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Growth resumption [ Botany -Physiology ]
Synonym:
Vegetative resumption

Dictionary of botanic terminology
index of names

     
  The phase in which a plant  or plant organ begins again to grow actively after a time of arrested development. The breaking of a dormancy.  
     
[From Latin “resumption-“ past participle of "resumere" = recovery ]
   
The growth resumption  (or vegetative resumption) is the phase when a plant or other vegetative part ( budseed or other structure) recommence to grow after a period of dormancy.

For example the resumption of active growth by perennials in spring after the winter rest, the starting of germination of a dormant seed after a time of arrested embryonic development,  the growing of new shoot apices and adventitious buds or the resumption of growth after transplantation.

The induction of a vegetative resumption subsequent to a stationary-phase is a physiological response depending by the interaction of several external and internal factors.
Among the external factors the most important are temperatures, rains, photoperiod and nutrients availability.
The internal factors include:
Genetic make up (activation of genes preferentially expressed in growing shoot apices)
Biochemical changes (e.g. Carbohydrates and stored nutrients availability, enzymes activities, etc.)
• Loss of inhibition (abscisic acid) and greater availability than before of growth factors ( e.g. gibberellins, auxins and cytokinins )

 


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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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