older or mid-stem leaves are the first to be affected. Sometimes a disorder commonly known as "whiptail" may occur. In this case the plants may develop severely twisted young leaves, which eventually 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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