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Nectary  [ Botany ]
Synonym: Nectar gland
Dictionary of botanic terminology
index of names
     
  A multicellular glandular structure secreting nectar. Found in flowers and on vegetative parts in some species of plants, often forming projections, lobes, or disk-like structures.  
     
Nectaries are organs usually located within the base of the flower (floral nectaries) or on other portions of the plant (extrafloral nectaries)
Extrafloral Nectary also called (in cactus)  Areolar gland [ Botany ]

Nectary of Coryphantha echinoidea
Red nectary of
Coryphantha echinoidea

Extra-floral nectaries (areolar glands) are glands, usually located (in Cactus) in the tubercle-grooves or in the axils.

These nectary-glands exude a viscous juice ( nectar) with a high sugar-content and represent a sophisticated strategy for ant attraction.
 


A drop of nectar
(Glandulicactus wrightii)

 
  1. The first hypothesis for why plants secrete extra floral nectar is that the presence of pugnacious ants seems to reduce the vulnerability of flower buds by herbivores insect, resulting in greater fruit production and tissue survival. (or by decreasing seed predation on plants.)
  2. The second hypothesis is that they distract ants from foraging at floral nectaries, this might also serve as an adaptation to reduce ant visitation to flowers.
  3. The third hypothesis is the nutrient enhancement. Ant colonies tend to concentrate nutrients in the immediate vicinity of their nests -- through storing food, discarding debris, and defecating - plant that bearing extra floral nectar attract ant nests to their base.
  4. Moreover ants can play an important rule in distributing the seeds of these plant.
    In humid conditions, the nectar exudation (if not completely removed by ants) can cause the formation of mould which leads to ugly black-colouring of the epidermis. To prevent this, spray off the plant with water to remove the nectar. And provide a very good ventilation.
    (For example Coryphantha echinoidea)
  5. Moreover ants can play an important rule in distributing the seeds of these plant.

In humid conditions, the nectar exudation (if not completely removed by ants) can cause the formation of mould which leads to ugly black-colouring of the epidermis. To prevent this, spray off the plant with water to remove the nectar. And provide a very good ventilation.
(For example Coryphantha echinoidea)

Floral Nectary  [ Botany ]
     
 
 
 
 
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