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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Molecular evidence for a single evolutionary origin of domesticated rice
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Molecular evidence for a single evolutionary origin of domesticated rice

机译：驯化水稻单一进化起源的分子证据

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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 rese-quencing 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.
机译：亚洲水稻Oryza sativa是世界上最古老，最重要的农作物之一。人们相信稻米已经被驯化了大约9000年前，尽管有关其起源的争论仍然存在争议。一个单一来源的模型表明亚洲稻的两个主要亚种是in稻和粳稻。是从野生稻rufipogon驯化而来的。相比之下，多重独立驯化模型建议将这两种主要水稻类型分别驯化，并在野生稻物种范围的不同部分进行驯化。观察in稻和粳稻之间的强遗传差异以及对水稻驯化的一些系统发育研究，后一种观点获得了很大的支持。我们通过重新测序来自野生和驯化稻种不同集合的630、8、10和12号染色体上的基因片段，来重新审视驯化稻谷的进化历史。使用SNPs的模式，我们在栽培水稻的这些染色体上鉴定出20个推定的选择性扫描。基于这些SNP数据的人口统计模型和基于扩散的方法为水稻的单个驯化起源提供了最有力的支持。进行多物种合并并使用先前发布的系统发育序列数据集的贝叶斯系统发育分析还指出了亚洲驯化稻的单一起源。最后，根据所使用的分子钟估计，我们将驯化的起源定为约8,200-13,500年前，这与已知的考古数据一致，后者表明水稻大约在这个时间在中国长江流域首次种植。

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    Jeanmaire Molina; Martin Sikora; Nandita Garud; Jonathan M. Flowers; Samara Rubinstein; Andy Reynolds; Pu Huang; Scott Jackson; Barbara A. Schaal; Carlos D. Bustamante; Adam R. Boyko; Michael D. Purugganan;

  • 作者单位

    Department of Biology and Center for Genomics and Systems Biology, New York University, New York, NY 10003;

    Department of Genetics, Stanford University, Stanford, CA 94305;

    Department of Genetics, Stanford University, Stanford, CA 94305;

    Department of Biology and Center for Genomics and Systems Biology, New York University, New York, NY 10003;

    Department of Biology and Center for Genomics and Systems Biology, New York University, New York, NY 10003;

    Department of Genetics, Stanford University, Stanford, CA 94305;

    Department of Biology, Washington University, St. Louis, MO 63130;

    Department of Agronomy, Purdue University,West Lafayette, IN 47907;

    Department of Biology, Washington University, St. Louis, MO 63130;

    Department of Genetics, Stanford University, Stanford, CA 94305;

    Department of Genetics, Stanford University, Stanford, CA 94305;

    Department of Biology and Center for Genomics and Systems Biology, New York University, New York, NY 10003;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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