Template:Short description Template:About Template:Redirect Template:Speciesbox The onion (Allium cepa L., from Latin cepa "onion"), also known as the bulb onion or common onion, is a fruit that is the most widely cultivated species of the genus Allium. Its close relatives include the garlic, leek, chive,<ref name=Block2010>Template:Cite book</ref> and Chinese onion.<ref name="AN">Template:Cite web</ref>
This genus also contains several other species variously referred to as onions and cultivated for food, such as the Japanese bunching onion (Allium fistulosum), the tree onion (A. ×proliferum), and the Canada onion (Allium canadense). The name "wild onion" is applied to a number of Allium species, but A. cepa is exclusively known from cultivation. Its ancestral wild original form is not known, although escapes from cultivation have become established in some regions.<ref name="FNA">Template:EFloras</ref> The onion is most frequently a biennial or a perennial plant, but is usually treated as an annual and harvested in its first growing season.
The onion plant has a fan of hollow, bluish-green leaves and its bulb at the base of the plant begins to swell when a certain day-length is reached. The bulbs are composed of shortened, compressed, underground stems surrounded by fleshy modified scale (leaves) that envelop a central bud at the tip of the stem. In the autumn (or in spring, in the case of overwintering onions), the foliage dies down and the outer layers of the bulb become dry and brittle. The crop is harvested and dried and the onions are ready for use or storage. The crop is prone to attack by a number of pests and diseases, particularly the onion fly, the onion eelworm, and various fungi cause rotting. Some varieties of A. cepa, such as shallots and potato onions, produce multiple bulbs.
Onions are cultivated and used around the world. As a food item, they are usually served cooked, as a vegetable or part of a prepared savoury dish, but can also be eaten raw or used to make pickles or chutneys. They are pungent when chopped and contain certain chemical substances which irritate the eyes.
- 1 Taxonomy and etymology
- 2 Description
- 3 Uses
- 4 Composition
- 5 Cultivation
- 6 Varieties
- 7 Production
- 8 See also
- 9 References
- 10 Further reading
- 11 External links
Taxonomy and etymology
The onion plant (Allium cepa), also known as the bulb onion<ref name=GRIN>Template:GRIN</ref> or common onion,<ref name="Rabinowitch and Currah">Template:Cite book</ref> is the most widely cultivated species of the genus Allium.<ref name="Eric Block 2010">Eric Block, "Garlic and Other Alliums: The Lore and the Science" (Cambridge: Royal Society of Chemistry, 2010)</ref><ref>Template:Cite book</ref> It was first officially described by Carl Linnaeus in his 1753 work Species Plantarum.<ref>Template:Cite book</ref> A number of synonyms have appeared in its taxonomic history:
- Allium cepa var. aggregatum – G. Don
- Allium cepa var. bulbiferum – Regel
- Allium cepa var. cepa – Linnaeus
- Allium cepa var. multiplicans – L.H. Bailey
- Allium cepa var. proliferum – (Moench) Regel
- Allium cepa var. solaninum – Alef
- Allium cepa var. viviparum – (Metz) Mansf.<ref>Template:PLANTS</ref><ref>Template:ITIS</ref>
A. cepa is known exclusively from cultivation,<ref name="FNA" /> but related wild species occur in Central Asia. The most closely related species include A. vavilovii (Popov & Vved.) and A. asarense (R.M. Fritsch & Matin) from Iran.<ref name="prota">Grubben, G.J.H.; Denton, O.A. (2004) Plant Resources of Tropical Africa 2. Vegetables. PROTA Foundation, Wageningen; Backhuys, Leiden; CTA, Wageningen.</ref> However, Zohary and Hopf state that "there are doubts whether the A. vavilovii collections tested represent genuine wild material or only feral derivatives of the crop."<ref>Template:Cite book</ref>
The vast majority of cultivars of A. cepa belong to the "common onion group" (A. cepa var. cepa) and are usually referred to simply as "onions". The Aggregatum group of cultivars (A. cepa var. aggregatum) includes both shallots and potato onions.<ref name="Rabinowitch 20-21" />
The genus Allium also contains a number of other species variously referred to as onions and cultivated for food, such as the Japanese bunching onion (A. fistulosum), Egyptian onion (A. ×proliferum), and Canada onion (A. canadense).<ref name="Rabinowitch and Currah" />
Cepa is commonly accepted as Latin for "onion" and has an affinity with Ancient Greek: κάπια (kápia), Albanian: qepë, Aromanian: tseapã, Catalan: ceba, English: chive, Occitan: ceba, Spanish: cebolla, Old French: cive, and Romanian: ceapă.
The onion plant has been grown and selectively bred in cultivation for at least 7,000 years. It is a biennial plant, but is usually grown as an annual. Modern varieties typically grow to a height of Template:Convert. The leaves are yellowish- to bluish green and grow alternately in a flattened, fan-shaped swathe. They are fleshy, hollow, and cylindrical, with one flattened side. They are at their broadest about a quarter of the way up, beyond which they taper towards a blunt tip. The base of each leaf is a flattened, usually white sheath that grows out of a basal disc. From the underside of the disc, a bundle of fibrous roots extends for a short way into the soil. As the onion matures, food reserves begin to accumulate in the leaf bases and the bulb of the onion swells.<ref name=RHS />
In the autumn, the leaves die back and the outer scales of the bulb become dry and brittle, so the crop is then normally harvested. If left in the soil over winter, the growing point in the middle of the bulb begins to develop in the spring. New leaves appear and a long, stout, hollow stem expands, topped by a bract protecting a developing inflorescence. The inflorescence takes the form of a globular umbel of white flowers with parts in sixes. The seeds are glossy black and triangular in cross section.<ref name=RHS /> The average pH of an onion is around 5.5<ref>Template:Cite web</ref>
Origin and history
Because the wild onion is extinct and ancient records of using onions span western and eastern Asia, the geographic origin of the onion is uncertain,<ref name="cumo">Template:Cite book</ref><ref name="ansari">Template:Cite journal</ref> with likely domestication worldwide.<ref name=NOA/> Food uses of onions date back thousands of years in China, Egypt and Persia.<ref name=cumo/><ref name=ansari/><ref name=NOA>Template:Cite web</ref>
Traces of onions recovered from Bronze Age settlements in China suggest that onions were used as far back as 5000 BCE, not only for their flavour, but the bulb's durability in storage and transport.<ref>Onion History GillsOnions.com</ref><ref name=NOA/> Ancient Egyptians revered the onion bulb, viewing its spherical shape and concentric rings as symbols of eternal life.<ref name=NOA/> Onions were used in Egyptian burials, as evidenced by onion traces found in the eye sockets of Ramesses IV.<ref>Template:Cite journal</ref>
Pliny the Elder of the first century CE wrote about the use of onions and cabbage in Pompeii. He documented Roman beliefs about the onion's ability to improve ocular ailments, aid in sleep, and heal everything from oral sores and toothaches to dog bites, lumbago, and even dysentery. Archaeologists unearthing Pompeii long after its 79 CE volcanic burial have found gardens resembling those in Pliny's detailed narratives.<ref name=NOA/> According to texts collected in the fifth/sixth century CE under the authorial aegis of "Apicius" (said to have been a gourmet), onions were used in many Roman recipes.<ref name=NOA/>
In the Age of Discovery, onions were taken to North America by the first European settlers,<ref name=cumo/> only to discover the plant readily available, and in wide use in Native American gastronomy.<ref name=cumo/> According to diaries kept by certain of the first English colonists, the bulb onion was one of the first crops planted by the Pilgrim fathers.<ref name="NOA" />
Onion types and products
Common onions are normally available in three colour varieties. Yellow or brown onions (called red in some European countries), are full-flavoured and are the onions of choice for everyday use, with many cultivars bred specifically to demonstrate this sweetness (Vidalia, Walla Walla, Cévennes, "Bermuda,"<ref>Template:Cite web</ref> &c.). Yellow onions turn a rich, dark brown when caramelised and give French onion soup its sweet flavour. The red onion (called purple in some European countries) is a good choice for fresh use when its colour livens up the dish; it is also used in grilling. White onions are the traditional onions used in classic Mexican cuisine; they have a golden colour when cooked and a particularly sweet flavour when sautéed.<ref>Template:Cite web</ref><ref name=NOA/>
While the large, mature onion bulb is most often eaten, onions can be eaten at immature stages. Young plants may be harvested before bulbing occurs and used whole as spring onions or scallions. When an onion is harvested after bulbing has begun, but the onion is not yet mature, the plants are sometimes referred to as "summer" onions.<ref name="Thompson 1995 143">Template:Cite journal</ref>
Additionally, onions may be bred and grown to mature at smaller sizes. Depending on the mature size and the purpose for which the onion is used, these may be referred to as pearl, boiler, or pickler onions, but differ from true pearl onions which are a different species.<ref name="Thompson 1995 143" /> Pearl and boiler onions may be cooked as a vegetable rather than as an ingredient and pickler onions are often preserved in vinegar as a long-lasting relish.<ref>Template:Cite book</ref>
Onion powder is a seasoning widely used when the fresh ingredient is not available. It is made from finely ground, dehydrated onions, mainly the pungent varieties of bulb onions, and has a strong odour. Being dehydrated, it has a long shelf life and is available in several varieties: yellow, red, and white.<ref>Template:Cite web</ref>
Template:See also Onions are commonly chopped and used as an ingredient in various hearty warm dishes, and may also be used as a main ingredient in their own right, for example in French onion soup, creamed onions, and onion chutney. They are versatile and can be baked, boiled, braised, grilled, fried, roasted, sautéed, or eaten raw in salads.<ref name="bbc">Template:Cite web</ref> Their layered nature makes them easy to hollow out once cooked, facilitating stuffing them, as in Turkish sogan-dolma.
Onions pickled in vinegar are eaten as a snack around the world, and as a side serving in pubs and fish and chip shops throughout the United Kingdom and the Commonwealth. They are part of a traditional British pub's ploughman's lunch, usually served with crusty bread, English cheese, and ale.
Similar to garlic,<ref>Template:Cite journal</ref> onions can show an additional colour – pink-red – after cutting, an effect caused by reactions of amino acids with sulfur compounds.<ref>Template:Cite journal</ref>
Onions have particularly large cells that are readily observed under low magnification. Forming a single layer of cells, the bulb epidermis is easy to separate for educational, experimental, and breeding purposes.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>
Most onion cultivars are about 89% water, 9% carbohydrates (including 4% sugar and 2% dietary fibre), 1% protein, and negligible fat (table). Onions contain low amounts of essential nutrients and have an energy value of 166 kJ (40 Calories) in a 100 g (3.5 oz) amount. Onions contribute savoury flavour to dishes without contributing significant caloric content.<ref name=NOA/>
Considerable differences exist between onion varieties in phytochemical content, particularly for polyphenols, with shallots having the highest level, six times the amount found in Vidalia onions.<ref name="jafc" /> Yellow onions have the highest total flavonoid content, an amount 11 times higher than in white onions.<ref name="jafc" /> Red onions have considerable content of anthocyanin pigments, with at least 25 different compounds identified representing 10% of total flavonoid content.<ref name="jafc" />
Some people suffer from allergic reactions after handling onions.<ref>Template:Cite journal</ref> Symptoms can include contact dermatitis, intense itching, rhinoconjunctivitis, blurred vision, bronchial asthma, sweating, and anaphylaxis. Allergic reactions may not occur when eating cooked onions, possibly due to the denaturing of the proteins from cooking.<ref>Template:Cite journal</ref>
Freshly cut onions often cause a stinging sensation in the eyes of people nearby, and often uncontrollable tears. This is caused by the release of a volatile gas, syn-propanethial-S-oxide, which stimulates nerves in the eye.<ref name="Eric Block 2010" /> This gas is produced by a chain of reactions which serve as a defence mechanism: chopping an onion causes damage to cells which releases enzymes called alliinases. These break down amino acid sulfoxides and generate sulfenic acids. A specific sulfenic acid, 1-propenesulfenic acid, is rapidly acted on by a second enzyme, the lacrimatory factor synthase, producing the syn-propanethial-S-oxide.<ref name="Eric Block 2010" /> This gas diffuses through the air and soon reaches the eyes, where it activates sensory neurons. Lacrimal glands produce tears to dilute and flush out the irritant.<ref name="Sciam">Template:Cite web</ref>
Eye irritation can be avoided by cutting onions under running water or submerged in a basin of water.<ref name="Sciam" /> Leaving the root end intact also reduces irritation as the onion base has a higher concentration of sulphur compounds than the rest of the bulb.<ref name=FAQ>Template:Cite web</ref> Refrigerating the onions before use reduces the enzyme reaction rate and using a fan can blow the gas away from the eyes. The more often one chops onions, the less one experiences eye irritation.<ref>Template:Cite web</ref>
The amount of sulfenic acids and lacrimal factor released and the irritation effect differs among Allium species. In 2008, the New Zealand Institute for Crop and Food Research created "no tears" onions by genetic modification to prevent the synthesis of lachrymatory factor synthase in onions.<ref>Template:Cite web</ref> One study suggests that consumers prefer the flavor of onions with lower LFS content.<ref>Template:Cite journal</ref> However, since the LFS-silencing process involves reducing sulfur ingestion by the plant, it has also been suggested that LFS− onions are inferior in flavor.<ref>Template:Cite journal</ref> A method for efficiently differentiating LFS− and LFS+ onions has been developed based on mass spectrometry, with potential application in high-volume production;<ref>Template:Cite journal</ref> gas chromatography is also used to measure lachrymatory factor in onions.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> In early 2018, Bayer released the first crop yield of commercially-available LFS-silenced onions under the name "Sunions."<ref name=":0">Template:Cite news</ref> They were the product of 30 years of cross-breeding; genetic modification was not employed.<ref name=":0" /><ref>Template:Cite news</ref>
Guinea hen weed and honey garlic contain a similar lachrymatory factor.<ref>Template:Cite news</ref> Synthetic onion lachrymatory factor has been used in a study related to tear production,<ref>Higashihara, H., Yokoi, N., Aoyagi, M. et al. Jpn J Ophthalmol (2010) 54: 215. https://doi-org.proxy.lib.umich.edu/10.1007/s10384-009-0786-0</ref> and has been proposed as a nonlethal deterrent against thieves and intruders.<ref>Template:Cite patent</ref><ref>Template:Cite patent</ref>
Onions are best cultivated in fertile soils that are well-drained. Sandy loams are good as they are low in sulphur, while clayey soils usually have a high sulphur content and produce pungent bulbs. Onions require a high level of nutrients in the soil. Phosphorus is often present in sufficient quantities, but may be applied before planting because of its low level of availability in cold soils. Nitrogen and potash can be applied at regular intervals during the growing season, the last application of nitrogen being at least four weeks before harvesting.<ref>Template:Cite web</ref> Bulbing onions are day-length sensitive; their bulbs begin growing only after the number of daylight hours has surpassed some minimal quantity. Most traditional European onions are referred to as "long-day" onions, producing bulbs only after 14 hours or more of daylight occurs. Southern European and North African varieties are often known as "intermediate-day" types, requiring only 12–13 hours of daylight to stimulate bulb formation. Finally, "short-day" onions, which have been developed in more recent times, are planted in mild-winter areas in the autumn and form bulbs in the early spring, and require only 11–12 hours of daylight to stimulate bulb formation.<ref>Template:Cite web</ref> Onions are a cool-weather crop and can be grown in USDA zones 3 to 9.<ref name=almanac /> Hot temperatures or other stressful conditions cause them to "bolt", meaning that a flower stem begins to grow.<ref>Template:Cite web</ref>
Onions may be grown from seed or from sets. Onion seeds are short-lived and fresh seeds germinate better.<ref name=almanac>Template:Cite web</ref><ref>Template:Cite web</ref> The seeds are sown thinly in shallow drills, thinning the plants in stages. In suitable climates, certain cultivars can be sown in late summer and autumn to overwinter in the ground and produce early crops the following year.<ref name=RHS /> Onion sets are produced by sowing seed thickly in early summer in poor soil and the small bulbs produced are harvested in the autumn. These bulbs are planted the following spring and grow into mature bulbs later in the year.<ref name=PFAF>Template:PFAF</ref> Certain cultivars are used for this purpose and these may not have such good storage characteristics as those grown directly from seed.<ref name=RHS>Template:Cite book</ref>
Routine care during the growing season involves keeping the rows free of competing weeds, especially when the plants are young. The plants are shallow-rooted and do not need a great deal of water when established. Bulbing usually takes place after 12 to 18 weeks. The bulbs can be gathered when needed to eat fresh, but if they will be kept in storage, they should be harvested after the leaves have died back naturally. In dry weather, they can be left on the surface of the soil for a few days to dry out properly, then they can be placed in nets, roped into strings, or laid in layers in shallow boxes. They should be stored in a well-ventilated, cool place such as a shed.<ref name=RHS />
Pests and diseases
Onions suffer from a number of plant disorders. The most serious for the home gardener are likely to be the onion fly, stem and bulb eelworm, white rot, and neck rot. Diseases affecting the foliage include rust and smut, downy mildew, and white tip disease. The bulbs may be affected by splitting, white rot, and neck rot. Shanking is a condition in which the central leaves turn yellow and the inner part of the bulb collapses into an unpleasant-smelling slime. Most of these disorders are best treated by removing and burning affected plants.<ref name=Hessayon>Template:Cite book</ref> The larvae of the onion leaf miner or leek moth (Acrolepiopsis assectella) sometimes attack the foliage and may burrow down into the bulb.<ref>Template:Cite journal</ref>
The onion fly (Delia antiqua) lays eggs on the leaves and stems and on the ground close to onion, shallot, leek, and garlic plants. The fly is attracted to the crop by the smell of damaged tissue and is liable to occur after thinning. Plants grown from sets are less prone to attack. The larvae tunnel into the bulbs and the foliage wilts and turns yellow. The bulbs are disfigured and rot, especially in wet weather. Control measures may include crop rotation, the use of seed dressings, early sowing or planting, and the removal of infested plants.<ref>Template:Cite web</ref>
The onion eelworm (Ditylenchus dipsaci), a tiny parasitic soil-living nematode, causes swollen, distorted foliage. Young plants are killed and older ones produce soft bulbs. No cure is known and affected plants should be uprooted and burned. The site should not be used for growing onions again for several years and should also be avoided for growing carrots, parsnips, and beans, which are also susceptible to the eelworm.<ref>Template:Cite web</ref>
White rot of onions, leeks, and garlic is caused by the soil-borne fungus Sclerotium cepivorum. As the roots rot, the foliage turns yellow and wilts. The bases of the bulbs are attacked and become covered by a fluffy white mass of mycelia, which later produces small, globular black structures called sclerotia. These resting structures remain in the soil to reinfect a future crop. No cure for this fungal disease exists, so affected plants should be removed and destroyed and the ground used for unrelated crops in subsequent years.<ref>Template:Cite web</ref>
Neck rot is a fungal disease affecting onions in storage. It is caused by Botrytis allii, which attacks the neck and upper parts of the bulb, causing a grey mould to develop. The symptoms often first occur where the bulb has been damaged and spread downwards in the affected scales. Large quantities of spores are produced and crust-like sclerotia may also develop. In time, a dry rot sets in and the bulb becomes a dry, mummified structure. This disease may be present throughout the growing period, but only manifests itself when the bulb is in storage. Antifungal seed dressings are available and the disease can be minimised by preventing physical damage to the bulbs at harvesting, careful drying and curing of the mature onions, and correct storage in a cool, dry place with plenty of circulating air.<ref>Template:Cite web</ref>
Storage in the home
Cooking onions and sweet onions are better stored at room temperature, optimally in a single layer, in mesh bags in a dry, cool, dark, well-ventilated location. In this environment, cooking onions have a shelf life of three to four weeks and sweet onions one to two weeks. Cooking onions will absorb odours from apples and pears. Also, they draw moisture from vegetables with which they are stored which may cause them to decay.<ref name=almanac /><ref name=Jauron>Template:Cite web</ref>
Sweet onions have a greater water and sugar content than cooking onions. This makes them sweeter and milder tasting, but reduces their shelf life. Sweet onions can be stored refrigerated; they have a shelf life of around 1 month. Irrespective of type, any cut pieces of onion are best tightly wrapped, stored away from other produce, and used within two to three days.<ref name=FAQ />
Common onion group (var. cepa)
Most of the diversity within A. cepa occurs within this group, the most economically important Allium crop. Plants within this group form large single bulbs, and are grown from seed or seed-grown sets. The majority of cultivars grown for dry bulbs, salad onions, and pickling onions belong to this group.<ref name="Rabinowitch 20-21">Template:Cite book</ref> The range of diversity found among these cultivars includes variation in photoperiod (length of day that triggers bulbing), storage life, flavour, and skin colour.<ref>Template:Cite book</ref> Common onions range from the pungent varieties used for dried soups and onion powder to the mild and hearty sweet onions, such as the Vidalia from Georgia, USA, or Walla Walla from Washington that can be sliced and eaten raw on a sandwich.
Aggregatum group (var. aggregatum)
This group contains shallots and potato onions, also referred to as multiplier onions. The bulbs are smaller than those of common onions, and a single plant forms an aggregate cluster of several bulbs from a master. They are propagated almost exclusively from daughter bulbs, although reproduction from seed is possible. Shallots are the most important subgroup within this group and comprise the only cultivars cultivated commercially. They form aggregate clusters of small, narrowly ovoid to pear-shaped bulbs. Potato onions differ from shallots in forming larger bulbs with fewer bulbs per cluster, and having a flattened (onion-like) shape. However, intermediate forms exist.<ref name="Rabinowitch 20-21" />
I'itoi onion is a prolific multiplier onion cultivated in the Baboquivari Peak Wilderness, Arizona area. This small-bulb type has a shallot-like flavour and is easy to grow and ideal for hot, dry climates. Bulbs are separated, and planted in the fall 1 in below the surface and 12 in apart. Bulbs will multiply into clumps and can be harvested throughout the cooler months. Tops die back in the heat of summer and may return with heavy rains; bulbs can remain in the ground or be harvested and stored in a cool dry place for planting in the fall. The plants rarely flower; propagation is by division.<ref>Template:Cite web</ref>
Hybrids with A. cepa parentage
The tree onion or Egyptian onion produces bulblets in the umbel instead of flowers, and is now known to be a hybrid of A. cepa and A. fistulosum. It has previously been treated as a variety of A. cepa, for example A. cepa var. proliferum, A. cepa var. bulbiferum, and A. cepa var. viviparum.<ref>Template:GRIN</ref><ref name="Rabinowitch 19">Template:Cite book</ref> It has been grown for centuries in Japan and China for use as a salad onion.<ref>Template:Cite book</ref><ref name="Rabinowitch and Currah" />
The triploid onion is a hybrid species with three sets of chromosomes, two sets from A. cepa and the third set from an unknown parent.<ref name="Rabinowitch 19" /> Various clones of the triploid onion are grown locally in different regions, such as 'Ljutika' in Croatia, and 'Pran', 'Poonch', and 'Srinagar' in the India-Kashmir region. 'Pran' is grown extensively in the northern Indian provinces of Jammu and Kashmir. There are very small genetic differences between 'Pran' and the Croatian clone 'Ljutika', implying a monophyletic origin for this species.<ref>Template:Cite journal</ref>
Some authors have used the name A. cepa var. viviparum (Metzg.) Alef. for the triploid onion, but this name has also been applied to the Egyptian onion. The only name unambiguously connected with the triploid onion is A. ×cornutum.
Spring onions or salad onions may be grown from the Welsh onion (A. fistulosum), as well as from A. cepa. Young plants of A. fistulosum and A. cepa look very similar, but may be distinguished by their leaves, which are circular in cross-section in A. fistulosum rather than flattened on one side.<ref>Template:Cite book</ref>
|Onions (dried) production in 2016|
|Country||(millions of tonnes)|
In 2016, world production of dried onions was 93.2 million tonnes, led by China and India producing 26% and 21% of the total, respectively.<ref name=faostat2016/>
The Onion Futures Act, passed in 1958, bans the trading of futures contracts on onions in the United States. This prohibition came into force after farmers complained about alleged market manipulation by Sam Siegel and Vincent Kosuga at the Chicago Mercantile Exchange two years earlier. The subsequent investigation provided economists with a unique case study into the effects of futures trading on agricultural prices. The act remains in effect Template:As of.<ref>Template:Cite web</ref>
- Template:Cite book
- Gripshover, Margaret M., and Thomas L. Bell, "Patently Good Ideas: Innovations and Inventions in U.S. Onion Farming, 1883–1939," Material Culture (Spring 2012), vol 44 pp 1–30.
- Sen, Colleen T. (2004). Food culture in India. Greenwood Publishing. Template:ISBN.