Reconstructing relative genome size of vascular plants through geological time.
Reconstructing relative genome size of vascular plants through geological time.
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DOI：
10.1111/nph.12523
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
B. Lomax;Jason Hilton;Richard M Bateman;G. Upchurch;Janice A Lake;I. Leitch;Avery B. Cromwell;Charles A Knight
中科院分区：
文献类型：
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作者：
B. Lomax;Jason Hilton;Richard M Bateman;G. Upchurch;Janice A Lake;I. Leitch;Avery B. Cromwell;Charles A Knight
在动物和植物中细胞和基因组大小之间明显的强正相关关系形成了使用气孔保卫细胞的大小作为代理来跟踪植物基因组大小在地质时期的变化的基础。我们报告的第一次分类细尺度调查气孔保卫细胞长度的变化，并使用这些数据来推断基因组大小的变化，通过陆地植物的进化历史。我们的数据表明，许多最早的陆地植物具有非常大的基因组大小，并且预测的通过地质时间在个体谱系内增加基因组大小的总体趋势不被支持。然而，最大基因组大小从密西西比河（c.）开始稳步增加。3.6亿年前（Ma））到现在。我们假设气孔大小，基因组大小和大气CO2之间的功能关系可能有助于二分法报道之间的优惠灭绝的neopolyploids和现存维管植物的DNA序列数据中观察到的palaeopolyploidy的患病率。
The strong positive relationship evident between cell and genome size in both animals and plants forms the basis of using the size of stomatal guard cells as a proxy to track changes in plant genome size through geological time. We report for the first time a taxonomic fine-scale investigation into changes in stomatal guard-cell length and use these data to infer changes in genome size through the evolutionary history of land plants. Our data suggest that many of the earliest land plants had exceptionally large genome sizes and that a predicted overall trend of increasing genome size within individual lineages through geological time is not supported. However, maximum genome size steadily increases from the Mississippian (c. 360 million yr ago (Ma)) to the present. We hypothesise that the functional relationship between stomatal size, genome size and atmospheric CO2 may contribute to the dichotomy reported between preferential extinction of neopolyploids and the prevalence of palaeopolyploidy observed in DNA sequence data of extant vascular plants.