另一种理论提出粳稻和籼稻这两种主要的水稻亚种是在亚洲不同地区分别被培育的。
Another theory proposes that the two major sub-species of rice - Oryza sativa japonica and O. sativa indica - were domesticated separately and in different parts of Asia.
研究表明粳稻和籼稻大约在3900年前才由同一种水稻分化成两种不同的亚种。
The study indicates that the japonica and indica sub-species split apart from each other about 3, 900 years ago.
研究人员发现，籼稻和粳稻彼此的相同点多于它们各自与野生水稻的相似处。
The researchers found indica and japonica have more in common with each other than either has with wild rice.
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