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Cucumber
Photograph of cucumber vine with fruits, flowers and leaves visible
Cucumbers growing on vines
A single cucumber fruit
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Cucurbitales
Family: Cucurbitaceae
Genus: Cucumis
Species:
C. sativus
Binomial name
Cucumis sativus

The cucumber (Cucumis sativus) is a widely-cultivated creeping vine plant in the family Cucurbitaceae that bears cylindrical to spherical fruits, which are used as culinary vegetables.[1] Considered an annual plant,[2] there are three main types of cucumber—slicing, pickling, and seedless—within which several cultivars have been created. The cucumber originates in Asia extending from India, Nepal, Bangladesh, China (Yunnan, Guizhou, Guangxi), and Northern Thailand,[3][4][5][6] but now grows on most continents, and many different types of cucumber are grown commercially and traded on the global market. In North America, the term wild cucumber refers to plants in the genera Echinocystis and Marah, though the two are not closely related.

Description

The cucumber is a creeping vine that roots in the ground and grows up trellises or other supporting frames, wrapping around supports with thin, spiraling tendrils.[7] The plant may also root in a soilless medium, whereby it will sprawl along the ground in lieu of a supporting structure. The vine has large leaves that form a canopy over the fruits.[citation needed]

The fruit of typical cultivars of cucumber is roughly cylindrical, but elongated with tapered ends, and may be as large as 62 centimeters (24 in) long and 10 centimeters (4 in) in diameter.[8]

Cucumber fruits consist of 95% water (see nutrition table). In botanical terms, the cucumber is classified as a pepo, a type of botanical berry with a hard outer rind and no internal divisions. However, much like tomatoes and squashes, it is often perceived, prepared, and eaten as a vegetable.[9]

Flowering and pollination

Cucumis sativus flower
Genomic information
NCBI genome ID1639
Ploidydiploid
Genome size323.99 Mb
Sequenced organellemitochondrion
Organelle size244.82 Mb
Year of completion2011

Most cucumber cultivars are seeded and require pollination. For this purpose, thousands of honey beehives are annually carried to cucumber fields just before bloom. Cucumbers may also be pollinated via bumblebees and several other bee species. Most cucumbers that require pollination are self-incompatible, thus requiring the pollen of another plant in order to form seeds and fruit.[10] Some self-compatible cultivars exist that are related to the 'Lemon cucumber' cultivar.[10]

A few cultivars of cucumber are parthenocarpic, the blossoms of which create seedless fruit without pollination, which degrades the eating quality of these cultivar. In the United States, these are usually grown in greenhouses, where bees are excluded. In Europe, they are grown outdoors in some regions, where bees are likewise excluded.[citation needed]

Traditional cultivars produce male blossoms first, then female, in about equivalent numbers. Newer gynoecious hybrid cultivars produce almost all female blossoms. They may have a pollenizer cultivar interplanted, and the number of beehives per unit area is increased, but temperature changes induce male flowers even on these plants, which may be sufficient for pollination to occur.[10]

In 2009, an international team of researchers announced they had sequenced the cucumber genome.[11]

A study of genetic recombination during meiosis in cucumber provided a high resolution landscape of meiotic DNA double strand-breaks and genetic crossovers.[12] The average number of crossovers per chromosome per meiosis was 0.92 to 0.99.[12]

Herbivore defense

Phytochemicals in cucumbers may discourage natural foraging by herbivores, such as insects, nematodes or wildlife.[13] As a possible defense mechanism, cucumbers produce cucurbitacin C,[14] which causes a bitter taste in some cucumber varieties. This potential mechanism is under preliminary research to identify whether cucumbers are able to deter herbivores and environmental stresses by using an intrinsic chemical defense, particularly in the leaves, cotyledons, pedicel, carpopodium, and fruit.[14][15]

Nutrition, aroma, and taste

Cucumber, with peel, raw
Nutritional value per 100 g (3.5 oz)
Energy65 kJ (16 kcal)
3.63 g
Sugars1.67
Dietary fiber0.5 g
0.11 g
0.65 g
Vitamins and minerals
VitaminsQuantity
%DV†
Thiamine (B1)
2%
0.027 mg
Riboflavin (B2)
3%
0.033 mg
Niacin (B3)
1%
0.098 mg
Pantothenic acid (B5)
5%
0.259 mg
Vitamin B6
2%
0.04 mg
Folate (B9)
2%
7 μg
Vitamin C
3%
2.8 mg
Vitamin K
14%
16.4 μg
MineralsQuantity
%DV†
Calcium
1%
16 mg
Iron
2%
0.28 mg
Magnesium
3%
13 mg
Manganese
3%
0.079 mg
Phosphorus
2%
24 mg
Potassium
5%
147 mg
Sodium
0%
2 mg
Zinc
2%
0.2 mg
Other constituentsQuantity
Water95.23 g
Link to USDA database entry
†Percentages estimated using US recommendations for adults,[16] except for potassium, which is estimated based on expert recommendation from the National Academies.[17]

Raw cucumber (with peel) is 95% water, 4% carbohydrates, 1% protein, and contains negligible fat. A 100-gram (3+1⁄2-ounce) reference serving provides 65 kilojoules (16 kilocalories) of food energy. It has a low content of micronutrients: it is notable only for vitamin K, at 14% of the Daily Value (table).

Depending on variety, cucumbers may have a mild melon aroma and flavor, in part resulting from unsaturated aldehydes, such as (E,Z)-nona-2,6-dienal, and the cis- and trans- isomers of 2-nonenal.[18] The slightly bitter taste of cucumber rind results from cucurbitacins.[19]

Varieties

See also: List of cucumber varieties
Three kinds of cucumbers

In general cultivation, cucumbers are classified into three main cultivar groups: slicing, pickled, and seedless/burpless.

Culinary uses

Wikibooks Cookbook has a recipe/module on

Fruit

Slicing

Cucumbers grown to eat fresh are called slicing cucumbers. The main varieties of slicers mature on vines with large leaves that provide shading.[20]

Slicers grown commercially for the North American market are generally longer, smoother, more uniform in color, and have much tougher skin. In contrast, those in other countries, often called European cucumbers, are smaller and have thinner, more delicate skin, often with fewer seeds, thus are often sold in plastic skin for protection. This variety may also be called a telegraph cucumber, particularly in Australasia.[21]

Pickling

Main article: Pickled cucumber

Pickling with brine, sugar, vinegar, and spices creates various flavored products from cucumbers and other foods.[22] Although any cucumber can be pickled, commercial pickles are made from cucumbers specially bred for uniformity of length-to-diameter ratio and lack of voids in the flesh. Those cucumbers intended for pickling, called picklers, grow to about 7 to 10 cm (3 to 4 in) long and 2.5 cm (1 in) wide. Compared to slicers, picklers tend to be shorter, thicker, less-regularly shaped, and have bumpy skin with tiny white or black-dotted spines. Color can vary from creamy yellow to pale or dark green.[citation needed]

Gherkin

Gherkins, also called cornichons,[23] or baby pickles, are small cucumbers, typically those 2.5 to 12.5 centimetres (1 to 5 in) in length, often with bumpy skin, which are typically used for pickling.[24][25][26] The word gherkin comes from the early modern Dutch gurken or augurken ('small pickled cucumber').[27] The term is also used in the name for Cucumis anguria, the West Indian gherkin, a closely related species.[28]

Burpless

Burpless cucumbers are sweeter and have a thinner skin than other varieties of cucumber. They are reputed to be easy to digest and to have a pleasant taste. They can grow as long as 60 centimeters (2 ft), are nearly seedless, and have a delicate skin. Most commonly grown in greenhouses, these parthenocarpic cucumbers are often found in grocery markets, shrink-wrapped in plastic. They are marketed as either burpless or seedless, as the seeds and skin of other varieties of cucumbers are said to give some people gas.[29]

Shoots

Cucumber shoots are regularly consumed as a vegetable, especially in rural areas. In Thailand they are often served with a crab meat sauce. They can also be stir fried or used in soups.[30]

Production

Cucumber production – 2022
Country millions
of tonnes
 China 77.3
 Turkey 1.9
 Russia 1.6
 Mexico 1.1
World 94.7
Source: FAOSTAT of the United Nations[31]

In 2022, world production of cucumbers and gherkins was 95 million tonnes, led by China with 82% of the total.[31]

Cultivation history

Cultivated for at least 3,000 years, the cultivated cucumbers "Cucumis sativus" were domesticated in India from wild "C. sativus var. hardwickii".[32][33][34] where a great many varieties have been observed, along with its closest living relative, Cucumis hystrix.[35] Three main cultivar groups of cucumber are namely Eurasian cucumbers (slicing cucumbers eaten raw and immature), East Asian cucumbers (pickling cucumbers) and Xishuangbanna cucumbers. Based on demographic modelling, the East Asian C. sativus cultivars diverged from the Indian cultivars c. 2500 years ago.[36] It was probably introduced to Europe by the Greeks or Romans. Records of cucumber cultivation appear in France in the 9th century, England in the 14th century, and in North America by the mid-16th century.[1][37][38][39]

Roman Empire

According to Pliny the Elder, the Emperor Tiberius had the cucumber on his table daily during summer and winter. In order to have it available for his table every day of the year, the Romans reportedly used artificial methods of growing (similar to the greenhouse system), whereby mirrorstone refers to Pliny's lapis specularis, believed to have been sheet mica:[40][41]

Indeed, he was never without it; for he had raised beds made in frames upon wheels, by means of which the cucumbers were moved and exposed to the full heat of the sun; while, in winter, they were withdrawn, and placed under the protection of frames glazed with mirrorstone.

— Pliny the Elder, Natural History XIX.xxiii, "Vegetables of a Cartilaginous Nature—Cucumbers. Pepones"

Reportedly, they were also cultivated in specularia, cucumber houses glazed with oiled cloth.[40] Pliny describes the Italian fruit as very small, probably like a gherkin. He also describes the preparation of a medication known as elaterium. However, some scholars[who?] believe that he was instead referring to Ecballium elaterium, known in pre-Linnean times as Cucumis silvestris or Cucumis asininus ('wild cucumber' or 'donkey cucumber'), a species different from the common cucumber.[42] Pliny also writes about several other varieties of cucumber, including the cultivated cucumber,[43] and remedies from the different types (9 from the cultivated; 5 from the "anguine;" and 26 from the "wild").

Middle Ages

Charlemagne had cucumbers grown in his gardens in the 8th/9th century. They were reportedly introduced into England in the early 14th century, lost, then reintroduced approximately 250 years later. The Spaniards (through the Italian Christopher Columbus) brought cucumbers to Haiti in 1494. In 1535, Jacques Cartier, a French explorer, found "very great cucumbers" grown on the site of what is now Montreal.[citation needed]

Early-modern age

trans,cis-2,6-Nonadienal, or cucumber aldehyde
Trans,cis-2,6-Nonadienal, or cucumber aldehyde, is a component of the distinctive aroma of cucumbers.

Throughout the 16th century, European trappers, traders, bison hunters, and explorers bartered for the products of American Indian agriculture. The tribes of the Great Plains and the Rocky Mountains learned from the Spanish how to grow European crops. The farmers on the Great Plains included the Mandan and Abenaki. They obtained cucumbers and watermelons from the Spanish, and added them to the crops they were already growing, including several varieties of corn and beans, pumpkins, squash, and gourd plants.[44] The Iroquois were also growing them when the first Europeans visited them.[45]

In 1630, the Reverend Francis Higginson produced a book called New-Englands Plantation in which, describing a garden on Conant's Island in Boston Harbor known as The Governor's Garden, he states:[46]

The countrie aboundeth naturally with store of roots of great varietie [sic] and good to eat. Our turnips, parsnips, and carrots are here both bigger and sweeter than is ordinary to be found in England. Here are store of pompions, cowcumbers, and other things of that nature which I know not...

In New England Prospect (1633, England), William Wood published observations he made in 1629 in America:[47]

The ground affords very good kitchin gardens, for Turneps, Parsnips, Carrots, Radishes, and Pompions, Muskmillons, Isquoter-squashes, coucumbars, Onyons, and whatever grows well in England grows as well there, many things being better and larger. [sic]

Age of Enlightenment and later

Lobster, Crab, and a Cucumber by William Henry Hunt (watercolour, 1826 or 1827)

In the later 17th century, a prejudice developed against uncooked vegetables and fruits. A number of articles in contemporary health publications stated that uncooked plants brought on summer diseases and should be forbidden to children. The cucumber kept this reputation for an inordinate period of time, "fit only for consumption by cows," which some believe is why it gained the name, cowcumber.[citation needed]

Samuel Pepys wrote in his diary on 22 August 1663:[48]

[T]his day Sir W. Batten tells me that Mr. Newburne is dead of eating cowcumbers, of which the other day I heard of another, I think.

John Evelyn in 1699 wrote that the cucumber, 'however dress'd, was thought fit to be thrown away, being accounted little better than poyson (poison)'.[49][50]

According to 18th-century British writer Samuel Johnson, it was commonly said among English physicians that a cucumber "should be well sliced, and dressed with pepper and vinegar, and then thrown out, as good for nothing."[51]

A copper etching made by Maddalena Bouchard between 1772 and 1793 shows this plant to have smaller, almost bean-shaped fruits, and small yellow flowers. The small form of the cucumber is figured in Herbals of the 16th century, however stating that "[i]f hung in a tube while in blossom, the Cucumber will grow to a most surprising length."[citation needed]

  • Salad cucumber
    Salad cucumber
  • An Indian yellow cucumber
    An Indian yellow cucumber
  • A Scandinavian cucumber in slices
    A Scandinavian cucumber in slices
  • Grated cucumber
    Grated cucumber
  • Komkommer (Cucumis sativus 'Gele Tros')
    Komkommer (Cucumis sativus 'Gele Tros')
  • A varietal grown by the Hmong people with textured skin and large seeds
    A varietal grown by the Hmong people with textured skin and large seeds
  • Lemon cucumber
    Lemon cucumber
  • Dish with cucumber cut pieces (mizeria)
    Dish with cucumber cut pieces (mizeria)
  • Pickling cucumbers
    Pickling cucumbers
  • Gherkins
    Gherkins
  • Isfahan burpless cucumber, Iran
    Isfahan burpless cucumber, Iran
  • Leaves
    Leaves
  • A tendril emerges from cucumber vines to facilitate climbing
    A tendril emerges from cucumber vines to facilitate climbing
  • A string lattice supports vine growth
    A string lattice supports vine growth
  • A bulb-shaped cucumber hanging on the vine
    A bulb-shaped cucumber hanging on the vine

See also

References

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  4. ^ Weng, Yiqun (7 January 2021). "Cucumis sativus Chromosome Evolution, Domestication, and Genetic Diversity: Implications for Cucumber Breeding". Plant Breeding Reviews. Wiley: 79–111. doi:10.1002/9781119717003.ch4.
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  34. ^ Bisht, I. S.; Bhat, K.V.; Tanwar, S. P. S.; Bhandari, D. C.; Joshi, Kamal; Sharma, A. K. (January 2004). "Distribution and genetic diversity of Cucumis sativus var. hardwickii (Royle) Alef in India". The Journal of Horticultural Science and Biotechnology. 79 (5): 783–791. doi:10.1080/14620316.2004.11511843. ISSN 1462-0316.
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