Nectar, in botany, is a liquid made by the flowers of plants. It is sweet because it has sugar in it. Plants make nectar to attract pollinating animals. It is made in glands called nectaries. The nectaries are usually at the bottom of the perianth of the flower. This means the animal trying to get the nectar has to touch the parts of the plant that are used for reproduction. By doing this, the animal getting the nectar helps the plants reproduce.
Nectar is economically important because it is where the sugar for honey comes from. It is also useful in agriculture and horticulture because the adults of many predatory insects, as well as hummingbirds, eat nectar. Some plants give off very rich scents.
Extrafloral nectaries[change | change source]
In contrast to floral nectaries, nectar produced outside the flower generally has a defensive function. The nectar attracts predatory insects which will eat both the nectar and any plant-eating insects around, they work as 'bodyguards'.
Extrafloral nectaries have been reported in over 3941 species of vascular plants belonging to 745 genera and 108 families, 99.7% of which belong to flowering plants (angiosperms). This is 1.0 to 1.8% of all known species. They are most common among eudicots, occurring in 3642 species (of 654 genera and 89 families). They often occur in rosids.
References[change | change source]
- Rudall, Paula J. 2007. Anatomy of flowering plants: an introduction to structure and development (3rd ed.) Cambridge: Cambridge University Press. ISBN 9780521692458.
- Heil, M.; Fiala, B.; Baumann, B.; Linsenmair, K.E. (2000). "Temporal, spatial and biotic variations in extrafloral nectar secretion by Macaranga tanarius". Functional Ecology. 14 (6): 749. doi:10.1046/j.1365-2435.2000.00480.x.
- Plant-provided food for carnivorous insects – Cambridge University Press