Mandarin orange

Mandarin orange
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Rosids
Order:	Sapindales
Family:	Rutaceae
Genus:	Citrus
Species:	C. reticulata
Binomial name
Citrus reticulata Blanco

The mandarin orange (Citrus reticulata), also known as the mandarine, is a small citrus tree with fruit resembling other oranges.

Mandarins are usually eaten plain or in fruit salads. Specifically reddish-orange mandarin cultivars can be marketed as tangerines, but this is not a botanical classification.

Thin, pebbly skin

Mandarins are smaller and less spherical than common oranges (which are a mandarin hybrid). The taste is considered less sour, as well as sweeter and stronger.^[1] A ripe mandarin is firm to slightly soft, heavy for its size, and pebbly-skinned. The peel is very thin, with very little bitter white mesocarp,^[2] so they are usually easier to peel and to split into segments. Hybrids generally have these traits to a lesser degree.

The tree is more drought-tolerant than the fruit. The mandarin is tender and is damaged easily by cold. It can be grown in tropical and subtropical areas.

According to molecular studies,^[3] the mandarin, the citron, the pomelo, and the papeda were the ancestors of most other commercial citrus varieties, through breeding or natural hybridization; mandarins are therefore all the more important as the only sweet fruit among the parental species.

Uses

Dried mandarin peel used as a seasoning

Chocolate-coated citrus peel.

Canned and peeled mandarin orange segments

Fresh mandarins

Mandarins are generally peeled and eaten fresh. The fresh fruit is also used in salads, desserts and main dishes. Fresh tangerine juice and frozen juice concentrate are commonly available in the United States. The number of seeds in each segment (carpel) varies greatly.

Peel

The peel is used fresh, whole or zested, or dried as chenpi. It can be used as a spice for cooking, baking, drinks, or candy.

Canning

Canned mandarin segments are peeled to remove the white pith prior to canning; otherwise, they turn bitter. Segments are peeled using a chemical process. First, the segments are scalded in hot water to loosen the skin; then they are bathed in a lye solution, which digests the albedo and membranes. Finally, the segments undergo several rinses in plain water. They are often used in salads, desserts, and baking.

Traditional medicine

In traditional Chinese medicine, the dried peel of the fruit is used in the regulation of ch'i, and also used to treat abdominal distension, to enhance digestion, and to reduce phlegm.^[4] Mandarins have also been used in ayurveda (traditional medicine of India).^[5]

Production volume and nutrition

Tangerines, mandarins, clementines, satsumas Top 20 producers in 2011 (1000 tonnes)
People's Republic of China	12,482
Spain	2,117
Brazil	1,005
Japan	928
Turkey	872
Italy	853
Egypt	848
Iran	800
Morocco	753
South Korea	681
United States	596
Pakistan	515
Mexico	406
Argentina	401
Thailand	360
Peru	236
Algeria	218
Taiwan	197
Nepal	179
Maldives	152
All other	1,582
World total	26,030
Source: UN Food and Agriculture Organisation (FAO),[6]

Cultural significance

Mandarin fruitlets

During Chinese New Year, mandarin oranges and tangerines are considered traditional symbols of abundance and good fortune. During the two-week celebration, they are frequently displayed as decoration and presented as gifts to friends, relatives, and business associates.

Mandarin oranges, particularly from Japan, are a Christmas tradition in Canada, the United States and Russia. In the United States, they are commonly purchased in 5- or 10-pound boxes, individually wrapped in soft green paper, and given in Christmas stockings. This custom goes back to the 1880s, when Japanese immigrants in the United States began receiving Japanese mandarin oranges from their families back home as gifts for the New Year. The tradition quickly spread among the non-Japanese population, and eastwards across the country: each November harvest, "The oranges were quickly unloaded and then shipped east by rail. 'Orange Trains' – trains with boxcars painted orange – alerted everyone along the way that the irresistible oranges from Japan were back again for the holidays. For many, the arrival of Japanese mandarin oranges signaled the real beginning of the holiday season."^[7]

Mandarin oranges covered with snow

This Japanese tradition merged with European traditions related to the Christmas stocking. Saint Nicholas is said to have put gold coins into the stockings of three poor girls so that they would be able to afford to get married.^[8] Sometimes the story is told with gold balls instead of bags of gold, and oranges became a symbolic stand-in for these gold balls, and are put in Christmas stockings in Canada^[8][9] along with chocolate coins wrapped in gold foil.

Satsumas were also grown in the United States from the early 1900s, but Japan remained a major supplier.^[10] U.S. imports of these Japanese oranges was suspended due to hostilities with Japan during World War II.^[7] While they were one of the first Japanese goods allowed for export after the end of the war, residual hostility led to the rebranding of these oranges as "mandarin" oranges.^[7]

The delivery of the first batch of mandarin oranges from Japan in the port of Vancouver, British Columbia, is greeted with a festival that combines Santa Claus and Japanese dancers^[9]—young girls dressed in traditional kimonos.^[11]

In Russia, mandarin oranges are traditionally used as Christmas tree and New Year tree decorations. In Russia, mandarin oranges (tangerines) have traditionally been supplied from Morocco and are associated with that country, even though nowadays they are also supplied from other countries, e.g. Spain, Israel and Egypt.

Genetics

Mandarins are one of the four core ancestral citrus taxa, and are thought to have evolved in Vietnam, south China, and Japan.^[12]

Pure mandarins seem to divide into two groups; an edible group, including the Nanfengmiju, and an "acidic" group, which is too sour to be edible but which is widely used as rootstock and grown for juice; this includes Sunki, Shekwasha, and Cleopatra mandarins.^[13]

Under the Tanaka classification system, mikans, satsumas, tangerines etc. are considered to be divided into different species, including Citrus unshiu and Citrus tangerina. Under the Swingle system, all these are considered to be groups of mandarin varieties.^[13] Unshius and tangerines genetically resemble mandarins,^[13] but the genetics are still not thoroughly studied.

Like all citrus fruit, mandarins hybridize readily with other citrus. Many fruit sold as mandarins are in fact hybrids with some pummelo (C. maxima) ancestry, and are thus on a continumn with clementines, sweet and sour oranges, and grapefruit.^[12]

Hybrids between mandarins and other citrus fruits are sold under a variety of names; see below.

Varieties

Mandarins marketed as tangerines in the US are or were usually Dancy, Sunburst or Murcott (Honey) cultivars; Sunbursts and Murcotts are hybrids.

Unripe fruit.

Pure mandarins

• Nanfengmiju (Citrus reticulata Blanco)^[14] A rare non-hybrid citrus.^[12] One of the most widely cultivated varieties in China.^[15]
• Cleopatra mandarin
• Shekwasha, a very sour mandarin grown for its acidic juice.
• Sunki
• ? The Dancy may be a pure mandarin.^[16] Until the 1970s, most tangerines grown and eaten in the USA were Dancys, and it was known as "Christmas tangerine"^[17] and zipper-skin tangerine^[18]
• ? Obenimikan may be a synonym for Dancy^[19]

Unknown

• Satsuma (Citrus unshiu), a seedless variety, of which there are over 200 cultivars, including Wenzhou migana, Owari, and mikan; the source of most canned mandarins, and popular as a fresh fruit due to its ease of consumption
  • Owari, a well-known Satsuma cultivar that ripens during the late fall season
• Tangerine (Citrus tangerina)^[20]

Hybrids with mandarin ancestry

Kinnow, a 'King' (Citrus nobilis) × 'Willow Leaf' (Citrus × deliciosa) cross, developed by Dr H.B. Frost

• Lemandarins
  • Meyer lemon, a mandarin × lemon hybrid.
  • Rangpur, a different mandarin × lemon hybrid.
• Mandarin × pumelo hybrids, sometimes called mandelos
  • The Mandelo cultivar, a specific indirect complex mandarin × pumelo hybrid
  • Huanglingmiao, a mandarin × pumelo hybrid^[16][21]
  • The Ponkan, a mandarin × pumelo hybrid^[12][22]
  • Mediterranean/Willowleaf/Thorny (Citrus × deliciosa), a mandarin × pumelo hybrid^[22]
    • Kinnow (see image), a 'King' (Citrus nobilis) × 'Willow Leaf' (Citrus × deliciosa) hybrid.
  • The common sweet orange is 75% mandarin and 25% pumelo
    • Tangors, or temple oranges, are crosses between the mandarin orange and the common sweet orange;^[21] their thick rind is easy to peel and its bright orange pulp is sour-sweet and full-flavored
      • Clementine, (Citrus ×clementina), a hybrid between a mandarin orange and a sweet orange,^[22] so named in 1902;^[23] sometimes known as a "Thanksgiving Orange" or "Christmas orange", as its peak season is winter; an important commercial mandarin orange form, having displaced mikans in many markets
        • Clemenules or Nules, a variety of Clementine named for the Valencian town where it was first bred in 1953; it is the most popular variety of Clementine grown in Spain.^[24]
      • Murcott, a mandarin × sweet orange hybrid.^[22][25]
        • Tango is a proprietary seedless mid-late season irradiated selection of murcott developed by the University of California Citrus Breeding Program.^[26]
      • Fairchild is a Clementine-Orlando) hybrid

Non-mandarins

• Mangshanyegans, long thought to be mandarins, are in fact a separate species.^[21]

Biological characteristics

Citrus fruits are usually self-fertile (needing only a bee to move pollen within the same flower) or parthenocarpic (not needing pollination and therefore seedless, such as the satsuma).

Blossoms from the Dancy cultivar are one exception. They are self-sterile, and therefore must have a pollinator variety to supply pollen, and a high bee population to make a good crop.

See also

• Japanese citrus
• Tangerine
• Citrus unshiu
• Ju Song – "In Praise of the Orange-Tree"

References

Notes

External links

Wikimedia Commons has media related to Citrus reticulata.

• Data related to Citrus reticulata at Wikispecies
• Mandarin Orange Nutrition Facts
• UC Riverside Mandarin Variety Descriptions
• Mandarin Orange – from Morton, J. (1987) Fruits of Warm Climates