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首页> 外文期刊>Polar biology >Genome size and chromosome number of ten plant species from Kerguelen Islands
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Genome size and chromosome number of ten plant species from Kerguelen Islands

机译：基因组大小和核心群岛10种植物数量

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摘要

Kerguelen Islands harbor a unique, probably very ancient flora with a high rate of endemism. However, the evolutionary history and characteristics of this flora still require investigation. This concerns in particular genome size and ploidy level variation, despite the evolutionary and ecological significance of those traits. Here we report the first assessment of genome size, using flow cytometry, for eight plant species of which two are endemics of Kerguelen Islands and four of the South Indian Ocean Province. The 2C DNA value ranged from 1.08 pg forPringlea antiscorbuticato 11.88 pg forRanunculus biternatus.The chromosome numbers ofColobanthus kerguelensis(2n = 80),Lyallia kerguelensis(2n = 96) andPoa kerguelensis(2n = 28) were also reported in this study for the first time. Overall, our data allowed to infer that all Kerguelen studied species are polyploid (from tetra- to octopolyploid). Intra-genus comparisons showed significant differences of 2C DNA values amongPoaand amongRanunculusspecies, despite their identical ploidy level. In addition, our data highlight the existence of an intraspecific variability of genome size for the two octoploid speciesColobanthus kerguelensisandLyallia kerguelensis. Finally, our data also support the hypothesis regarding which polyploidy may have played a major role in the adaptation of flowering plants to high latitudes, as it has been suggested for arctic species.
机译：Kerguelen Islands港口独特，可能是非常古老的植物群，具有很高的家长率。然而，这种植物群的进化历史和特征仍需要调查。尽管这些特征的进化和生态学意义，但这种情况尤其是基因组大小和倍率水平变异。在这里，我们报告了使用流式细胞术的基因组大小的第一次评估，其中八种植物种类是kergucen群岛和南印度洋省的四种。 2C DNA值范围从1.08 pg forpringlea antismorbuticato 11.88 pg forRanunculus biternatus。在本研究中也首次报道了Colobanthus kergulensis（2n = 80），Lyallia kerguelensis（2n = 96）和kerguelensis（2n = 28）的染色体数量。总体而言，我们的数据允许推断所有kerguelen学习的物种是多倍体（来自四到八屈屈曲的）。尽管它们相同的倍性水平，但基因内的比较表现出的2C DNA值显着差异。此外，我们的数据突出了两种八倍增曲底杆菌kerguelensisandallia kerguelensis的基因组大小的内部内部变异性的存在。最后，我们的数据也支持关于哪种多倍体可能在开花植物对高纬度的适应中发挥了重要作用的假设，因为它已经提出了北极物种。

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  • 来源
    《Polar biology》 |2020年第12期|1985-1999|共15页
  • 作者

    Siljak-Yakovlev Sonja; Lamy Francoise; Takvorian Najat; Valentin Nicolas; Gouesbet Valerie; Hennion Francoise; Robert Thierry;

  • 作者单位

    Univ Paris Saclay Ecol Systemat Evolut AgroParisTech CNRS F-91405 Orsay France;

    Univ Paris Saclay Ecol Systemat Evolut AgroParisTech CNRS F-91405 Orsay France|Univ Versailles St Quentin Dept Biol 45 Bd Etats Unis F-78035 Versailles France;

    Univ Paris Saclay Ecol Systemat Evolut AgroParisTech CNRS F-91405 Orsay France|Sorbonne Univ UFR 927 4 Pl Jussieu 75252 F-75252 Paris 05 France;

    Univ Paris Saclay Inst Integrat Biol Cell I2BC CNRS CEA F-91198 Gif Sur Yvette France;

    Univ Rennes 1 CNRS OSUR Ecosyst Biodiversite Evolut UMR 6553 ECOBIO F-35042 Rennes France;

    Univ Rennes 1 CNRS OSUR Ecosyst Biodiversite Evolut UMR 6553 ECOBIO F-35042 Rennes France;

    Univ Paris Saclay Ecol Systemat Evolut AgroParisTech CNRS F-91405 Orsay France|Sorbonne Univ UFR 927 4 Pl Jussieu 75252 F-75252 Paris 05 France;

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  • 正文语种 eng
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  • 关键词

    2C DNA value; Endemic species; Flow cytometry; Genome size; Ploidy level; Sub-Antarctic flora;

    机译：2C DNA值;流动性物种;流式细胞术;基因组大小;倍性水平;亚南极菌群;

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