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Mandarin orange

life science Maturity 5-7 Next article →

The mandarin orange, known scientifically as Citrus reticulata, is a small and rounded citrus fruit. It is considered a distinct species of orange and is highly valued for its flavor. Unlike the roughly spherical sweet orange, which is a hybrid of a mandarin and a pomelo, the mandarin is often oblate. This means the fruit is slightly flattened at the poles. Mandarins are prized because they taste sweeter and stronger than common oranges. They are also famous for being easy to peel due to their thin, loose skin.

Mandarinier Gortyne
Mandarinier Gortyne

To understand how a mandarin grows, one must look at its tree. The mandarin tree is a moderate-sized plant with a trunk and major branches that feature thorns. Its leaves are small, green, and quite shiny. The flowers grow either alone or in small groups within the leaf-axils. Some citrus trees are self-fertile, meaning a bee can move pollen within a single flower. Others are parthenocarpic, which means they do not require pollination and can produce seedless fruit, such as the satsuma. Because these trees are tender, they must be grown in tropical or subtropical areas to avoid cold damage.

The anatomy of the fruit makes it very user-friendly. A ripe mandarin is firm to slightly soft, heavy for its size, and has a pebbly skin. The peel is thin and contains very little white mesocarp, which is the spongy layer between the skin and the fruit. This lack of mesocarp allows the peel to come off easily and helps the fruit split into segments. The fruit color can range from orange to yellow-orange or even red-orange. While some varieties contain a small number of seeds, many are seedless.

Hybrid origins of Citrus
Hybrid origins of Citrus

Genetics reveal that the wild mandarin is a vital ancestor in the citrus family. It evolved in a restricted region of South China and Vietnam. While the original wild mandarins were actually bitter, most modern commercial strains are hybrids. Most of these sweet varieties resulted from hybridization with the pomelo. Scientists believe domestication happened at least twice in the Nanling Mountains. This resulted in two distinct genetic clusters. The northern cluster produces larger, redder fruit like the Satsuma. The southern cluster produces smaller, yellower fruit like the Ponkan or Cleopatra.

Taxonomy, or the science of naming organisms, varies depending on the system used. The Tanaka classification system treats many mandarins, such as tangerines and satsumas, as separate species. However, the Swingle system views them all as varieties of Citrus reticulata. Some modern genomic studies suggest a different view. They propose that because most mandarins contain pomelo DNA, they should be classified as varieties of the hybrid bitter orange, Citrus aurantium. This highlights how complex the evolutionary history of citrus can be.

Global production of mandarins is quite large. In 2022, the world produced 44.2 million tonnes of mandarin oranges, including tangerines and clementines. China is the dominant producer, accounting for 61% of the global total. Spain produced 1.8 million tonnes in 2022, with Turkey, Egypt, and Morocco also being significant producers. Nutritionally, the fruit is mostly water, containing 85% liquid and 13% carbohydrates. It is also a significant source of vitamin C, providing 32% of the Daily Value in a 100-gram serving.

Beyond nutrition, mandarins have deep cultural and culinary significance. They are eaten fresh, used in salads, or squeezed for juice. The peel is also useful; it can be used as zest or dried to become chenpi. In North America, mandarins are a popular Christmas tradition. This began in the 1880s when Japanese immigrants received them as New Year gifts. Some believe the orange serves as a symbolic stand-in for the gold coins associated with Saint Nicholas. In the past, "Orange Trains" even traveled by rail to deliver these fruits during the holiday season.

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File:Mandarinier Gortyne.jpg
Mandarinier Gortyne.jpg
File:Hybrid origins of Citrus.svg
Hybrid origins of Citrus.svg
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