Brassica rapa | |
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Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Rosids |
Order: | Brassicales |
Family: | Brassicaceae |
Genus: | Brassica |
Species: | B. rapa |
Binomial name | |
Brassica rapa | |
Brassica rapa is a plant species growing in various widely cultivated forms including the turnip (a root vegetable); Komatsuna , napa cabbage , bomdong , bok choy , and rapini .
Brassica rapa subsp. oleifera is an oilseed which has many common names, including rape, field mustard, bird's rape, and keblock. [2] [3] [4] [5] [6] [7] The term rapeseed oil is a general term for oil from Brassica species. Food grade oil made from the seed of low-erucic acid Canadian-developed strains is also called canola oil, while non-food oil is called colza oil. [2] Canola oil is sourced from three species of Brassica plants: Brassica rapa and Brassica napus are commonly grown in Canada, while Brassica juncea (brown mustard) is a minor crop for oil production. [8]
The origin of B. rapa, both geographically and any surviving wild relatives, has been difficult to identify because it has been developed by humans into many types of vegetables, is now found in most parts of the world, and has returned to the wild many times as a feral plant. A study of genetic sequences from over 400 domesticated and feral B. rapa individuals, along with environmental modelling, has provided more information about the complex history. These indicate that the ancestral B. rapa probably originated 4000 to 6000 years ago in the Hindu Kush area of Central Asia, and had three sets of chromosomes. This provided the genetic potential for a diversity of form, flavour and growth requirements. Domestication has produced modern vegetables and oil-seed crops, all with two sets of chromosomes. [9] [10]
Oilseed subspecies (oleifera) of Brassica rapa may have been domesticated several times from the Mediterranean to India, starting as early as 2000 BC. [11] Edible turnips were possibly first cultivated in northern Europe, and were an important food in ancient Rome. [11] The turnip then spread east to China, and reached Japan by 700 AD. [11] There are descriptions of B. rapa vegetables in Indian and Chinese documents from around 1000 BC. [9]
In the 18th century, the turnip and the oilseed-producing variants were seen as being different species by Carl Linnaeus who named them B. rapa and B. campestris. Twentieth-century taxonomists found that the plants were cross fertile and thus belonged to the same species. Since the turnip had been named first by Linnaeus, the name Brassica rapa was adopted. [12]
Many butterflies, including the small white, feed from and pollinate the B. rapa flowers.
The young leaves are considered an excellent leaf vegetable and can be eaten raw; older leaves are better cooked. The taproot and seeds can also be eaten raw, although the latter contains an oil which may cause irritation for some people. [13]
Cultivar | Image | Name |
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Bok choy | Brassica rapa subsp. chinensis | |
Bomdong | Brassica rapa var. glabra | |
Choy sum | Brassica rapa subsp. parachinensis | |
Field mustard | Brassica rapa subsp. oleifera | |
Komatsuna | Brassica rapa subsp. perviridis | |
Mizuna | Brassica rapa var. nipposinica | |
Napa cabbage | Brassica rapa subsp. pekinensis | |
Rapini | Brassica rapa var. ruvo | |
Tatsoi | Brassica rapa subsp. narinosa | |
Turnip | Brassica rapa subsp. rapa | |
Yellow sarson | Brassica rapa subsp. trilocularis | |
The turnip or white turnip is a root vegetable commonly grown in temperate climates worldwide for its white, fleshy taproot. The word turnip is a compound of turn as in turned/rounded on a lathe and neep, derived from Latin napus, the word for the plant. Small, tender varieties are grown for human consumption, while larger varieties are grown as feed for livestock. In Northern England, Scotland, Ireland, Cornwall, Devon, and parts of Canada, the word turnip often refers to rutabaga, also known as swede, a larger, yellow root vegetable in the same genus (Brassica).
Brassica is a genus of plants in the cabbage and mustard family (Brassicaceae). The members of the genus are informally known as cruciferous vegetables, cabbages, or mustard plants. Crops from this genus are sometimes called cole crops—derived from the Latin caulis, denoting the stem or stalk of a plant.
Rutabaga or swede is a root vegetable, a form of Brassica napus. Other names include Swedish turnip, neep (Scots), and turnip. However, elsewhere the name "turnip" usually refers to the related white turnip. The species Brassica napus originated as a hybrid between the cabbage and the turnip. Rutabaga roots are eaten as human food in various ways, and the leaves can be eaten as a leaf vegetable. The roots and tops are also used for livestock, either fed directly in the winter or foraged in the field during the other seasons. Scotland, Northern and Western England, Wales, the Isle of Man and Ireland had a tradition of carving the roots into lanterns at Halloween.
Beta vulgaris (beet) is a species of flowering plant in the subfamily Betoideae of the family Amaranthaceae. Economically, it is the most important crop of the large order Caryophyllales. It has several cultivar groups: the sugar beet, of greatest importance to produce table sugar; the root vegetable known as the beetroot or garden beet; the leaf vegetable known as chard or spinach beet or silverbeet; and mangelwurzel, which is a fodder crop. Three subspecies are typically recognised. All cultivars fall into the subspecies Beta vulgaris subsp. vulgaris. The wild ancestor of the cultivated beets is the sea beet.
Rapeseed, also known as rape, or oilseed rape, is a bright-yellow flowering member of the family Brassicaceae, cultivated mainly for its oil-rich seed, which naturally contains appreciable amounts of erucic acid. The term "canola" denotes a group of rapeseed cultivars that were bred to have very low levels of erucic acid and which are especially prized for use as human and animal food. Rapeseed is the third-largest source of vegetable oil and the second-largest source of protein meal in the world.
Chinese cabbage can refer to two cultivar groups of leaf vegetables often used in Chinese cuisine: the Pekinensis Group and the Chinensis Group.
Rapini or broccoli rabe is a green cruciferous vegetable, with the leaves, buds, and stems all being edible; the buds somewhat resemble broccoli, but do not form a large head. Rapini is known for its bitter taste, and is particularly associated with Mediterranean cuisine.
Bok choy, pak choi or pok choi is a type of Chinese cabbage, used as food. Chinensis varieties do not form heads and have green leaf blades with lighter bulbous bottoms instead, forming a cluster reminiscent of mustard greens. It has a flavor between spinach and water chestnuts but is slightly sweeter, with a mildly peppery undertone. The green leaves have a stronger flavor than the white bulb.
Leaf vegetables, also called leafy greens, pot herbs, vegetable greens, or simply greens, are plant leaves eaten as a vegetable, sometimes accompanied by tender petioles and shoots. Leaf vegetables eaten raw in a salad can be called salad greens.
Brassica nigra, or black mustard, is an annual plant cultivated for its dark-brown-to-black seeds, which are commonly used as a spice. It is native to tropical regions of North Africa, temperate regions of Europe, and parts of Asia.
The mustard plant is any one of several plant species in the genera Brassica and Sinapis in the family Brassicaceae. Mustard seed is used as a spice. Grinding and mixing the seeds with water, vinegar, or other liquids creates the yellow condiment known as prepared mustard. The seeds can also be pressed to make mustard oil, and the edible leaves can be eaten as mustard greens. Many vegetables are cultivated varieties of mustard plants; domestication may have begun 6,000 years ago.
Brassica juncea, commonly brown mustard, Chinese mustard, Indian mustard, leaf mustard, Oriental mustard and vegetable mustard, is a species of mustard plant.
Lepidium campestre, the field pepperwort or field pepperweed or field cress, is usually a biennial with some form of annual plant in the Brassicaceae or mustard family, native to Europe, but commonly found in North America as an invasive weed. The most notable characteristic of field pepperweed is the raceme of flowers which forks off of the stem. These racemes are made up of first small white flowers and later green, flat and oval seedpods each about 6 mm long and 4 mm wide. Each seedpod contains two brown, 2.5 mm long seeds.
Leptosphaeria maculans is a fungal pathogen of the phylum Ascomycota that is the causal agent of blackleg disease on Brassica crops. Its genome has been sequenced, and L. maculans is a well-studied model phytopathogenic fungus. Symptoms of blackleg generally include basal stem cankers, small grey lesions on leaves, and root rot. The major yield loss is due to stem canker. The fungus is dispersed by the wind as ascospores or rain splash in the case of the conidia. L. maculans grows best in wet conditions and a temperature range of 5–20 degrees Celsius. Rotation of crops, removal of stubble, application of fungicide, and crop resistance are all used to manage blackleg. The fungus is an important pathogen of Brassica napus (canola) crops.
Napa cabbage is a type of Chinese cabbage originating near the Beijing region of China that is widely used in East Asian cuisine. Since the 20th century, it has also become a widespread crop in Europe, the Americas and Australia. In much of the world, it is referred to as "Chinese cabbage". In Australia it also is referred to as "wombok".
Brassica carinata is a species of flowering plant in the Brassicaceae family. It is referred to by the common names Ethiopian rape or Ethiopian mustard. It is believed to be a hybrid between Brassica nigra and Brassica oleracea.
A crop wild relative (CWR) is a wild plant closely related to a domesticated plant. It may be a wild ancestor of the domesticated (cultivated) plant or another closely related taxon.
Psylliodes chrysocephala or Psylliodes chrysocephalus, commonly known as the cabbage-stem flea beetle, is a species of leaf beetle situated in the subfamily Galerucinae and the tribe Alticini.
Isobel Parkin Ph.D. is a Canadian research scientist with Agriculture and Agri-Food Canada. She is one of the world's premier canola scientists and her area of expertise focuses on brassica genomics, comparative genome organization, global gene expression analysis, and abiotic stress responses. She is well known for her work on an international project on the genetics of oil seeds, in particular the mapping and sequencing of the canola oil genome. She Co-lead the Canadian Canola Genome Sequence (CanSeq) team that successfully deciphered the canola genome and developed a high-quality genome sequence.
Rapeseed oil is one of the oldest known vegetable oils. There are both edible and industrial forms produced from rapeseed, the seed of several cultivars of the plant family Brassicaceae. Historically, it was restricted as a food oil due to its content of erucic acid, which in laboratory studies was shown to be damaging to the cardiac muscle of laboratory animals in high quantities and which imparts a bitter taste, and glucosinolates, which made it less nutritious in animal feed. Rapeseed oil from standard cultivars can contain up to 54% erucic acid.