Halophyte
A halophyte is a plant that grows where it is affected by salinity in the root area or by salt spray, such as in saline semi-deserts, mangrove swamps, marshes and sloughs, and seashores. An example of a halophyte is the salt marsh grass Spartina alterniflora (smooth cordgrass). Relatively few plant species are halophytes - perhaps only 2% of all plant species. The large majority of plant species are "glycophytes", and are damaged fairly easily by salinity.[1]
One quantitative measure of salt tolerance is the "total dissolved solids" in irrigation water that a plant can tolerate. Sea water typically contains 40 grams per litre (g/l) of dissolved salts (mostly sodium chloride). Beans and rice can tolerate about 1-3 g/l, and are considered glycophytes (as are most crop plants). At the other extreme, Salicornia bigelovii (dwarf glasswort) grows well at 70 g/l of dissolved solids, and is a promising halophyte for use as a crop. [2] Plants such as barley (Hordeum vulgare) and the date palm (Phoenix dactylifera) can tolerate about 5 g/l, and can be considered as marginal halophytes.[1]
Adaptation to saline environments by halophytes may take the form of salt tolerance (see halotolerance) or salt avoidance. Plants that avoid the effects of high salt even though they live in a saline environment may be referred to as facultative halophytes rather than 'true', or obligatory, halophytes.
For example, a short-lived plant species that completes its reproductive life cycle during periods (such as a rainy season) when the salt concentration is low would be avoiding salt rather than tolerating it. Or a plant species may maintain a 'normal' internal salt concentration by excreting excess salts through its leaves or by concentrating salts in leaves that later die and drop off.
[edit] Halophytes as Biofuel
Some halophytes are being studied for use as "3rd generation" biofuel precursors.[3] Halophytes such as Salicornia bigelovii can be grown in harsh environments and typically do not compete with food crops for resources, making them promising sources of biodiesel[4] or bioalcohol.
[edit] See also
- Atriplex (saltbush) (orache) (orach)
- Babassu
- Switchgrass
- Yerba mansa
- Tetragonia tetragonoides (Warrigal greens, a leaf vegetable used somewhat like spinach or silver beet)
[edit] References
 |
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (January 2008) |
- ^ a b Glenn, E. P., Brown, J. J., and Blumwald, E. (1999). "Salt Tolerance and Crop Potential of Halophytes", Critical Review in Plant Sciences, Vol. 18, No. 2, pp. 227-255. DOI: 10.1080/07352689991309207
- ^ Glenn, E. P.; Brown, J. J.; O'Leary, J. W. (1998). "Irrigating Crops with Seawater", Scientific American, Vol. 279, no. 8, Aug. 1998, pp. 56-61.
- ^ "Pressroom - Fact Sheet: Alternative Fuels". IATA. August 2008. http://www.iata.org/pressroom/facts_figures/fact_sheets/alt_fuels.htm. Retrieved 2008-11-18.[dead link]
- ^ Glenn, Edward P.; Brown, J. Jed; O'Leary, James W. (August 1998). "Irrigating Crops with Seawater" (PDF). Scientific American (USA: Scientific American, Inc.) (August 1998): 76–81. http://www.miracosta.edu/home/kmeldahl/writing/..%5Carticles/crops.pdf. Retrieved 2008-11-17.
