Orange (fruit)

Orange
Orange blossoms and oranges on tree
Scientific classification
Kingdom: Plantae (unranked): Angiosperms (unranked): Eudicots (unranked): Rosids Order: Sapindales Family: Rutaceae Genus: Citrus Species: C. sinensis
Binomial name
Citrus sinensis (L.) Osbeck[1]

An orange—specifically, the sweet orange—is the citrus Citrus sinensis (syn. Citrus aurantium L. var. dulcis L., or Citrus aurantium Risso) and its fruit. The orange is a hybrid of ancient cultivated origin, possibly between pomelo (Citrus maxima) and tangerine (Citrus reticulata). It is a small flowering tree growing to about 10 m tall with evergreen leaves, which are arranged alternately, of ovate shape with crenulate margins and 4–10 cm long. The orange fruit is a hesperidium, a type of berry.

Oranges originated in Southeast Asia. The fruit of Citrus sinensis is called sweet orange to distinguish it from Citrus aurantium, the bitter orange. In a number of languages, it is known as a "Chinese apple" (e.g. Dutch Sinaasappel, "China's apple", or "Apfelsine" in German). The name is thought to ultimately derive from the Dravidian word for the orange tree, with its final form developing after passing through numerous intermediate languages.

Fruit

All citrus trees are of the single genus, Citrus, and remain largely interbreedable; that is, there is only one "superspecies" which includes grapefruits, lemons, limes and oranges. Nevertheless, names have been given to the various members of the genus, oranges often being referred to as Citrus sinensis and Citrus aurantium. Fruits of all members of the genus Citrus are considered berries because they have many seeds, are fleshy and soft, and derive from a single ovary. An orange seed is called a pip. The white thread-like material attached to the inside of the peel is called pith.

Varieties

Persian orange

The Persian orange, grown widely in southern Europe after its introduction to Italy in the 11th century, was bitter. Sweet oranges brought to Europe in the 15th century from India by Portuguese traders, quickly displaced the bitter, and are now the most common variety of orange cultivated. The sweet orange will grow to different sizes and colours according to local conditions, most commonly with ten carpels, or segments, inside.

Some South East Indo-European tongues name orange after Portugal, which was formerly the main source of imports of sweet oranges. Examples are Bulgarian portokal [портокал], Greek portokali [πορτοκάλι], Persian porteghal [پرتقال], and Romanian portocală. Also in South Italian dialects (Neapolitan), orange is named portogallo or purtualle, literally "the Portuguese ones". Related names can also be found in other languages: Turkish Portakal, Arabic al-burtuqal [البرتقال], Amharic birtukan, and Georgian phortokhali [ფორთოხალი].

Portuguese, Spanish, Arab, and Dutch sailors planted citrus trees along trade routes to prevent scurvy. On his second voyage in 1493, Christopher Columbus brought the seeds of oranges, lemons and citrons to Haiti and the Caribbean. They were introduced in Florida (along with lemons) in 1513 by Spanish explorer Juan Ponce de Leon, and were introduced to Hawaii in 1792.

Navel orange

A peeled sectioned navel orange. The underdeveloped twin is located on the bottom right.

A single mutation in 1820 in an orchard of sweet oranges planted at a monastery in Brazil yielded the navel orange, also known as the Washington, Riverside, or Bahie navel. The mutation causes navel oranges to develop a second orange at the base of the original fruit, opposite the stem. The second orange develops as a conjoined twin in a set of smaller segments embedded within the peel of the larger orange. From the outside, the smaller, undeveloped twin leaves a formation at the bottom of the fruit that looks similar to the human navel.

Because the mutation left the fruit seedless and, therefore, sterile, the only means available to cultivate more of this new variety is to graft cuttings onto other varieties of citrus tree. Two such cuttings of the original tree were transplanted^[2] to Riverside, California in 1870, which eventually led to worldwide popularity.

Today, navel oranges continue to be produced via cutting and grafting. This does not allow for the usual selective breeding methodologies, and so not only do the navel oranges of today have exactly the same genetic makeup as the original tree, and are therefore clones; in a sense, all navel oranges can be considered to be the fruit of that single over-a-century-old tree.

On rare occasions, however, further mutations can lead to new varieties.^[3]

Valencia orange

The Valencia or Murcia orange is one of the sweet oranges used for juice extraction. It is a late-season fruit, and therefore a popular variety when the navel oranges are out of season. For this reason, the orange was chosen to be the official mascot of the 1982 FIFA World Cup, which was held in Spain. The mascot was called "Naranjito" ("little orange"), and wore the colours of the Spanish soccer team uniform.

Blood orange

The blood orange has streaks of red in the fruit, and the juice is often a dark burgundy colour. The fruit has found a niche as an interesting ingredient variation on traditional Seville marmalade, with its striking red streaks and distinct flavour. The scarlet navel is a variety with the same diploid mutation as the navel orange.

Acidity

Like all citrus fruits, the orange is acidic, with a PH level of around 2.5-3; depending on the age, size and variety of the fruit. Although this is not, on average, as strong as the lemon, it is still quite strong on the scale - as strong as vinegar.

Production

Orange output in 2005

Top Orange Producers — 2005 (million tonnes)
Brazil	17.8
United States	8.4
Mexico	4.1
India	3.1
China	2.4
Spain	2.3
Italy	2.2
Iran	1.9
Egypt	1.8
Pakistan	1.6
World Total	61.7
Source: UN Food & Agriculture Organisation (FAO)[4]

Oranges grown for commercial production are generally grown in groves and are produced throughout the world. The top three orange-producing countries are Brazil, the United States, and Mexico. Oranges are sensitive to frost, and a common treatment to prevent frost damage when sub-freezing temperatures are expected, is to spray the trees with water, since as long as unfrozen water is turning to ice on the trees' branches, the ice that has formed stays just at the freezing point, giving protection even if air temperatures have dropped far lower.^[5]

Etymology

Main article: Orange (word)

The word orange is derived from Sanskrit nāraṅgaḥ "orange tree."^[6] The Sanskrit word was borrowed into European languages through Persian nārang, Armenian nārinj, Arabic nāranj, (Spanish naranja and Portuguese laranja), Late Latin arangia, Italian arancia or arancio, and Old French orenge, in chronological order. The first appearance in English dates from the 14th century. The forms starting with n- are older; this initial n- may have been mistaken as part of the indefinite article, in languages with articles ending with an -n sound (e.g., in French une norenge may have been taken as une orenge). The name of the colour is derived from the fruit, first appearing in this sense in 1542.

Some languages have different words for the bitter and the sweet orange, such as Modern Greek nerantzi and portokali, respectively. Or in Persian, the words are narang and porteghal (Portugal), in the same order. The reason is that the sweet orange was brought from China or India to Europe during the 15th century by the Portuguese. For the same reason, some languages refer to it as Applesin (or variants), which means "Apple from China," while the bitter orange was introduced through Persia.

In Tamil this tree is known as நாகருகம் (Nagarukam).

Juice and other products

Oranges and orange juice.

Oranges are widely grown in warm climates worldwide, and the flavours of oranges vary from sweet to sour. The fruit is commonly peeled and eaten fresh, or squeezed for its juice. It has a thick bitter rind that is usually discarded, but can be processed into animal feed by removing water, using pressure and heat. It is also used in certain recipes as flavouring or a garnish. The outer-most layer of the rind can be grated or thinly veneered with a tool called a zester, to produce orange zest. Zest is popular in cooking because it contains the oil glands and has a strong flavour similar to the fleshy inner part of the orange. The white part of the rind, called the pericarp or albedo and including the pith, is a source of pectin and has nearly the same amount of vitamin C as the flesh.

Products made from oranges include:

• Orange juice is one of the commodities traded on the New York Board of Trade. Brazil is the largest producer of orange juice in the world, followed by the USA. It is made by squeezing the fruit on a special instrument called a "juicer" or a "squeezer." The juice is collected in a small tray underneath. This is mainly done in the home, and in industry is done on a much larger scale.
• Frozen orange juice concentrate is made from freshly squeezed and filtered orange juice.^[7]
• Sweet orange oil is a by-product of the juice industry produced by pressing the peel. It is used as a flavouring of food and drink and for its fragrance in perfume and aromatherapy. Sweet orange oil consists of about 90% d-Limonene, a solvent used in various household chemicals, such as to condition wooden furniture, and along with other citrus oils in grease removal and as a hand-cleansing agent. It is an efficient cleaning agent which is promoted as being environmentally friendly and preferable to petroleum distillates. However, d-Limonene is classified as toxic or very toxic in several countries. Its smell is considered more pleasant by some than those of other cleaning agents. Although once thought to cause renal cancer in rats, limonene now is known as a significant chemopreventive agent^[8] with potential value as a dietary anti-cancer tool in humans.^[9] There is no evidence for carcinogenicity or genotoxicity in humans. The IARC classifies d-limonene under Class 3: not classifiable as to its carcinogenicity to humans.

• The orange blossom, which is the state flower of Florida, is traditionally associated with good fortune, and was popular in bridal bouquets and head wreaths for weddings for some time. The petals of orange blossom can also be made into a delicately citrus-scented version of rosewater. Orange blossom water (aka orange flower water) is a common part of both French and Middle Eastern cuisines, used most often as an ingredient in desserts. The orange blossom gives its touristic nickname to the Costa del Azahar ("Orange-blossom coast"), the Castellon seaboard.
• In Spain, fallen blossoms are dried and then used to make tea.
• In the United States, orange flower water is used to make orange blossom scones.
• Orange blossom honey, or actually citrus honey, is produced by putting beehives in the citrus groves during bloom, which also pollinates seeded citrus varieties. Orange blossom honey is highly prized, and tastes much like orange.
• Marmalade, a conserve usually made with Seville oranges. All parts of the orange are used to make marmalade: the pith and pips are separated, and typically placed in a muslin bag where they are boiled in the juice (and sliced peel) to extract their pectin, aiding the setting process.
• Orange peel is used by gardeners as a slug repellent.
• Orange leaves can be boiled to make tea.

Gallery

See also

• Cam sành (terra-cotta orange)
• Mandarin orange

Footnotes

References

• McPhee, John. Oranges (1966) - focuses on Florida groves.
• Sackman, Douglas Cazaux. Orange Empire: California and the Fruits of Eden (2005) comprehensive, multidimensional history of citrus industry in California
• Train, John. Oranges (2006)

External links

• Citrus sinensis List of Chemicals (Dr. Duke's Databases)
• "Le Bigaradier" Bitter Orange Tree