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 All cultivated rice originated in China

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dragon warrior

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Join date : 2012-10-06

PostSubject: All cultivated rice originated in China    Sun Oct 07, 2012 12:05 am

All cultivated rice originated in China

PARIS The mother of all cultivated rice was grown on Chinas Pearl River,according to a published DNA map.
The first domesticated strain of rice was Oryza sativa japonica,which was grown thousands of years ago from wild rice in the middle of the Pearl River in southern China,says the study,published in Nature.
One of the Big Three crops that feed the world along with wheat and corn,rice today has diverged into hundreds of varieties.
Cultivated rice divides into two major sub-species Oryza sativa japonica,which is short-grained and glutinous,and Oryza sativa indica,which is long-grained and non-sticky.
Researchers led by Bin Han of Shanghai Institute for Biological Sciences put together a gigantic database to compare tiny single-letter changes in rice DNA.
Their trawl covered 446 geographically diverse types of wild rice (Oryza rufipogon) the ancestral progenitor of commercially farmed rice and 1,083 varieties of japonica and indica.By putting together a family tree,the researchers say they can disprove theories that indica rice was domesticated separately from wild rice.
Instead,the first indica was a cross between japonica and wild rice.AGENCIES

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