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Rice is the seed of the grass species ''Oryza sativa'' (Asian rice) or ''Oryza glaberrima'' (African rice). As a cereal grain, it is the most widely consumed staple food for a large part of the world's human population, especially in Asia. It is the agricultural commodity with the third-highest worldwide production, after sugarcane and maize, according to 2012 FAOSTAT data.〔(Faostat ). Faostat.fao.org (2014-10-23). Retrieved on 2015-09-04.〕 Since a large portion of maize crops are grown for purposes other than human consumption, rice is the most important grain with regard to human nutrition and caloric intake, providing more than one-fifth of the calories consumed worldwide by humans.〔Smith, Bruce D. (1998) ''The Emergence of Agriculture''. Scientific American Library, A Division of HPHLP, New York, ISBN 0-7167-6030-4.〕 Chinese legends attribute the domestication of rice to Shennong, the legendary emperor of China and inventor of Chinese agriculture. Genetic evidence has shown that rice originates from a single domestication 8,200–13,500 years ago〔 in the Pearl River valley region of China.〔 Previously, archaeological evidence had suggested that rice was domesticated in the Yangtze River valley region in China.〔 From East Asia, rice was spread to Southeast and South Asia.〔 Rice was introduced to Europe through Western Asia, and to the Americas through European colonization. There are many varieties of rice and culinary preferences tend to vary regionally. In some areas such as the Far East or Spain, there is a preference for softer and stickier varieties. Rice, a monocot, is normally grown as an annual plant, although in tropical areas it can survive as a perennial and can produce a ratoon crop for up to 30 years.〔. knowledgebank.irri.org 〕 The rice plant can grow to tall, occasionally more depending on the variety and soil fertility. It has long, slender leaves long and broad. The small wind-pollinated flowers are produced in a branched arching to pendulous inflorescence long. The edible seed is a grain (caryopsis) long and thick. Rice cultivation is well-suited to countries and regions with low labor costs and high rainfall, as it is labor-intensive to cultivate and requires ample water. However, rice can be grown practically anywhere, even on a steep hill or mountain area with the use of water-controlling terrace systems. Although its parent species are native to Asia and certain parts of Africa, centuries of trade and exportation have made it commonplace in many cultures worldwide. The traditional method for cultivating rice is flooding the fields while, or after, setting the young seedlings. This simple method requires sound planning and servicing of the water damming and channeling, but reduces the growth of less robust weed and pest plants that have no submerged growth state, and deters vermin. While flooding is not mandatory for the cultivation of rice, all other methods of irrigation require higher effort in weed and pest control during growth periods and a different approach for fertilizing the soil. The name wild rice is usually used for species of the genera ''Zizania'' and ''Porteresia'', both wild and domesticated, although the term may also be used for primitive or uncultivated varieties of ''Oryza''. ==Etymology== First used in English in the middle of the 13th century, the word "rice" derives from the Old French ''ris'', which comes from Italian ''riso'', in turn from the Latin ''oriza'', which derives from the Greek ὄρυζα (''oruza''). The Greek word is the source of all European words (cf. Welsh ''reis'', German ''Reis'', Lithuanian ''ryžiai'', Serbo-Croatian ''riža'', Polish ''ryż'', Dutch ''rijst'', Hungarian ''rizs'', Romanian ''orez'').〔(rice ), Online Etymology Dictionary〕〔(ὄρυζα ), Henry George Liddell, Robert Scott, ''A Greek-English Lexicon'', on Perseus〕 The origin of the Greek word is unclear. It is sometimes held to be from the Tamil word அரிசி (''arisi''), or rather Old Tamil ''arici''. However, Krishnamurti disagrees with the notion that Old Tamil ''arici'' is the source of the Greek term, and proposes that it was borrowed from descendants of Proto-Dravidian *''wariñci'' instead. Mayrhofer suggests that the immediate source of the Greek word is to be sought in Old Iranian words of the types *''vrīz-'' or *''vrinj-'', but these are ultimately traced back to Indo-Aryan (as in Sanskrit ''vrīhí-'') and subsequently to Dravidian by Witzel and others. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「rice」の詳細全文を読む スポンサード リンク
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