出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2013/05/12 00:33:45」(JST)
アブラナ | ||||||||||||||||||||||||
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菜の花
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分類 | ||||||||||||||||||||||||
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学名 | ||||||||||||||||||||||||
Brassica rapa L. var. nippo-oleifera | ||||||||||||||||||||||||
和名 | ||||||||||||||||||||||||
油菜、菜の花、菜種、赤種 | ||||||||||||||||||||||||
英名 | ||||||||||||||||||||||||
Rapeseed,Chinese colza |
アブラナ(油菜)は、アブラナ科アブラナ属の二年生植物。古くから野菜として、また油を採るため栽培されてきた作物で、別名としてナノハナ(菜の花)、ナタネ(菜種は正式な作物名である)などがあり、江戸時代には胡菜または菜薹と呼ばれた。
実際にはアブラナ属の花はどれも黄色で似通っていることから、すべて「菜の花」と呼ばれる傾向がある。
植物油の原料として栽培されているのは、ほとんどが別種のセイヨウアブラナ(西洋油菜、学名:B. napus)であり、在来種のアブラナは野菜として生産され、開花前に収穫されてしまう事が多い。
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原種は、西アジアから北ヨーロッパの大麦畑に生えていた雑草で、農耕文化と共に移動したと考えられている。漢代の中国に渡ると栽培作物となり多様な野菜を生むなど、東アジアで古くから栽培されている。日本では弥生時代以降から利用されたとみられる。
本来は菜、つまり葉物野菜として利用され、古事記では吉備の菘菜(あおな)、万葉集では佐野の茎立(くくたち)として登場し、花芽についても、延喜式に記されている。
江戸時代になって、植物油の採油目的として栽培され、その油は菜種油と呼ばれた。菜種油は、主に灯油原料として利用され、生活に密着したものとなった。そのため、菜種という言葉は、一般的な植物(作物)名として定着したのであった。また、一般にアブラナ属植物の種子からは油が採取でき、カラシナやカブも利用されている。
丈夫で育てやすく、広く栽培されたなじみ深い作物だった。また、菜種畑は明るい黄色が畑を覆う「菜の花畑」として春の風物詩とされ、歌や文学作品の題材となるが、明治時代以降はセイヨウアブラナに置き換わっている。
原種であるBrassica rapaの変種は数多く[1]、野菜として利用されているものが多い。
このほかコウサイタイ、ブロッコレットなどが、市場に出回るようになっている。アスパラ菜など、交配による新顔も登場している。
アブラナ科植物は形態的な変異に富んでいるが、その見た目とは反対に交雑して雑種が生まれ易い。すなわち、同種だけでなく他種の花粉によって結実してしまうもので、学術的な分類の困難な品種も多い。
これは、固定種や在来品種を維持するために自家採種を行っている農家にとって、特に頭の痛い問題であり、種苗用の種子生産では交雑を避けるために隔離栽培(他のアブラナ科植物の花粉で汚染されないよう、数百メートル以上離す)が必要だが、一般の圃場では不可能に近い(小さな島などで例がある)
この項では、セイヨウアブラナも含めたアブラナとしての用途を記す。
国内の栽培面積では、北海道が最大で、特に滝川市が多い。また、青森県横浜町、次いで、秋田県の作付けが大きい。千葉県の房総半島南部(館山市、南房総市、鴨川市など)の栽培は、統計上大きくはないが、県の花になっている。
Country | 1965 | 1975 | 1985 | 1995 | 2000 | 2005 | 2007 | 2009 |
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中国 | 1.1 | 1.5 | 5.6 | 9.8 | 11.3 | 13.0 | 10.5 | 13.5 |
カナダ | 0.5 | 1.8 | 3.5 | 6.4 | 7.2 | 9.4 | 9.6 | 11.8 |
インド | 1.5 | 2.3 | 3.1 | 5.8 | 5.8 | 7.6 | 7.4 | 7.2 |
ドイツ | 0.3 | 0.6 | 1.2 | 3.1 | 3.6 | 5.0 | 5.3 | 6.3 |
フランス | 0.3 | 0.5 | 1.4 | 2.8 | 3.5 | 4.5 | 4.7 | 5.6 |
ポーランド | 0.5 | 0.7 | 1.1 | 1.4 | 1.0 | 1.4 | 2.1 | 2.5 |
イギリス | <0.007 | 0.06 | 0.9 | 1.2 | 1.2 | 1.9 | 2.1 | 2.0 |
オーストラリア | <0.007 | <0.06 | 0.1 | 0.6 | 1.8 | 1.4 | 1.1 | 1.9 |
ウクライナ | <0.007 | <0.06 | <0.03 | <0.1 | 0.1 | 0.3 | 1.0 | 1.9 |
チェコ | 0.07 | 0.1 | 0.3 | 0.7 | 0.8 | 0.7 | 1.0 | 1.1 |
アメリカ合衆国 | <0.007 | <0.06 | <0.03 | 0.2 | 0.9 | 0.7 | 0.7 | 0.7 |
ロシア | N/A | N/A | N/A | 0.1 | 0.1 | 0.3 | 0.6 | 0.7 |
デンマーク | 0.05 | 0.1 | 0.5 | 0.3 | 0.3 | 0.3 | 0.6 | 0.6 |
ベラルーシ | N/A | N/A | N/A | 0.03 | 0.07 | 0.1 | 0.2 | 0.6 |
ハンガリー | 0.008 | 0.1 | 0.1 | 0.1 | 0.2 | 0.3 | 0.5 | 0.6 |
ルーマニア | 0.01 | 0.02 | 0.04 | 0.04 | 0.1 | 0.1 | 0.4 | 0.6 |
World Total | 5.2 | 8.8 | 19.2 | 34.2 | 39.5 | 46.4 | 50.5 | 61.6 |
Source: UN Food & Agriculture Organisation (FAO)[1] |
詳細は「菜の花」を参照
ウィキメディア・コモンズには、Brassica rapaに関連するメディアがあります。 |
The examples and perspective in this article deal primarily with North America and do not represent a worldwide view of the subject. Please improve this article and discuss the issue on the talk page. (May 2012) |
Canola refers to a cultivar of either rapeseed (Brassica napus L.) or field mustard (Brassica campestris L. or Brassica Rapa var.). Its seeds are used to produce edible oil suitable for consumption by humans[1][2] and livestock.[3] The oil is also suitable for use as biodiesel.
Originally, Canola was bred naturally from rapeseed at the University of Manitoba, Canada by Keith Downey and Baldur R. Stefansson in the early 1970s,[4][5] but it has a very different nutritional profile in addition to much less erucic acid.[6] The name "canola" was chosen by the board of the Rapeseed Association of Canada in 1978. The "Can" part obviously refers to Canada but the "ola" part has no real meaning despite several attempts by others to read a meaning into it. There were several other products around at the time using the "ola" tag including Mazola™ or Ricola™ or even Canola™ the name of a Canon Calculator. Genetically modified rapeseed is sometimes referred to as Rapeseed 00. A product known as LEAR (for low erucic acid rapeseed) derived from cross-breeding of multiple lines of Brassica juncea may also be referred to as canola oil and is considered safe for human consumption.[7]
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Canola was developed through conventional plant breeding from rapeseed, an oilseed plant already used in ancient civilization as a fuel. The word “rape” in rapeseed comes from the Latin word “rapum,” meaning turnip. Turnip, rutabaga, cabbage, Brussels sprouts, mustard, and many other vegetables are related to the two natural canola varieties commonly grown, which are cultivars of Brassica napus and Brassica rapa. The change in name serves to distinguish it from natural rapeseed oil, which has much higher erucic acid content.
Hundreds of years ago, rapeseed oil was used as a fuel in lamps in Asia and Europe. The Chinese and Indians used a form of rapeseed oil that was unrefined (natural).[8] Its use was limited until the development of steam power, when machinists found rapeseed oil clung to water- or steam-washed metal surfaces better than other lubricants. World War II saw high demand for the oil as a lubricant for the rapidly increasing number of steam engines in naval and merchant ships. When the war blocked European and Asian sources of rapeseed oil, a critical shortage developed and Canada began to expand its limited rapeseed production.
After the war, demand declined sharply and farmers began to look for other uses for the plant and its products. Rapeseed oil extracts were first put on the market in 1956–1957 as food products, but these suffered from several unacceptable characteristics. Rapeseed oil had a distinctive taste and a disagreeable greenish colour due to the presence of chlorophyll. It also contained a high concentration of erucic acid. Experiments on animals have pointed to the possibility that erucic acid, consumed in large quantities, may cause heart damage, although Indian researchers have published findings that call into question these conclusions and the implication that the consumption of mustard or rapeseed oil is dangerous.[9][10][11][12][13] Feed meal from the rapeseed plant also was not particularly appealing to livestock, due to high levels of sharp-tasting compounds called glucosinolates, and they would not eat it.
A variety developed in 1998 is considered to be the most disease- and drought-resistant Canola variety of rapeseed to date. This and other recent varieties have been produced by using genetic engineering. In 2011 26% of the acres sown were genetically modified (biotech) canola.[14]
Canola was originally a trademark, but is now a generic term for edible varieties of rapeseed oil in North America and Australia. In Canada, an official definition of canola is codified in Canadian law.[15]
Rapeseed was once considered a specialty crop in Canada, but Canola now has become a major American cash crop. Canada and the United States produce between 7 and 10 million tonnes of canola seed per year. Annual Canadian exports total 3 to 4 million tonnes of the seed, 800,000 tonnes of canola oil and 1 million tonnes of canola meal. GM canola may not be grown in jurisdictions that have not approved GMOs. Within the United States, 90% of the canola crop is grown in North Dakota.[16]
Rapeseed is the highest-producing oil-seed crop in the USA. An Oregon State University researcher has determined that growing winter for hybrid Canola seed appears possible in central Oregon, USA, but the state prohibits it from being grown in Deschutes, Jefferson, and Crook counties because it may attract bees away from specialty seed crops such as carrots, which require bees for pollination. The rapeseed blossom is a major source of nectar for honeybees.
The major customers of canola seed are Japan, Mexico, China, and Pakistan, while the bulk of canola oil and meal goes to the United States, with smaller amounts shipped to Mexico, China, and Europe. World production of rapeseed oil in the 2002–2003 season was about 14 million metric tons.[17] In the 2010–2011 season, world production is estimated to be at 58.4 million tonnes.[18] The United States is a net consumer of canola oil, having used 3 billion pounds in 2010, 2.5 billion of which was imported from Canada.[16]
The main price discovery mechanism for worldwide canola trade is the ICE Futures Canada (formerly Winnipeg Commodity Exchange) canola futures contract. Rapeseed is traded on the Euronext exchange.
Canola oil is made at a processing facility by slightly heating and then crushing the seed. Almost all commercial grade canola oil is then refined using hexane. Finally, the crude oil is refined using water precipitation and organic acid, "bleaching" with clay, and deodorizing using steam distillation.[19] Approximately 43% of a seed is oil.[20] What remains is a rapeseed meal that is used as high quality animal feed. 22.68 kg (50 lb) of rapeseed makes approximately 10 L (2.64 US gal) of canola oil. Canola oil is a key ingredient in many foods. Its reputation as a healthy oil has created high demand in markets around the world, and overall it is the third most widely consumed vegetable oil in the world.[21]
The oil has many non-food uses, and often replaces non-renewable resources in products including industrial lubricants, biofuels, candles, lipsticks, and newspaper inks.
The average density of canola oil is 0.92 g/ml.[22]
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Canola oil is low in saturated fat and contains both omega-6 and omega-3 fatty acids in a ratio of 2:1. If consumed, it also reduces Low-density lipoprotein and overall cholesterol levels, and as a significant source of the essential omega-3 fatty acid is associated with reduced all-cause and cardiovascular mortality.[27] It is recognized by many health professional organizations including the Academy of Nutrition and Dietetics and American Heart Association.[28][29][30][31] Canola oil has been given a qualified health claim from the United States Food and Drug Administration due to its high levels of cholesterol-lowering fats.[32]
Although wild rapeseed oil contains significant amounts of erucic acid,[33] a known toxin,[34] the cultivar used to produce commercial, food-grade canola oil was bred to contain less than 2% erucic acid, levels that are not believed to cause harm in humans[35][36] and no health effects have been associated with consumption by humans of the genetically modified oil.[34] Although rumors that canola oil can cause dangerous health problems circulated,[37][38] there is no reason to believe canola oil poses unusual health risks and its consumption in food-grade forms is generally recognized as safe by the United States Food and Drug Administration.[2][35]
Because of the lower levels of the toxic and irritating properties of genetically modified rapeseed oil, Canola oil is a more promising source for manufacturing biodiesel than the natural oil as a renewable alternative to fossil fuels.
Vegetable oils | |||||||
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Type | Saturated fatty acids[39] |
Mono- unsaturated |
Polyunsaturated fatty acids | Oleic acid (ω-9) |
Smoke point | ||
Total poly[39] | linolenic acid (ω-3) |
Linoleic acid (ω-6) |
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Not hydrogenated[40] | |||||||
Canola (rapeseed) | 7.365 | 63.276 | 28.142 | - | - | - | 400 °F (204 °C)[41] |
Coconut | 91.00 | 6.000 | 3.000 | - | 2 | 6 | 350 °F (177 °C)[41] |
Corn | 12.948 | 27.576 | 54.677 | 1 | 58 | 28 | 450 °F (232 °C)[42] |
Cottonseed | 25.900 | 17.800 | 51.900 | 1 | 54 | 19 | 420 °F (216 °C)[42] |
Flaxseed/Linseed (European)[43] | 6 - 9 | 10 - 22 | 68 - 89 | 56 - 71 | 12 - 18 | 10 - 22 | 225 °F (107 °C) |
Olive | 14.00 | 72.00 | 14.00 | - | - | - | 380 °F (193 °C)[41] |
Palm | 49.300 | 37.000 | 9.300 | - | 10 | 40 | 455 °F (235 °C)[44] |
Peanut | 16.900 | 46.200 | 32.000 | - | 32 | 48 | 437 °F (225 °C)[42] |
Safflower (>70% linoleic) |
8.00 | 15.00 | 75.00 | - | - | - | 410 °F (210 °C)[41] |
Safflower (high oleic) |
7.541 | 75.221 | 12.820 | - | - | - | 410 °F (210 °C)[41] |
Soybean | 15.650 | 22.783 | 57.740 | 7 | 54 | 24 | 460 °F (238 °C)[42] |
Sunflower (<60% linoleic) |
10.100 | 45.400 | 40.100 | 0.200 | 39.800 | 45.300 | 440 °F (227 °C)[42] |
Sunflower (>70% oleic) |
9.859 | 83.689 | 3.798 | - | - | - | 440 °F (227 °C)[42] |
Fully hydrogenated | |||||||
Cottonseed (hydrog.) | 93.600 | 1.529 | .587 | .287[39] | |||
Palm (hydrogenated) | 47.500 | 40.600 | 7.500 | ||||
Soybean (hydrogen.) | 21.100 | 73.700 | .400 | .096[39] | |||
Values as percent (%) by weight of total fat. |
A genetically engineered rapeseed that is tolerant to herbicide was first introduced to Canada in 1995. In 2009, 90% of the Canadian crop was herbicide-tolerant.[45] As of 2005, 87% of the canola grown in the US was genetically modified.[46] A 2010 study conducted in North Dakota found glyphosate- or glufosinate-resistance transgenes in 80% of wild natural rapeseed plants, and a few plants that were resistant to both herbicides. The escape of the genetically modified plants has raised concerns that the build-up of herbicide resistance in feral canola could make it more difficult to manage these plants using herbicides. However one of the researchers agrees that ".. feral populations could have become established after trucks carrying cultivated GM seeds spilled some of their load during transportation." She also notes that the GM canola results they found may have been biased as they only sampled along roadsides.[47]
Genetically modified canola has become a point of controversy and contentious legal battles. In one high-profile case (Monsanto Canada Inc. v. Schmeiser) the Monsanto Company sued Percy Schmeiser for patent infringement after he replanted canola seed that he had harvested from his field, which he discovered was contaminated with Monsanto's patented glyphosate-tolerant canola by spraying it with Roundup, leaving only the resistant plants. The Supreme Court ruled that Percy was in violation of Monsanto's patent because he knowingly replanted the resistant seed that he had harvested, but he was not required to pay Monsanto damages since he did not benefit financially from its presence.[48] On 19 March 2008, Schmeiser and Monsanto Canada Inc. came to an out-of-court settlement whereby Monsanto would pay for the clean-up costs of the contamination, which came to a total of $660 Canadian.[49]
In 2003, Australia's gene technology regulator approved the release of canola altered to make it resistant to Glufosinate ammonium, a herbicide.[50] The introduction of the genetically modified crop to Australia generated considerable controversy.[51] Canola is Australia's third biggest crop, and is used often by wheat farmers as a break crop to improve soil quality. As of 2008 the only genetically modified crops in Australia were canola, cotton, and carnations.[52][53]
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リンク元 | 「Brassica rapa」「アブラナ」「rapeseed」「oilseed rape」 |
アブラナ、(変種として)クサイ、(変種として)ブ
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