The carrot (Daucus carota subsp. sativus, Etymology: from Late Latin carōta, from Greek καρότον karōton, originally from the Indo-European root ker- (horn), due to its horn-like shape) is a root vegetable, usually orange in colour, though purple, red, white, and yellow varieties exist. It has a crisp texture when fresh. The most commonly eaten part of a carrot is a taproot, although the greens are edible as well. It is a domesticated form of the wild carrot Daucus carota, native to Europe and southwestern Asia. The domestic carrot has been selectively bred for its greatly enlarged and more palatable, less woody-textured edible taproot.

Description

Wild carrot in its natural habitat

It is a biennial plant which grows a rosette of leaves in the spring and summer, while building up the stout taproot, which stores large amounts of sugars for the plant to flower in the second year. The flowering stem grows to about 1 metre (3 ft) tall, with an umbel of white flowers that produce a fruit called a mericarp by botanists, which is a type of schizocarp.^[1]

Methods of consumption and uses

Carrots can be eaten in a variety of ways. Only 3% of the β-carotene in raw carrots is released during digestion: this can be improved to 39% by pulping, cooking and adding cooking oil.^[2] Alternatively they may be chopped and boiled, fried or steamed, and cooked in soups and stews, as well as baby and pet foods. A well known dish is carrots julienne. The greens are edible as a leaf vegetable, but are rarely eaten by humans. Together with onion and celery, carrots are one of the primary vegetables used in a mirepoix to make various broths.

In India carrots are used in a variety of ways, as salads or as vegetables added to spicy rice or daal dishes. The most popular variation in north India is the Gaajar Kaa Halwaa carrot dessert, which has carrots grated and cooked in milk until the whole mixture is solid, after which nuts and butter are added. Carrot salads are usually made with grated carrots in western parts with a seasoning of mustard seeds and green chillies popped in hot oil, while adding carrots to rice usually is in julienne shape.

The variety of carrot found in north India is rare everywhere except in Central Asia and other contiguous regions, and is now growing in popularity in larger cosmopolitan cities in South India. The north Indian carrot is pink-red comparable to plum or raspberry or deep red apple in colour (without a touch of yellow or blue) while most other carrot varieties in world are from orange to yellow in colour, comparable to hallowe'en pumpkins.

Ever since the late 1980s, baby carrots or mini-carrots (carrots that have been peeled and cut into uniform cylinders) have been a popular ready-to-eat snack food available in many supermarkets.

The sweetness of carrots allows the vegetable to be used in some fruit-like roles. Grated carrots are used in carrot cakes, as well as carrot puddings, an old English dish thought to have originated in the early 19th century. Carrots can also be used alone or with fruits in jam and preserves. Carrot juice is also widely marketed, especially as a health drink, either stand-alone or blended with fruits and other vegetables.

Companion plant

Carrots are useful companion plants for gardeners. There is experimental evidence^{[citation needed]} that growing it intercropped with tomatoes increases tomato production. If left to flower, it (like any umbellifer) attracts predatory wasps which kill many garden pests.

Nutrition

Carrot tzimmes

β-Carotene structure. Carotene is responsible for the orange colour of carrots and many other fruits and vegetables.

The carrot gets its characteristic and bright orange colour from β-carotene, which is metabolised into vitamin A in humans when bile salts are present in the intestines.^[3] Massive overconsumption of carrots can cause carotenosis, a benign condition in which the skin turns orange. Carrots are also rich in dietary fibre, antioxidants, and minerals.

Lack of vitamin A can cause poor vision, including night vision, and vision can be restored by adding it back into the diet. An urban legend says eating large amounts of carrots will allow one to see in the dark. The legend developed from stories of British gunners in World War II, who were able to shoot down German planes in the darkness of night. The legend arose during the Battle of Britain when the RAF circulated a story about their pilots' carrot consumption as an attempt to cover up the discovery and effective use of radar technologies in engaging enemy planes, as well as the use of red light (which does not destroy night vision) in aircraft instruments.^[4][5] It reinforced existing German folklore and helped to encourage Britons—looking to improve their night vision during the blackouts—to grow and eat the vegetable.

Ethnomedically, the roots are used to treat digestive problems, intestinal parasites, and tonsillitis or constipation.

Chemistry

Polyacetylenes can be found in Apiaceae vegetables like carrots where they show cytotoxic activities.^[6][7] Falcarinol and falcarindiol (cis-heptadeca-1,9-diene-4,6-diyne-3,8-diol)^[8] are such compounds. This latter compound shows antifungal activity towards Mycocentrospora acerina and Cladosporium cladosporioides.^[8]

Other compounds such as 6-methoxymellein, eugenin, 2,4,5-trimethoxybenzaldehyde (gazarin) or (Z)-3-acetoxy-heptadeca-1,9-diene-4,6-diin-8-ol (falcarindiol 3-acetate) can also be found in carrot. Falcarindiol is the main compound responsible for bitterness in carrots.^[9]

History

Workers harvesting carrots, Imperial Valley, California, 1948

A basket of carrots displayed in a Singapore supermarket.

The wild ancestors of the carrot are likely to have come from Iran and Afghanistan, which remains the centre of diversity of D. carota, the wild carrot. Selective breeding over the centuries of a naturally occurring subspecies of the wild carrot, Daucus carota subsp. sativus, to reduce bitterness, increase sweetness and minimise the woody core, has produced the familiar garden vegetable.^[10][11]

In early use, carrots were grown for their aromatic leaves and seeds, not their roots. Some relatives of the carrot are still grown for these, such as parsley, fennel, dill and cumin. The first mention of the root in classical sources is in the 1st century. The modern carrot appears to have been introduced to Europe in the 8–10th centuries.^{[citation needed]} The 12th c. Arab Andalusian agriculturist, Ibn al-'Awwam, describes both red and yellow carrots; Simeon Seth also mentions both colours in the 11th century. Orange-coloured carrots appeared in the Netherlands in the 17th century.^[12] These, the modern carrots, were intended by the antiquary John Aubrey (1626–1697) when he noted in his memoranda "Carrots were first sown at Beckington in Somersetshire Some very old Man there [in 1668] did remember their first bringing hither."^[13]

In addition to wild carrot, these alternative (mostly historical) names are recorded for Daucus carota: bee's-nest, bee's-nest plant, bird's-nest, bird's-nest plant, bird's-nest root, carota, carotte (French), carrot, common carrot, crow's-nest, daucon, dawke, devil's-plague, fiddle, gallicam, garden carrot, gelbe Rübe (German), gingidium, hill-trot, laceflower, mirrot, Möhre (German), parsnip (misapplied), Queen Anne's lace, rantipole, staphylinos, and zanahoria (Spanish).^[14]

Cultivation

Left frame

Right frame

Parallel view

Cross-eye view

Carrot seeds

Carrots grow best in full sun but tolerate some shade^[15] In order to avoid growing deformed carrots it is better to plant them in loose soil free from rocks. The seeds, which are 1-3mm in diameter, should be sown about 2cm deep. Carrots take around 4 months to mature and it is suggested that carrot seeds are sown from mid - February to July.

Cultivars

Carrots come in a wide variety of shapes, colors and sizes

Carrots with multiple taproots (forks) are not specific cultivars but are a byproduct of damage to earlier forks often associated with rocky soil.

Carrots can be selectively bred to produce different colours.

Carrot cultivars can be grouped into two broad classes, eastern carrots and western carrots. More recently, a number of novelty cultivars have been bred for particular characteristics.

The city of Holtville, California, promotes itself as "Carrot Capital of the World", and holds an annual festival devoted entirely to the carrot.

Eastern carrots

Eastern carrots were domesticated in Central Asia, probably in modern-day Iran and Afghanistan in the 10th century, or possibly earlier. Specimens of the eastern carrot that survive to the present day are commonly purple or yellow, and often have branched roots. The purple colour common in these carrots comes from anthocyanin pigments.

Western carrots

The western carrot emerged in the Netherlands in the 17th century,^[16] from Iran with violet colour, its orange colour making it popular in those countries as an emblem of the House of Orange and the struggle for Dutch independence. The orange colour results from abundant carotenes in these cultivars.

Western carrot cultivars are commonly classified by their root shape:

• Chantenay carrots are shorter than other cultivars, but have greater girth, sometimes growing up to 8 centimetres (3 in) in diameter. They have broad shoulders and taper towards a blunt, rounded tip. They are most commonly diced for use in canned or prepared foods.
• Danvers carrots have a conical shape, having well-defined shoulders and tapering to a point at the tip. They are somewhat shorter than Imperator cultivars, but more tolerant of heavy soil. Danvers cultivars are often puréed as baby food. They were developed in 1871 in Danvers, Ma.^[17]

One particular variety lacks the usual orange pigment from carotenes, owing its white colour to a recessive gene for tocopherol (vitamin E)^[18]. Derived from Daucus carota L. and patented at the University of Wisconsin–Madison^[18], the variety is intended to supplement the dietary intake of Vitamin E.^[19]

Production trends

Carrot and Turnip output in 2005. Green: largest producer (China). Yellow: other major producers. Red: minor producers

In 2009, according to the Food and Agriculture Organization, 33.582 million tonnes of carrots and turnips were produced worldwide. With 15.168 million tonnes, China was by far the largest producer and accounted for 45.2 % of the global output, followed by Russia (1.518 million tonnes) and the United States (1.304 million tonnes).^[20]

Carrot weighing and packing machine in The Netherlands

Storage

Carrots can be stored for several months in the refrigerator or over winter in moist sand in a cool place.^[21][22]

See also

Carrot sprouts 11 days after being sown in a sand-based seed germinator. A 10 cent euro coin was placed on the soil to serve as a scale.

References