name = Rapeseed
image_caption = Rapeseed ("Brassica napus")
genus = "
species = "B. napus"
binomial = "Brassica napus"
binomial_authority = L. [cite web
title=Brassica napus information from NPGS/GRIN
Rapeseed ("Brassica napus"), also known as rape, oilseed rape, rapa, rapaseed and (in the case of one particular group of
cultivars) canola, is a bright yellow flowering member of the family Brassicaceae(mustard or cabbage family). The name derives from the Latinfor turnip, "rāpum" or "rāpa", and is first recorded in English at the end of the 14th century. Older writers usually distinguished the turnip and rape by the adjectives "round" and "long"(-"rooted") respectively. [ [http://dictionary.oed.com/ OED Online] ] See also " Brassica napobrassica", which may be considered a variety of "Brassica napus". Some botanists include the closely related "Brassica campestris" within "B. napus". (See Triangle of U)
Cultivation and uses
Rapeseed is grown for the production of
animal feed, vegetable oilfor human consumption, and biodiesel; leading producers include the European Union, Canada, the United States, Australia, Chinaand India. In India, it is grown on 13% of cropped land. According to the United States Department of Agriculture, rapeseed was the third leading source of vegetable oilin the world in 2000, after soybeanand oil palm, and also the world's second leading source of proteinmeal, although only one-fifth of the production of the leading soybean meal. World production is growing rapidly, with FAO reporting that 36 million tonnes of rapeseed was produced in the 2003-4 season, and 46 million tonnes in 2004-5. In Europe, rapeseed is primarily cultivated for animal feedFact|date=February 2007 (owing to its very high lipidand medium protein contentFact|date=February 2007), and is a leading option for Europeans to avoid importation of GMOproductsFact|date=February 2007. Natural rapeseed oil contains 50% erucic acid, which is mildly toxic to humansFact|date=July 2008 in large doses but is used as a food additive in smaller doses. Wild type seeds also contain high levels of glucosinolates(mustard oil glucosindes), chemical compounds that significantly lowered the nutritional value of rape seed press cakes for animal feed. Canola, originally a syncopated form of the abbreviation "Can.O., L-A." (Canadian Oilseed, Low-Acid) that was used by the Manitoba government to label the seed during its experimental stages, is now a tradename for 'double low' (low erucic acid and low glucosinolate rapeseed. Sometimes the "Canola-quality" sticky note is applied to other varieties as well [Canola-quality Brassica juncea, a new oilseed crop for the Canadian prairies .DA Potts, GW Rakow, DR Males - New Horizons for an old crop. Proc 10th Intl Rapeseed Congr, Canberra, Australia, 1999] .
The rapeseed is the valuable, harvested component of the crop. The crop is also grown as a
winter- cover crop. It provides good coverage of the soilin winter, and limits nitrogenrun-off. The plant is ploughed back in the soil or used as bedding. On some ecologicalor organic operations, livestock such as sheepor cattleare allowed to graze on the plants.
Processing of rapeseed for oil production provides rapeseed animal meal as a by-product. The by-product is a high-protein animal feed, competitive with soyaFact|date=February 2007. The feed is mostly employed for
cattlefeeding, but also for pigs and chickens (though less valuable for these). The meal has a very low content of the glucosinolates responsible for metabolism disruption in cattle and pigsFact|date=February 2007. Rapeseed "oil cake" is also used as a fertilizer in China, and may be used for ornamentals, such as Bonsai, as well.
Rapeseed leaves and stems are also edible, similar to those of the related
bok choyor kale. Some varieties of rapeseed (called , yóu cài, lit. "oil vegetable" in Chinese; "yau choy" in Cantonese; "cải dầu" in Vietnamese; and 菜の花, "nanohana" in Japanese) are sold as greens, primarily in Asian groceries, including those in California where it is known as "yao choy" or tender greens.
Rapeseed is a heavy
nectarproducer, and honeybees produce a light colored, but peppery honeyfrom it. It must be extracted immediately after processing is finished, as it will quickly granulate in the honeycomband will be impossible to extract. The honey is usually blended with milder honeys, if used for table use, or sold as bakerygrade. Rapeseed growers contractwith beekeepers for the pollination of the crop.
Canola oil (or rapeseed oil) contains both
omega-6and omega-3fatty acids in a ratio of 2:1 and is second only to flax oil in omega-3 fatty acid. Canola oil's proponents claim that it is one of the most heart-healthy oils and has been reported to reduce cholesterollevels, lower serum tryglyceridelevels, and keep platelets from sticking together.
Other sources (such as The Weston Price Foundation [http://www.westonaprice.org/knowyourfats/conola.html] ) have well researched concerns about the possible health risks of Canola oil: animal testing that indicates growth retardation, a higher incidence of heart lesions of the
myocardium, decrease in platelet countand increase in platelet size, vitamin E deficiency, high blood pressure, and lowered life spans. In many of these studies, when saturated fats were added to the diets, health improved. There is also the concern that the modern process of extracting the oils with high-pressure mechanical pressing along with industrial solventresidue in the oil such as Hexanein itself can be toxic. These heat, high pressure and solvent processing methods [http://www.westonaprice.org/knowyourfats/conola.html] are common with most contemporary vegetable oils. Since omega-3 fatty acids rapidly become offensive smelling and subject to rancidificationwhen processed with high heat and oxygen, the oil is then subjected to a deodorizing process which removes much of the Omega-3 and replaces it with trans fats. The actual claims of the Omega 3 content of processed canola oil have been challenged by a study [http://www.westonaprice.org/knowyourfats/conola.html] done at the University of Floridawhich found trans fat levels of up to 4.6 in commercial canola oilas opposed to the Canadian Governments assertion that the oil has 0.2 percent trans fat. Because of concerns about inhibited growth in human infants, canola oil is not permitted in infant formulaby the FDA.
Some UK farmers (such as Hillfarm Oils [http://www.hillfarmoils.com] ) & Farrington Oils [http://www.farrington-oils.co.uk] ) have started to produce cold-pressed rapeseed oil as a cooking oil and dressing.
Rapeseed oil is used in the manufacture of
biodieselfor powering motor vehicles. Biodiesel may be used in pure form in newer engines without engine damage, and is frequently combined with fossil-fuel dieselin ratios varying from 2% to 20% biodiesel. Formerly, owing to the costs of growing, crushing, and refining rapeseed biodiesel, rapeseed derived biodiesel cost more to produce than standard diesel fuel. Prices of rapeseed oil are at very high levels presently (start November 05) owing to increased demand on rapeseed oil for this purpose. Rapeseed oil is the preferred oil stock for biodiesel production in most of Europe, partly because rapeseed produces more oil per unit of land area compared to other oil sources, such as soy beans.
Rapeseed has been linked with adverse effects in
asthmaand hay feversufferers. Some suggest that oilseed pollenincreases breathing difficulties. But this is unlikely as rapeseed is an entomophilouscrop, with pollen transfer primarily by insects. Others suggest that this is caused by the inhalation of oilseed rape dust [Oilseed rape allergy presented as occupational asthmain the grain industry. http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=PubMed&list_uids=9761021&dopt=Abstract] , and that allergies to the pollen are relatively rare. It may also be that since rapeseed in flower has a distinctive and pungent smell, hay fever sufferers wrongly blame the rapeseed just because they can smell it. An alternative explanation may be that it is simply the sheer volume of rapeseed pollen in the air around farmland which triggers an allergic reaction in hayfever sufferers on inhalation, or following prolonged exposure to high levels.
The Monsanto Company has genetically engineered new cultivars of rapeseed that are resistant to the effects of its
herbicide Roundup. They have been vigorously prosecuting farmers found to have the "Roundup Ready" genein Canola in their fields without paying a license fee. These farmers have claimed the "Roundup Ready" gene was blown into their fields and crossed with unaltered Canola. Other farmers claim that after spraying Roundup in non-Canola fields to kill weeds before planting, "Roundup Ready" volunteers are left behind, causing extra expense to rid their fields of the weeds.
In a closely followed legal battle, the
Supreme Court of Canadafound in favor of Monsanto's patent infringement claim for illegal growing of "Roundup Ready" in its 2004 ruling on Monsanto Canada Inc. v. Schmeiser. The case garnered international controversy as a court-sanctioned legitimation for the global patent protection of genetically modified crops. However, Schmeiser was not required to pay damages as he did not benefit financially from the GMO crop in his field. More recently, in March 2008, an out-of-court settlement between Monsanto and Schmeiser has an agreement for Monsanto to clean up the entire GMO- canolacrop on Schmeiser's farm at a cost of $660,000.
Worldwide production of rapeseed (including canola) rose to 46.4 million metric tons in 2005, the highest recorded total (source:
Pests and diseases
* Harlequin bug ("Murgantia histrionica")
Flea beetles ("Phyllotreta" sp.),
Diamondback moths ("Plutella xylostella"),
Bertha armyworms ("Mamestra configurata"),
Root maggots ("Delia" sp.)
Lygus bugs ("Lygus")
Bronzed field beetlelarvae
Snails and slugs
Beet Western Yellows virus
Blackleg, caused by the fungus "Leptosphaeria maculans"
Clubroot, caused by protist"Plasmodiophora brassicae"
Sclerotinia white stem rot
White rust disease, caused by the fungus "Albugo candida"
Genome sequencing and genetics
The 'A' genome component of the amphidiploid Rapeseed species "B. napus" is currently being sequenced by an international consortium. [cite web
title=The www.brassica.info website for the Multinational Brassica Genome Project
Triangle of U
* [http://database.prota.org/dbtw-wpd/exec/dbtwpub.dll?AC=QBE_QUERY&BU=http%3A%2F%2Fdatabase.prota.org%2Fsearch.htm&TN=PROTAB~1&QB0=AND&QF0=Species+Code&QI0=Brassica+napus&RF=Webdisplay PROTAbase on "Brassica napus"]
* [http://www.canola-council.org/cooking_myths.html Canola Council on truth and myths about Canola]
* [http://www.snopes2.com/toxins/canola.htm Origins of "Canola oil is toxic" falsehood.]
* [http://www.wsu.edu/~gmhyde/433_web_pages/433Oil-web-pages/Rapeseed1/Rape&Canola_oils_1.html Extracting and refining rapeseed oil]
* Organisation for Economic Co-operation and Development (05-Dec-2001). [http://www.olis.oecd.org/olis/2001doc.nsf/43bb6130e5e86e5fc12569fa005d004c/19f31700dc91b614c1256b19003bd79d/$FILE/JT00118009.PDF CONSENSUS DOCUMENT ON KEY NUTRIENTS AND KEY TOXICANTS IN LOW ERUCIC ACID RAPESEED (CANOLA)] . ENV/JM/MONO(2001)13. Retrieved 2006-11-27
* University of Melbourne (1999) Multilingual multiscript plant name database. [http://www.plantnames.unimelb.edu.au/Sorting/Brassica.html Brassica names] . General Botanical Index. Retrieved 2006-11-27
* [http://www.gmo-safety.eu/en/oilseed_rape/ Safety research: GM oilseed rape] Oilseed rape in the environment and in agriculture
* [http://www.canolainfo.org CanolaInfo]
* [http://www.bbc.co.uk/radio4/factual/foodprogramme_20070204.shtml BBC Radio 4 Food Programme on rapeseed oil]
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Look at other dictionaries:
rapeseed — [rāp′sēd΄] n. the seed of the rape plant … English World dictionary
rapeseed — rape·seed rāp .sēd n the seed of the rape plant (Brassica napus of the mustard family) that is the source of rapeseed oil … Medical dictionary
rapeseed — noun Rapeseed is used before these nouns: ↑oil … Collocations dictionary
rapeseed — rapsai statusas Aprobuotas sritis pašarai apibrėžtis Rapsų (Brassica napus), himalajinių bastučių (Brassica rapa subsp. trilocularis) ir rapsukų (Brassica rapa subsp. oleifera) sėklos. Mažiausiasis grynis – 94 proc. atitikmenys: angl. rape seed;… … Lithuanian dictionary (lietuvių žodynas)
rapeseed — noun seed of rape plants; source of an edible oil • Hypernyms: ↑oilseed, ↑oil rich seed • Substance Holonyms: ↑rape, ↑colza, ↑Brassica napus • Substance Meronyms: ↑rape oil, ↑ … Useful english dictionary
rapeseed — noun Date: 15th century the seed of the rape plant; also rape I … New Collegiate Dictionary
rapeseed — /rayp seed /, n. 1. the seed of the rape. 2. the plant itself. [1525 35; RAPE2 + SEED] * * * … Universalium
rapeseed — noun a) The rape plant, Brassica napus, which produces a grain that is used widely for animal feed and vegetable oil. b) The seed of such plant … Wiktionary
rapeseed — Inglish (Indian English) Dictionary Canola see for oil; actually canola is a North American invention (Canadian oil, low acid) … English dialects glossary
rapeseed — n. seed of the rape plant … English contemporary dictionary