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蓝海人类学在线 Ryan WEI's Forum of Anthropology

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Molecular evidence for a single evolutionary origin of domesticated rice

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发表于 2014-3-17 11:47 | 显示全部楼层 |阅读模式
Abstract                           

Asian rice, Oryza sativa, is one of world's oldest and most important crop species. Rice is believed to have been domesticated ∼9,000 y ago, although                              debate on its origin remains contentious. A single-origin model suggests that two main subspecies of Asian rice, indica and japonica, were domesticated from the wild rice O. rufipogon. In contrast, the multiple independent domestication model proposes that these two major rice types were domesticated separately                              and in different parts of the species range of wild rice. This latter view has gained much support from the observation of                              strong genetic differentiation between indica and japonica as well as several phylogenetic studies of rice domestication. We reexamine the evolutionary history of domesticated rice                              by resequencing 630 gene fragments on chromosomes 8, 10, and 12 from a diverse set of wild and domesticated rice accessions.                              Using patterns of SNPs, we identify 20 putative selective sweeps on these chromosomes in cultivated rice. Demographic modeling                              based on these SNP data and a diffusion-based approach provide the strongest support for a single domestication origin of                              rice. Bayesian phylogenetic analyses implementing the multispecies coalescent and using previously published phylogenetic                              sequence datasets also point to a single origin of Asian domesticated rice. Finally, we date the origin of domestication at                              ∼8,200–13,500 y ago, depending on the molecular clock estimate that is used, which is consistent with known archaeological                              data that suggests rice was first cultivated at around this time in the Yangtze Valley of China.


http://www.pnas.org/content/108/20/8351
发表于 2014-3-24 11:19 | 显示全部楼层
与彭头山文化相吻合~
发表于 2014-3-24 21:35 | 显示全部楼层
老文章了,新文章仍支持单一起源,但起源地在珠江流域。
发表于 2014-3-27 00:11 | 显示全部楼层
您是说Nautre2012年的水稻基因组变异的地图揭示栽培稻的这篇文章吗?
这篇结果认为驯化地点是在广西珠江中部
但是是支持水稻单一起源吗?
(之前看一直以为他是说多起源....fig.4的e圖
O.sativa indica 有經過雜交所以跟O.sativa jappnica不同起源
还是说O.sativa indica and O.sativa jappnica都算是同一种所以是单起源)
谢谢

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发表于 2014-3-29 13:51 | 显示全部楼层
您是说Nautre2012年的水稻基因组变异的地图揭示栽培稻的这篇文章吗?
这篇结果认为驯化地点是在广西珠江中部
但是是支持水稻单一起源吗?
(之前看一直以为他是说多起源....fig.4的e圖
O.sativa indica 有經過 ...
ButaKaraho 发表于 2014-3-27 00:11
植物起源和动物起源有一点不同,植物可以跨物种甚至跨属杂交,而动物跨亚种都有可能造成隔离。按我的理解,水稻仍是单一起源,最早是粳稻(也即日本稻),后来传播至东南亚以后与当地野生稻杂交形成籼稻(也即印度稻)。籼稻中含有来自粳稻的基因。粳稻籼稻是不同物种,分布地不同。若是动物的话早就该认为独立起源的了,但植物不行,因此水稻仍是单一起源的。
发表于 2014-3-31 20:25 | 显示全部楼层
老文章了,新文章仍支持单一起源,但起源地在珠江流域。
  ---------------------------------

Finally, we date the origin of domestication at  ~8,200–13,500 y ago, depending on the molecular clock estimate that is used, which is consistent with known archaeological  data that suggests rice was first cultivated at around this time in the Yangtze Valley of China.


长江沿岸有好几个谷地,不过与珠江还是有一段距离的~
发表于 2014-8-3 15:29 | 显示全部楼层
现在的野生稻分布范围与万年前不一定相同吧?
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