Various forms of wild carrot (usually treated as different subspecies and/or varieties of Daucus carota), occur as natives across much of western Asia and Europe. Their pale roots are small and have an unpleasant taste. In contrast, Daucus carota sativus, the domesticated carrot, which was already mentioned in classical texts two millenia ago, has enlarged roots which can taste quite sweet. The domesticated carrot arose in the Near East, in the region between Afghanistan and Turkey. In its early form, it had dark purple roots that were often branched. Orange, carotene-colored forms developed later and are illustrated in a Byzantine herbal from 512 A.D. In the 17th century, carrots were developed in the Netherlands with denser orange carotene pigment and these were the progenitors of the modern cultivated carrot (Vaughan and Geissler 1997). These orange forms soon replaced the purple ones in Europe and the Mediterranean. Carrots are eaten both raw and cooked and are used in both savory and sweet dishes. In Asia, they are often preserved in jams and syrups. (Sanderson 2005)
The domesticated carrot (Daucus carota sativus) is easily recognized by its highly pigmented, fleshy, edible, brittle roots. In wild carrots, fresh roots are flexible and fibrous (brittle and not fibrous in domesticated forms), the transition from shoot to storage organ is indistinct externally (the storage organ--the "carrot"--is abruptly expanded in domesticated forms), rosette foliage is often prostrate (usually conspicuously erect in domesticated forms), and umbels often have one or several purple central flowers (rarely in domesticated forms). Cultivated carrots with white roots are occasionally encountered, but relative to wild carrots these roots are palatable and brittle and are unbranched.
Within the subspecies D. c. sativus, two varieties are sometimes recognized: The "Western Carrot" (variety sativus) and the "Eastern Carrot" (variety atrorubens). The Western Carrot may have orange, yellow, or white storage organs and is best characterized by yellowish-green highly dissected foliage that mostly lacks pubescence. The Western Carrot is grown around the world and with the exception of Asia is the main variety cultivated. The Eastern Carrot usually has purple and/or yellow storage organs. Occasionally, roots are reddish or yellowish-orange. The Eastern Carrot is characterized by grayish-green (glaucous) and only moderately dissected foliage that is moderately pubescent. The Eastern Carrot is common only in Asia, but it has been introduced elsewhere. Although one might expect the interesting colors of this variety to confer commercial value in Western markets at least as a novelty, the fact that the pigments are water soluble, like those of beets, seems to have limited its appeal in the West (but see Surles et al. 2004). Furthermore, these carrots may be more susceptible to decay. It is important to realize that this varietal taxonomy is somewhat artificial. For example, in Asia, where there has been considerable genetic mixing between these forms, plants with intermediate characteristics are commonly encountered. Some of these varietal hybrids have even found commercial success in the West. (IPGRI 1998)
Various forms of wild carrot (usually treated as different subspecies and/or varieties of Daucus carota), occur as natives across much of western Asia and Europe. Their pale roots are small and have an unpleasant taste. In contrast, Daucus carota sativus, the domesticated carrot, which was already mentioned in classical texts two millenia ago, has enlarged roots which can taste quite sweet. The domesticated carrot arose in the Near East, in the region between Afghanistan and Turkey. In its early form, it had dark purple roots that were often branched. Orange, carotene-colored forms developed later and are illustrated in a Byzantine herbal from 512 A.D. By the 17th century, the orange forms had replaced the purple ones in Europe and the Mediterranean. Carrots are eaten both raw and cooked and are used in both savory and sweet dishes. In Asia, they are often preserved in jams and syrups. (Sanderson 2005)
The cultivated carrot is believed to have originated in Afghanistan from forms with roots colored purple by anthocyanins (as well as yellow mutants lacking anthocyanins). These forms spread to the west and east, reaching Asia Minor around the 10th or 11th centuries, Arab-occupied Spain in the 12th century, continental northwestern Europe in the 14th century, England in the 15th century, China in the 14th century, and Japan in the 17th century. Before and during the 16th century, carrots in northwestern Europe were purple or yellow with long roots. The yellow roots were often preferred because they did not release anthocyanins during cooking. In the 17th century, carrots were developed in the Netherlands with denser orange carotene pigment and these were the progenitors of the modern cultivated carrot. Carrots are well known as an excellent source of provitamin A and contain around 7% sugar (glucose, fructose, sucrose) (the nutritional and health value and potential of carrots are reviewed by Arscott and Tanumihardjo 2010 and the influence of carrot genetic background on the content of various nutrients was studied by Nicolle et al. 2004; for additional information about the health benefits of different carrot pigments, see this page at the USDA Agricultural Research Service). The inflorescence is a terminal umbel (a broad, flat inflorescence) of small white flowers, with the umbel subtended by bracts. (Vaughan and Geissler 1997)
The domesticated carrot (Daucus carota sativus) is easily recognized by its highly pigmented, fleshy, edible, brittle roots. In wild carrots, fresh roots are flexible and fibrous (brittle and not fibrous in domesticated forms), the transition from shoot to storage organ is indistinct externally (the storage organ--the "carrot"--is abruptly expanded in domesticated forms), rosette foliage is often prostrate (usually conspicuously erect in domesticated forms), and umbels often have one or several purple central flowers (rarely in domesticated forms). Cultivated carrots with white roots are occasionally encountered, but relative to wild carrots these roots are palatable and brittle and are unbranched. Within the subspecies D. c. sativus, two varieties are sometimes recognized: The "Western Carrot" (variety sativus) and the "Eastern Carrot" (variety atrorubens). The Western Carrot may have orange, yellow, or white storage organs and is best characterized by yellowish-green highly dissected foliage (ultimate segments linear-lanceolate to linear, penultimate segments cleft more than two thirds toward the midrib) that mostly lacks pubescence (fewer than 50 hairs per square millimeter on either abaxial petiole or abaxial leaflets). The Western Carrot is grown around the world and with the exception of Asia is the main variety cultivated. The Eastern Carrot usually has purple and/or yellow storage organs. Occasionally, roots are reddish or yellowish-orange. The Eastern Carrot is characterized by grayish-green (glaucous) and only moderately dissected foliage (ultimate segments lanceolate to ovate, penultimate segments cleft less than two thirds toward the midrib) which is moderately pubescent (more than 50 hairs per square millimeter on either abaxial petiole or abaxial leaflets). The Eastern Carrot is common only in Asia, but it has been introduced elsewhere. Although one might expect the interesting colors of this variety to confer commercial value in Western markets at least as a novelty, the fact that the pigments are water soluble, like those of beets, seems to have limited its appeal in the West (but see Surles et al. 2004). Furthermore, these carrots may be more susceptible to decay. It is important to realize that this varietal taxonomy is somewhat artificial. For example, in Asia, where there has been considerable genetic mixing between these forms, plants with intermediate characteristics are commonly encountered. Some of these varietal hybrids have even found commercial success in the West. (IPGRI 1998)
As one of the most popular vegetables worldwide and the main source of dietary provitamin A, the cultivated carrot has increasingly become a focus for the development of genetically modified forms. Genetically modified (GM) carrots have already been developed that have antifungal activities, herbicide and salt tolerance, and increased nutritional benefits. (Rong et al. 2010 and references therein) They have even been used for the production of drugs (Luchakivskaya et al. 2011 and references therein). Although as of 2010, none of these GM varieties were yet in commercial production (Rong et al. 2010), commercial trials seem likely and with this in mind, Rong et al. used microsatellite marker analysis to explore the fine-scale genetic structure, mating, and gene dispersal in wild carrot. They found high rates of outcrossing and long-distance pollen dispersal among wild carrots, suggesting that the likelihood of transgene flow among carrot populations is high (previous work by other researchers has shown that cultivated and wild carrots interbreed freely). They note that if such transgenes have positive fitness effects on wild carrots, they could easily spread within and between wild populations via pollen dispersal. Magnussen and Hauser (2007), using AFLP markers, found genetic evidence of hybridization between cultivated and wild carrots in wild populations growing in proximity to carrot fields in Denmark. They also found evidence that continued hybridization and introgression has made wild populations close to carrot fields at least somewhat more similar genetically to cultivars than are wild populations farther away from carrot fields. Rong et al. suggest that the fitness of specific transgenes in F1 hybrids and subsequent backcrossing generations in wild carrot populations needs to be assessed to determine whether the risks of transgene introgression are indeed relatively high in carrot.
Clotault et al. (2010) studied the variation in genes incolved in the synthesis of carotenoids in carrots. They examined seven candidate genes involved in the carotenoid biosynthesis pathway in 48 individual plants, each one from a different carrot cultivar (cultivars were chosen to represent a wide range of root colors). Analysis of these genes, along with 17 putatively neutral microsatellite markers, showed moderate genetic differentiation between cultivars originating from the West and the East (no such structure had been evident in previous molecular genetic analyses using various types of markers) (Clotault et al. 2010 and references therein). The carrot is believed to originate in Afghanistan before the 900s, as this area is described as the primary center of greatest carrot diversity, with Turkey proposed as a secondary centre of origin. The first cultivated carrots had purple or yellow roots. Carrot cultivation spread to Spain in the 1100s via the Middle East and North Africa. In Europe, breeding efforts produced a wide variety of cultivars. White and orange-colored carrots were first described in Western Europe in the early 1600s. At the same time, the Asian carrot was developed from the Afghan type and a red type appeared in China and India around the 1700s. Carotenoid composition determines the white, yellow, orange or red root color in the carrot. (Clotault et al. 2010 and references therein)
The domesticated carrot (D. carota sativus) is grown around the world. Wild carrot (D. carota carota), also known as Queen Anne’s lace, is native to temperate regions of Europe and western Asia, and has been introduced into America, New Zealand, Australia and Japan (Rong et al. 2010 and references therein).
colony of Alternaria dematiaceous anamorph of Alternaria dauci infects and damages yellowed then brown to black petiole of Daucus carota ssp. sativus
Foodplant / spot causer
effuse colony of Alternaria dematiaceous anamorph of Alternaria radicina causes spots on live leaf (petiole) of Daucus carota ssp. sativus
In Great Britain and/or Ireland:
Foodplant / pathogen
Armillaria mellea s.l. infects and damages Daucus carota ssp. sativus
Foodplant / pathogen
Carrot Mottle virus (CMoV) infects and damages reddened, chlorotic and often mottled leaf of Daucus carota ssp. sativus
Foodplant / pathogen
Carrot red leaf associated RNA (CtRLVaRNA) infects and damages reddened, chlorotic and often mottled leaf of Daucus carota ssp. sativus
Foodplant / pathogen
Carrot Red Leaf virus (CtRLV) infects and damages reddened, chlorotic and often mottled leaf of Daucus carota ssp. sativus
Foodplant / parasite
colony of Chalaropsis dematiaceous anamorph of Ceratocystis paradoxa parasitises blackened root (prepared) of Daucus carota ssp. sativus
Foodplant / pathogen
Cercospora anamorph of Cercospora carotae infects and damages live leaf of Daucus carota ssp. sativus
Foodplant / internal feeder
larva of Chamaepsila rosae feeds within live root of Daucus carota ssp. sativus
Foodplant / gall
Cuscuta campestris causes gall of Daucus carota ssp. sativus
Other: major host/prey
Animal / pathogen
Rhizoctonia anamorph of Helicobasidium purpureum infects root of Daucus carota ssp. sativus
Other: major host/prey
Foodplant / gall
Heterodera carotae causes gall of cysted root of Daucus carota ssp. sativus
Foodplant / gall
Meloidogyne causes gall of root of Daucus carota ssp. sativus
Other: minor host/prey
Foodplant / pathogen
colony of Mycocentrospora anamorph of Mycocentrospora acerina infects and damages live root (crown) of Daucus carota ssp. sativus
Foodplant / pathogen
Parsnip Yellow Fleck virus (PYFV) infects and damages mottled leaf of Daucus carota ssp. sativus
Foodplant / parasite
hypophyllous colony of sporangium of Plasmopara crustosa parasitises live leaf of Daucus carota ssp. sativus
Foodplant / pathogen
colony of Rhexocercosporidium anamorph of Rhexocercosporidium carotae infects and damages stored foliage of Daucus carota ssp. sativus
Foodplant / pathogen
colony of Mycocentrospora dematiaceous anamorph of Thanatephorus cucumeris infects and damages live root of Daucus carota ssp. sativus
Foodplant / pathogen
colony of Thielaviopsis dematiaceous anamorph of Thielaviopsis basicola infects and damages blackened, rotting root of Daucus carota ssp. sativus
Molecular Biology and Genetics
Barcode data: Daucus carota subsp sativus
Statistics of barcoding coverage: Daucus carota subsp sativus
Public Records: 1
Specimens with Barcodes: 1
Species With Barcodes: 1
Relevance to Humans and Ecosystems
Carrots and other vegetables can be used in ways most people have never even thought of, e.g., as musical instruments, as seen and heard here.
Umehara et al. (2005) showed that wild and cultivated carrots can produce vigorous hybrid offspring and developed genetic markers that could be useful in tracing introgression of genes from cultivated carrots into wild populations. Such introgression is of particular concern in considering the possible risks of genes inserted into cultivated varieties escaping into wild populations and creating "superweeds" or other problems.
The carrot (Daucus carota subsp. sativus) 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 sometimes eaten 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. The Food and Agriculture Organization of the United Nations (FAO) reports that world production of carrots and turnips (these plants are combined by the FAO for reporting purposes) for calendar year 2011 was almost 35.658 million tonnes. Almost half were grown in China. Carrots are widely used in many cuisines, especially in the preparation of salads, and carrot salads are a tradition in many regional cuisines.
The word is first recorded in English around 1530 and was borrowed from Middle French carotte, itself from Late Latin carōta, from Greek καρωτόν karōton, originally from the Indo-European root *ker- (horn), due to its horn-like shape). In Old English, carrots (typically white at the time) were not clearly distinguished from parsnips, the two being collectively called moru or more (from Proto-Indo-European *mork- "edible root", cf. German Möhre).
The wild ancestors of the carrot are likely to have come from Persia (regions of which are now Iran and Afghanistan), which remain the centre of diversity of Daucus carota, the wild carrot. A naturally occurring subspecies of the wild carrot, Daucus carota subsp. sativus, has been selectively bred over the centuries to reduce bitterness, increase sweetness and minimise the woody core. This has produced the familiar garden vegetable.
When they were first cultivated, carrots were grown for their aromatic leaves and seeds rather than their roots. Carrot seeds have been found in Switzerland and Southern Germany dating to 2000–3000 BC. Some close relatives of the carrot are still grown for their leaves and seeds, for example parsley, fennel, dill and cumin. The first mention of the root in classical sources is during the 1st century. The plant appears to have been introduced into Europe via Spain by the Moors in the 8th century. and in the 10th century, in such locations in West Asia, India and Europe, the roots were purple. The modern carrot originated in Afghanistan at about this time. The 12th-century Arab Andalusian agriculturist, Ibn al-'Awwam, describes both red and yellow carrots; The Jewish scholar Simeon Seth also mentions roots of these colours in the 11th century. Cultivated carrots appeared in China in the 14th century, and in Japan in the 18th century. Orange-coloured carrots appeared in the Netherlands, where the flag included orange, in the 17th century. 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." European settlers introduced the carrot to Colonial America in the 17th century.
Purple carrots, still orange on the inside, were sold in British stores starting in 2002.
Daucus carota is a biennial plant that grows a rosette of leaves in the spring and summer, while building up the stout taproot that stores large amounts of sugars for the plant to flower in the second year.
Soon after germination, carrot seedlings show a distinct demarcation between the taproot and the hypocotyl. The latter is thicker and lacks lateral roots. At the upper end of the hypocotyl is the seed leaf. The first true leaf appears about 10–15 days after germination. Subsequent leaves, produced from the stem nodes, are alternating (with a single leaf attached to a node, and the leaves growing in alternate directions) and compound, and arranged in a spiral. The leaf blades are pinnate. As the plant grows, the bases of the cotyledon are pushed apart. The stem, located just above the ground, is compressed and the internodes are not distinct. When the seed stalk elongates, the tip of the stem narrows and becomes pointed, extends upward, and becomes a highly branched inflorescence. The stems grow to 60–200 cm (20–80 in) tall.
Most of the taproot consists of parenchymatous outer cortex (phloem) and an inner core (xylem). High-quality carrots have a large proportion of cortex compared to core. Although a completely xylem-free carrot is not possible, some cultivars have small and deeply pigmented cores; the taproot can appear to lack a core when the colour of the cortex and core are similar in intensity. Taproots typically have a conical shape, although cylindrical and round cultivars are available. The root diameter can range from 1 cm (0.4 in) to as much as 10 cm (4 in) at the widest part. The root length ranges from 5 to 50 cm (2.0 to 19.7 in), although most are between 10 and 25 cm (4 and 10 in).
Flower development begins when the flat apical meristem changes from producing leaves to an uplifted conical meristem capable of producing stem elongation and an inflorescence. The inflorescence is a compound umbel, and each umbel contains several umbellets. The first (primary) umbel occurs at the end of the main floral stem; smaller secondary umbels grow from the main branch, and these further branch into third, fourth, and even later-flowering umbels. A large primary umbel can contain up to 50 umbellets, each of which may have as many as 50 flowers; subsequent umbels have fewer flowers. Flowers are small and white, sometimes with a light green or yellow tint. They consist of five petals, five stamens, and an entire calyx. The anthers usually dehisce and the stamens fall off before the stigma becomes receptive to receive pollen. The anthers of the brown male sterile flowers degenerate and shrivel before anthesis. In the other type of male sterile flower, the stamens are replaced by petals, and these petals do not fall off. A nectar-containing disc is present on the upper surface of the carpels.
Flower development is protandrous, so the anthers release their pollen before the stigma of the same flower is receptive. The arrangement is centripetal, meaning the oldest flowers are near the edge and the youngest flowers are in the center. Flowers usually first open at the periphery of the primary umbel, followed about a week later on the secondary umbels, and then in subsequent weeks in higher-order umbels. The usual flowering period of individual umbels is 7 to 10 days, so a plant can be in the process of flowering for 30–50 days. The distinctive umbels and floral nectaries attract pollinating insects. After fertilization and as seeds develop, the outer umbellets of an umbel bend inward causing the umbel shape to change from slightly convex or fairly flat to concave, and when cupped it resembles a bird's nest.
The fruit that develops is a schizocarp consisting of two mericarps; each mericarp is an achene or true seed. The paired mericarps are easily separated when they are dry. Premature separation (shattering) before harvest is undesirable because it can result in seed loss. Mature seeds are flattened on the commissural side that faced the septum of the ovary. The flattened side has five longitudinal ribs. The bristly hairs that protrude from some ribs are usually removed by abrasion during milling and cleaning. Seeds also contain oil ducts and canals. Seeds vary somewhat in size, ranging from less than 500 to more than 1000 seeds per gram.
The carrot is a diploid species, and has nine relatively short, uniform-length chromosomes (2n=9). The genome size is estimated to be 473 mega base pairs, which is four times larger than Arabidopsis thaliana, one-fifth the size of the maize genome, and about the same size as the rice genome.
Polyacetylenes can be found in Apiaceae vegetables like carrots where they show cytotoxic activities. Falcarinol and falcarindiol (cis-heptadeca-1,9-diene-4,6-diyne-3,8-diol) are such compounds. This latter compound shows antifungal activity towards Mycocentrospora acerina and Cladosporium cladosporioides. Falcarindiol is the main compound responsible for bitterness in carrots.
Other compounds such as pyrrolidine (present in the leaves), 6-hydroxymellein, 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.
|Nutritional value per 100 g (3.5 oz)|
|Energy||173 kJ (41 kcal)|
|Dietary fiber||2.8 g|
|Vitamin A equiv.|
|Percentages are roughly approximated using US recommendations for adults.|
Source: USDA Nutrient Database
The carrot gets its characteristic, bright orange colour from β-carotene, and lesser amounts of α-carotene, γ-carotene, lutein and zeaxanthin. α and β-carotenes are partly metabolized into vitamin A, providing more than 100% of the Daily Value (DV) per 100 g serving of carrots (right table). Carrots are also a good source of dietary fiber (11% DV), vitamin K (16% DV) and vitamin B6 (11% DV), but otherwise have modest content of other essential nutrients (right table).
Carrots are 88% water, 4.7% sugar, 2.6% protein, 1% ash, and 0.2% fat. Carrot dietary fiber comprises mostly cellulose, with smaller proportions of hemicellulose, lignin and starch. Free sugars in carrot include sucrose, glucose and fructose.
Methods of consumption and uses
Carrots can be eaten in a variety of ways. Only 3 percent of the β-carotene in raw carrots is released during digestion: this can be improved to 39% by pulping, cooking and adding cooking oil. 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. Together with onion and celery, carrots are one of the primary vegetables used in a mirepoix to make various broths.
The greens are edible as a leaf vegetable, but are only occasionally eaten by humans; some sources suggest that the greens contain toxic alkaloids. When used for this purpose, they are harvested young in high-density plantings, before significant root development, and typically used stir-fried, or in salads. Some people are allergic to carrots. In a 2010 study on the prevalence of food allergies in Europe, 3.6 percent of young adults showed some degree of sensitivity to carrots. Because the major carrot allergen, the protein Dauc c 1.0104, is cross-reactive with homologues in birch pollen (Bet v 1) and mugwort pollen (Art v 1), most carrot allergy sufferers are also allergic to pollen from these plants.
In India carrots are used in a variety of ways, as salads or as vegetables added to spicy rice or dal dishes. A popular variation in north India is the Gajar Ka Halwa 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 with a seasoning of mustard seeds and green chillies popped in hot oil. Carrots can also be cut in thin strips and added to rice, can form part of a dish of mixed roast vegetables or can be blended with tamarind to make chutney.
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. Carrots are puréed and used as baby food, dehydrated to make chips, flakes, and powder, and thinly sliced and deep-fried, like potato chips.
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 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.
Carrots are useful companion plants for gardeners. The pungent odour of onions, leeks and chives help repel the carrot root fly, and other vegetables that team well with carrots include lettuce, tomatoes and radishes, as well as the herbs rosemary and sage. Carrots thrive in the presence of caraway, coriander, chamomile, marigold and Swan River daisy. If left to flower, the carrot, like any umbellifer, attracts predatory wasps that kill many garden pests.
Carrots are grown from seed and take around four months to mature. They grow best in full sun but tolerate some shade. The optimum growth temperature is between 16 and 21 °C (61 and 70 °F). The ideal soil is deep, loose and well-drained, sandy or loamy and with a pH of 6.3 to 6.8. Fertiliser should be applied according to soil type and the crop requires low levels of nitrogen, moderate phosphate and high potash. Rich soils should be avoided, as these will cause the roots to become hairy and misshapen. Irrigation should be applied when needed to keep the soil moist and the crop should be thinned as necessary and kept weed free.
There are several diseases that can reduce the yield and market value of carrots. The most devastating carrot disease is Alternaria leaf blight, which has been known to eradicate entire crops. A bacterial leaf blight caused by Xanthomonas campestris can also be destructive in warm, humid areas. Root knot nematodes (Meloidogyne species) can cause stubby or forked roots, or galls. Cavity spot, caused by the oomycetes Pythium violae and Pythium sulcatum, results in irregularly shaped, depressed lesions on the taproots.
Physical damage can also reduce the value of carrot crops. The two main forms of damage are splitting, whereby a longitudinal crack develops during growth that can be a few centimetres to the entire length of the root, and breaking, which occurs postharvest. These disorders can affect over 30% of commercial crops. Factors associated with high levels of splitting include wide plant spacing, early sowing, lengthy growth durations, and genotype.
"Eastern" (a European and American continent reference) carrots were domesticated in Persia (probably in the lands of modern-day Iran and Afghanistan within West Asia) during 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.
The western carrot emerged in the Netherlands in the 17th century, There is a popular belief that its orange colour making it popular in those countries as an emblem of the House of Orange and the struggle for Dutch independence, although there is little evidence for this. The orange colour results from abundant carotenes in these cultivars.
Western carrot cultivars are commonly classified by their root shape. The four general types are:
- Chantenay carrots. Although the roots are shorter than other cultivars, they have vigorous foliage and greater girth, being broad in the shoulders and tapering towards a blunt, rounded tip. They store well, have a pale-coloured core and are mostly used for processing. Varieties include Carson Hybrid and Red Cored Chantenay.
- Danvers carrots. These have strong foliage and the roots are longer than Chantaney types, and they have a conical shape with a well-defined shoulder, tapering to a point. They are somewhat shorter than Imperator cultivars, but more tolerant of heavy soil conditions. Danvers cultivars store well and are used both fresh and for processing. They were developed in 1871 in Danvers, Massachusetts. Varieties include Danvers Half Long and Danvers 126.
- Imperator carrots. This cultivar has vigorous foliage, is of high sugar content, and has long and slender roots, tapering to a pointed tip. Imperator types are the most widely cultivated by commercial growers. Varieties include Imperator 58 and Sugarsnax Hybrid.
- Nantes carrots. These have sparse foliage, are cylindrical, short with a more blunt tip than Imperator types, and attain high yields in a range of conditions. The skin is easily damaged and the core is deeply pigmented. They are brittle, high in sugar and store less well than other types. Varieties include Nelson Hybrid, Scarlet Nantes and Sweetness Hybrid.
One particular variety lacks the usual orange pigment due to carotene, and owing its white colour to a recessive gene for tocopherol (vitamin E). Derived from Daucus carota L. and patented at the University of Wisconsin–Madison, the variety is intended to supplement the dietary intake of Vitamin E.
Carrots can be selectively bred to produce different colours.
Carrot is one of the ten most economically important vegetables crops in the world. In 2012, according to the Food and Agriculture Organization of the United Nations, 36.917 million tonnes of carrots and turnips were produced worldwide for human consumption, grown on 1,196,000 hectares (2,955,000 acres) of land. With a total production of 16.907 million tonnes, China was by far the largest producer and accounted for 45.8% of the global output, followed by Russia (1.57 million tonnes), the United States (1.346), Uzbekistan (1.300), Ukraine (0.916), Poland (0.835), and the United Kingdom (0.664). About 62% of world carrot production occurred in Asia, followed by Europe (22.6%) and the Americas (North, Central, and South America and the Caribbean) (9.4%). Less than 6% of the world's 2012 total production was grown in Africa. Global production has increased from 21.4 million tonnes in 2000, 13.7 million tonnes in 1990, 10.4 million tonnes in 1980, and 7.85 million tonnes in 1970. The rate of increase in the global production of carrots has been greater than the world's population growth rate, and greater than the overall increase in world vegetable production. Europe was traditionally the major centre of production, but was overtaken by Asia in 1997. The growth in global production is largely the result of increases in production area rather than improvements in yield. Modest increases in the latter can be attributed to optimised agricultural practices, the development of better cultivars (including hybrids), and increased farm mechanisation.
Carrots can be stored for several months in the refrigerator or over winter in a moist, cool place. For long term storage, unwashed carrots can be placed in a bucket between layers of sand, a 50/50 mix of sand and wood shavings, or in soil. A temperature range of 32 to 40 °F (0 to 5 °C) is best.
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