Brassica (//) is a genus of plants in the mustard family, the (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.
The genus Brassica is known for its important agricultural and horticultural crops and includes a number of weeds, both of wild taxa and escapees from cultivation. Brassica species and varieties commonly used for food include broccoli, cauliflower, cabbage, choy sum, rutabaga, turnip and some seeds used in the production of canola oil and the condiment mustard. Over 30 wild species and hybrids are in cultivation, plus numerous cultivars and hybrids of cultivated origin. Most are seasonal plants (annuals or biennials), but some are small shrubs. Brassica plants have been the subject of much scientific interest for their agricultural importance. Six particular species (B. carinata, B. juncea, B. oleracea, B. napus, B. nigra and B. rapa) evolved by the combining of chromosomes from three earlier species, as described by the Triangle of U theory.
A dislike for cabbage or broccoli can result from the fact that these plants contain a compound similar to phenylthiocarbamide (PTC), which is bitter or tasteless to some people, depending on their taste buds.
Almost all parts of some species or other have been developed for food, including the root (rutabaga, turnip), stems (kohlrabi), leaves (cabbage, collard greens, kale), flowers (cauliflower, broccoli), buds (Brussels sprouts, cabbage), and seeds (many, including mustard seed, and oil-producing rapeseed). Some forms with white or purple foliage or flowerheads are also sometimes grown for ornament.
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Brassica vegetables are highly regarded for their nutritional value. They provide high amounts of vitamin C and soluble fiber and contain nutrients with anticancer properties: 3,3'-diindolylmethane, sulforaphane and selenium. Boiling reduces the level of anticancer compounds, but steaming, microwaving, and stir frying do not result in significant loss. Steaming these vegetable for three to four minutes is recommended to maximize sulforaphane.
Brassica vegetables are rich in indole-3-carbinol, a chemical which boosts DNA repair in cells in vitro and appears to block the growth of cancer cells in vitro. They are also a good source of carotenoids, with broccoli having especially high levels. Researchers at the University of California at Berkeley have recently discovered that 3,3'-diindolylmethane in Brassica vegetables is a potent modulator of the innate immune response system with potent antiviral, antibacterial and anticancer activity. However, it also is an antiandrogen but is known to be antiandrogenic only in hormone-sensitive prostate cancer cells.
There is some disagreement among botanists on the classification and status of Brassica species and subspecies. The following is an abbreviated list, with an emphasis on economically important species.
- B. balearica: Mallorca cabbage
- B. carinata: Abyssinian mustard or Abyssinian cabbage, used to produce biodiesel
- B. elongata: elongated mustard
- B. fruticulosa: Mediterranean cabbage
- B. hilarionis: St Hilarion cabbage
- B. juncea: Indian mustard, brown and leaf mustards, Sarepta mustard
- B. napus: rapeseed, canola, rutabaga (swede, swede turnip, Swedish turnip)
- B. narinosa: broadbeaked mustard
- B. nigra: black mustard
- B. oleracea: kale, cabbage, collard greens, broccoli, cauliflower, kai-lan, Brussels sprouts, kohlrabi
- B. perviridis: tender green, mustard spinach
- B. rapa (syn. B. campestris): Chinese cabbage, turnip, rapini, komatsuna
- B. rupestris: brown mustard
- B. septiceps: seventop turnip
- B. tournefortii: Asian mustard
Species formerly placed in Brassica
- B. alba or B. hirta (white or yellow mustard)—see Sinapis alba
- B. geniculata (hoary mustard)—see Hirschfeldia incana
- B. kaber (wild mustard or charlock)—see Sinapis arvensis
Genome sequencing and genetics
Bayer CropScience (in collaboration with BGI-Shenzhen, China; Keygene N.V.; the Netherlands and the University of Queensland, Australia) announced it had sequenced the entire genome of rapeseed (canola, Brassica napus) and its constituent genomes present in B. rapa and B. oleracea in 2009. The B. rapa genome was sequenced by the Multinational Brassica Genome Project in 2011. This also represents the A genome component of the amphidiploid crop species B. napus and B. juncea.
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- Song, Lijiang; Thornalley, Paul J. (2007). "Effect of storage, processing and cooking on glucosinolate content of Brassica vegetables". Food and Chemical Toxicology. 45 (2): 216–24. doi:10.1016/j.fct.2006.07.021. PMID 17011103. Lay summary – University of Warwick (15 May 2007).
- Matusheski, Nathan V.; Swarup, Ranjan; Juvik, John A.; Mithen, Richard; Bennett, Malcolm; Jeffery, Elizabeth H. (2006). "Epithiospecifier Protein from Broccoli (Brassica oleraceaL. Ssp.italica) Inhibits Formation of the Anticancer Agent Sulforaphane". Journal of Agricultural and Food Chemistry. 54 (6): 2069–76. doi:10.1021/jf0525277. PMID 16536577. Lay summary – ScienceDaily (5 April 2005).
- Fan, S; Meng, Q; Auborn, K; Carter, T; Rosen, E M (2006). "BRCA1 and BRCA2 as molecular targets for phytochemicals indole-3-carbinol and genistein in breast and prostate cancer cells". British Journal of Cancer. 94 (3): 407–26. doi:10.1038/sj.bjc.6602935. PMC . PMID 16434996. Lay summary – BBC News (7 February 2006).
- Wu, Yongsheng; Feng, Xiaoling; Jin, Yucui; Wu, Zhaojia; Hankey, William; Paisie, Carolyn; Li, Lei; Liu, Fengjuan; et al. (2010). "A Novel Mechanism of Indole-3-Carbinol Effects on Breast Carcinogenesis Involves Induction of Cdc25A Degradation". Cancer Prevention Research. 3 (7): 818–28. doi:10.1158/1940-6207.CAPR-09-0213. PMID 20587702. Lay summary – ScienceDaily (30 June 2010).
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- Vivar, Omar I.; Lin, Chia-Lei; Firestone, Gary L.; Bjeldanes, Leonard F. (2009). "3,3′-Diindolylmethane induces a G1 arrest in human prostate cancer cells irrespective of androgen receptor and p53 status". Biochemical Pharmacology. 78 (5): 469–76. doi:10.1016/j.bcp.2009.05.008. PMC . PMID 19433067.
- Le, Hien T.; Schaldach, Charlene M.; Firestone, Gary L.; Bjeldanes, Leonard F. (2003). "Plant-derived 3,3′-Diindolylmethane Is a Strong Androgen Antagonist in Human Prostate Cancer Cells". Journal of Biological Chemistry. 278 (23): 21136–45. doi:10.1074/jbc.M300588200. PMID 12665522.
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- "Bayer CropScience first to sequence the entire genome of rapeseed/canola" (Press release). Bayer CropScience. 9 October 2009. Retrieved 25 May 2013.
- Wang, Xiaowu; Wang, Hanzhong; Wang, Jun; Sun, Rifei; Wu, Jian; Liu, Shengyi; Bai, Yinqi; Mun, Jeong-Hwan; et al. (2011). "The genome of the mesopolyploid crop species Brassica rapa". Nature Genetics. 43 (10): 1035–9. doi:10.1038/ng.919. PMID 21873998.
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