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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Angiosperm genome comparisons reveal early polyploidy in the monocot lineage
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Angiosperm genome comparisons reveal early polyploidy in the monocot lineage

机译：被子植物基因组比较显示单子叶植物谱系中的早期多倍体

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摘要

Although the timing and extent of a whole-genome duplication occurring in the common lineage of most modern cereals are clear, the existence or extent of more ancient genome duplications in cereals and perhaps other monocots has been hinted at, but remain unclear. We present evidence of additional duplication blocks of deeper hierarchy than the pancereal rho (p) duplication, covering at least 20% of the cereal transcriptome. These more ancient duplicated regions, herein called σ, are evident in both intragenomic and intergenomic analyses of rice and sorghum. Resolution of such ancient duplication events improves the understanding of the early evolutionary history of monocots and the origins and expansions of gene families. Comparisons of syntenic blocks reveal clear structural similarities in putatively homologous regions of monocots (rice) and eudicots (grapevine). Although the exact timing of the σ-duplication(s) is unclear because of uncertainties of the molecular clock assumption, our data suggest that it occurred early in the monocot lineage after its divergence from the eudicot clade.
机译：尽管在大多数现代谷物的共同谱系中发生全基因组复制的时机和程度是明确的，但已经暗示了谷物和其他单子叶植物中较古老的基因组复制的存在或程度，但仍不清楚。我们提供的证据表明，与pantreal rho（p）复制相比，其他复制块的层次更深，至少覆盖了谷物转录组的20％。这些更古老的重复区域，在本文中称为σ，在水稻和高粱的基因组内和基因组分析中均很明显。解决此类古老的复制事件有助于增进对单子叶植物的早期进化历史以及基因家族起源和扩展的了解。对同位语块的比较揭示了在单子叶植物（大米）和双子叶植物（葡萄树）的推测同源区域中明显的结构相似性。尽管由于分子时钟假设的不确定性，目前尚不清楚σ重复的确切时机，但我们的数据表明，它是在单子叶植物谱系中脱离了双子叶植物进化枝而出现的。

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  • 作者

    Haibao Tang; John E. Bowers; Xiyin Wang; Andrew H. Paterson;

  • 作者单位

    Plant Genome Mapping Laboratory University of Georgia, Athens, GA 30602 Department of Plant Biology, University of Georgia, Athens, GA 30602;

    Plant Genome Mapping Laboratory University of Georgia, Athens, GA 30602 Department of Plant Biology, University of Georgia, Athens, GA 30602;

    Plant Genome Mapping Laboratory University of Georgia, Athens, GA 30602 College of Science, Hebei Polytechnic University, Tangshan, Hebei 063000, China;

    Plant Genome Mapping Laboratory University of Georgia, Athens, GA 30602 Department of Plant Biology, University of Georgia, Athens, GA 30602;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    collinearity; paleopolyploidy; synteny;

    机译：共线性古多倍体连词;

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