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The KEY LIME ( Citrus
Citrus
× aurantiifolia) is a citrus hybrid (C. micrantha x C. medica ) with a globose (spherical shaped) fruit, 2.5–5 cm in diameter (1–2 in), that is yellow when ripe but usually picked green commercially.

It is smaller and seedier, with a higher acidity, a stronger aroma, and a thinner rind , than that of the Persian lime
Persian lime
( Citrus
Citrus
× latifolia). It is valued for its unique flavor compared to other limes. The name comes from its association with the Florida Keys
Florida Keys
, where it is best known as the flavoring ingredient in Key lime pie . It is also known as WEST INDIAN LIME, BARTENDER’S LIME, OMANI LIME, or MEXICAN LIME, the last classified as a distinct race with a thicker skin and darker green color. Philippine varieties have various names, including DAYAP and BILOLO.

CONTENTS

* 1 Etymology * 2 Description * 3 History

* 4 Agronomy

* 4.1 Cultivation and propagation * 4.2 Harvesting * 4.3 Postharvest process * 4.4 Yield

* 5 References * 6 External links

ETYMOLOGY

The English word "lime" was derived, via Spanish then French , from the Arabic word ليمة līma (Persian : لیمو‎‎ limu). "Key" is from Florida Keys
Florida Keys
, where the fruit is naturalized. The Oxford English Dictionary dates the first use of "key lime" to 1905, in an issue of Country Gentleman
Country Gentleman
, which described the fruit as "the finest on the market. It is aromatic, juicy, and highly superior to the lemon."

DESCRIPTION

C. aurantiifolia is a shrubby tree, to 5 m (16 ft), with many thorns . Dwarf varieties exist that can be grown indoors during winter months and in colder climates. Its trunk, which rarely grows straight, has many branches, and they often originate quite far down on the trunk. The leaves are ovate, 2.5–9 cm (1–3 1⁄2 in) long, resembling orange leaves (the scientific name aurantiifolia refers to this resemblance to the leaves of the orange, Citrus
Citrus
aurantium ). The flowers are 2.5 cm (1 in) in diameter, are yellowish white with a light purple tinge on the margins. Flowers and fruit appear throughout the year, but are most abundant from May to September in the Northern Hemisphere.

When in contact with the skin, the Key lime
Key lime
can sometimes cause phytophotodermatitis , in which a chemical reaction makes the skin extra sensitive to ultraviolet light.

HISTORY

See also: Citrus
Citrus
taxonomy

This particular cultivar is a citrus hybrid , likely Citrus
Citrus
micrantha × Citrus
Citrus
medica (a papeda -citron cross).

C. aurantiifolia is native to Southeast Asia
Southeast Asia
. Its apparent path of introduction was through the Middle East
Middle East
to North Africa
North Africa
, then to Sicily
Sicily
and Andalucia
Andalucia
and via Spanish explorers to the West Indies
West Indies
, including the Florida Keys
Florida Keys
. From the Caribbean, lime cultivation spread to tropical and subtropical North America, including Mexico
Mexico
, Florida
Florida
, and later California
California
.

Since the North American Free Trade Agreement
North American Free Trade Agreement
came into effect, many Key limes on the US market are grown in Mexico, Central America
Central America
and South America
South America
. They are also grown in Texas
Texas
, Florida
Florida
, and California
California
.

AGRONOMY

CULTIVATION AND PROPAGATION

Flowers of the Key lime
Key lime
plant

There are various approaches to the cultivation of Key limes. This variety of citrus can be propagated from seed and will grow true to the parent. The seeds must be kept moist until they can be planted, as they will not germinate if allowed to dry out. If the plants are propagated from seed, the seeds should be stored at least 5–6 months before planting. Alternatively, vegetative propagation from cuttings or by air layering may permit fruit production within one year, and from genetically more predictable lines of plants. Or digging around a mature tree to sever roots will encourage new sprouts that can be transplanted to another location. Clones are often bud grafted into rough lemon or sour orange to obtain strong root stocks (see also fruit tree propagation ).

It is often advisable to graft the plants onto rootstocks with low susceptibility to gummosis , because seedlings generally are highly vulnerable to the disease. Useful rootstocks include wild grapefruit, cleopatra mandarin and tahiti limes . C. macrophylla is also sometimes used as a rootstock in Florida
Florida
to add vigor.

Climatic conditions and fruit maturation are crucial in cultivation of the lime tree. Under consistently warm conditions potted trees can be planted at any season, whereas in cooler temperate regions it is best to wait for the late winter or early spring. The Key lime
Key lime
tree does best in sunny sites, well-drained soils, good air circulation, and protection from cold wind. Because its root system is shallow, the Key lime
Key lime
is planted in trenches or into prepared and broken rocky soil to give the roots a better anchorage and improve the trees' wind resistance. Pruning and topping should be planned to maximise the circulation of air and provide plenty of sunlight. This keeps the crown healthily dry, improves accessibility for harvesting, and discourages the organisms that cause gummosis.

HARVESTING

White key lime flower in different stages.

The method of cultivation greatly affects the size and quality of the harvest. Trees cultivated from seedlings take 4–8 years before producing a harvest. They attain their maximal yield at about 10 years of age. Trees produced from cuttings and air layering bear fruit much sooner, sometimes producing fruit (though not a serious harvest) a year after planting. It takes approximately 9 months from the blossom to the fruit. When the fruit have grown to harvesting size and begin to turn yellow they are picked and not clipped. To achieve produce of the highest market value, it is important not to pick the fruit too early in the morning; the turgor is high then, and handling turgid fruit releases the peel oils and may cause spoilage.

POSTHARVEST PROCESS

3 key lime fruits with persistent styles .

Shelf life
Shelf life
of Key limes is an important consideration in marketing. The lime still ripens for a considerable time after harvesting, and it is usually stored between 12.5 and 15.5 °C (55–60 °F) at a relative humidity of 75–85%. Special
Special
procedures are employed to control the shelf life – for example, applications of growth regulators , fruit wax , fungicides , precise cooling, calcium compounds, silver nitrate , and special packing material. The preferred storage conditions are temperatures of 9–10 °C (48–50 °F) and a humidity over 85%, but even in ideal conditions post-harvesting losses are high.

In India most Key lime
Key lime
producers are small scale farmers without access to such post-harvesting facilities, but makeshift expedients can be of value. One successful procedure is a coating of coconut oil that improves shelf life, thereby achieving a constant market supply of Key limes.

Key limes are made into black lime by boiling them in brine and drying them. Black lime is a condiment commonly used in the Middle East.

YIELD

The yield varies depending on the age of the trees. Five- to seven-year-old orchards may yield about 6 t/ha (2.7 tons/acre), with harvests increasing progressively until they stabilise at about 12–18 t/ha (5.4–8 tons/acre). Seedling trees take longer to attain their maximal harvest, but eventually out-yield grafted trees.

REFERENCES

* ^ "Dayap / Citrus
Citrus
aurantifolia / LIME: Philippine Medicinal Herbs / Philippine Alternative Medicine". Stuartxchange.org. Retrieved 2013-12-20. * ^ "key, n.2". OED Online. September 2013. Oxford University Press. Accessed 24 October 2013. * ^ P. Golob; Food and Agriculture Organization of the United Nations (1999). "Alphabetical List of Plant Families with Insecticidal and Fungicidal Properties". The use of spices and medicinals as bioactive protectants for grains. Food & Agriculture Org. pp. 13–. ISBN 978-92-5-104294-6 . Retrieved 19 June 2011. Webarchive mirror * ^ Citrus
Citrus
aurantiifolia Swingle. Hort.purdue.edu. Retrieved on 2011-06-19. * ^ Weber, I. C.; Davis, C. P.; Greeson, D. M. (1999-03-01). "Phytophotodermatitis: the other "lime" disease". The Journal of Emergency Medicine. 17 (2): 235–237. ISSN 0736-4679 . PMID 10195477 . doi :10.1016/s0736-4679(98)00159-0 . * ^ " Phytophotodermatitis on Fingers of a Young Child Patient Care Online". www.patientcareonline.com. 2003-04-01. Retrieved 2017-03-04. * ^ "BMC Genetics - Full text - Next generation haplotyping to decipher nuclear genomic interspecific admixture in Citrus
Citrus
species: analysis of chromosome 2". doi.org. * ^ Germplasm Resources Information Network, 2010, Citrus aurantiifolia (Christm.) Swingle * ^ Nicolosi, E.; Deng, Z.N.; Gentile, A.; La Malfa, S.; Continella, G.; Tribulato, E. (2000). " Citrus
Citrus
phylogeny and genetic origin of important species as investigated by molecular markers". Theoretical and Applied Genetics. 100 (8): 1155–1166. doi :10.1007/s001220051419 . * ^ Germplasm Resources Information Network, 2010, Citrus aurantiifolia (Christm.) Swingle. * ^ A B C D E Duke J.A., duCellier J.L. (1993): CRC handbook of alternative cash crops (page 139-145) * ^ "T or Shield Budding". tamu.edu. * ^ Morton, Julia F. (1987). "Mexican Lime". Fruits of warm climates. Purdue. pp. 168–172. * ^ "Home Fruit Production". tamu.edu. * ^ Bisen A., Pandey S.K., Patel N.: Effect of skin coatings on prolonging shelf life of kagzi lime fruits ( Citrus
Citrus
aurantiifolia Swingle). Journal of Food Science Technology (2012) 49(6).753-759. (page 139–145)

EXTERNAL LINKS

Wikispecies
Wikispecies
has information related to:

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