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首页> 外文期刊>International journal of plant sciences >GENOME SIZE VARIATION IN A HYBRIDIZING DIPLOID SPECIES COMPLEX IN ANACYCLUS (ASTERACEAE: ANTHEMIDEAE)
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GENOME SIZE VARIATION IN A HYBRIDIZING DIPLOID SPECIES COMPLEX IN ANACYCLUS (ASTERACEAE: ANTHEMIDEAE)

机译：Anacyclus中杂交二倍体物种复合物的基因组大小变化（Asteraceae：Anthemideae）

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摘要

Premise of research. Interspecific hybridization was hypothesized to explain the remarkable floral pheno-type variation found in overlapping areas of distribution for several Anacyclus species. We aimed to investigate genome size in natural populations of three diploid Anacyclus species with special emphasis in their contact areas to explore patterns of variation as additional evidence supporting current hybridization in these areas. Methodology. Flow cytometry was used to estimate the genome size of 564 individuals of the species complex of A. clavatus, A. homogamos, and A. valentinus from 30 sites. Additionally, genome size variation of 173 first-generation synthetic hybrids between these three species was also studied and compared with the estimates obtained in sympatric sites. Pivotal results. Differences in genome size between A. clavatus and A. valentinus were significant in non-overlapping areas of species distribution, whereas in overlapping areas, the variation increased, preventing a clear differentiation between species. In sympatric sites of A. clavatus and A. valentinus, individuals with intermediate genome sizes between them were also observed and were significantly similar to those obtained from the first-generation experimental hybrids between these species. Genome sizes of A. clavatus and A. homogamos did not differ enough to allow discrimination between these species. Conclusions. The patterns of genome size variation observed in sympatric populations of A. clavatus and A. valentinus support the occurrence of current gene flow between these species and the existence of contact areas in overlapping distribution areas where phenotypic and genomic variation increases.
机译：研究的前提。假设三种杂交以解释用于几种ancyclus物种的重叠分布区域中发现的显着花卉苯型变化。我们旨在探讨三个二倍体ancyclus物种的自然群体的基因组大小，特别强调其接触区域，以探讨各种证据的变异模式，支持这些领域的当前杂交。方法。流式细胞术用于估计564个单独的A. clavatus，A. homogamos和A. Valentinus的种类大小的基因组大小。另外，还研究了这三种物种之间的173个第一代合成杂种的基因组大小的变化，并与Sympatric位点中获得的估计进行比较。关染术。 A.Clavatus和A. Valentinus之间的基因组大小的差异在物种分布的非重叠区域中显着，而在重叠区域中，变异增加，预防物种之间的明显分化。在A.Clavatus和A. Valentinus的Sympatric位点，还观察到它们之间的中间基因组大小的个体，并且与这些物种之间的第一代实验杂交物中获得的那些有显着类似。 A. clavatus和A.同性恋的基因组大小没有足够的差异来允许这些物种之间的歧视。结论。在A. clavatus和A.Valencus的Sympatric群体中观察到的基因组大小变化的模式支持这些物种之间的当前基因流的发生，以及在表型和基因组变异的重叠分布区域中的接触区域的存在。

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  • 来源
    《International journal of plant sciences》 |2019年第5期|374-385|共12页
  • 作者

    Alicia B. Agudo; Ruben Torices; Joao Loureiro; Silvia Castro; Mariana Castro; Ines Alvarez;

  • 作者单位

    Departamento de Biodiversidad y Conservacion Real Jardfn Botanico Consejo Superior de Investigaciones Cientificas Plaza de Murillo 2 Madrid 28014 Spain;

    Area of Biodiversity and Conservation Universidad Rey Juan Carlos Tulipan s Mostoles Madrid E-28933 Spain Department of Life Sciences Centre for Functional Ecology University of Coimbra Calcada Martim de Freitas Coimbra 3000-456 Portugal;

    Department of Life Sciences Centre for Functional Ecology University of Coimbra Calcada Martim de Freitas Coimbra 3000-456 Portugal;

    Department of Life Sciences Centre for Functional Ecology University of Coimbra Calcada Martim de Freitas Coimbra 3000-456 Portugal Botanic Garden of the University of Coimbra Calcada Martim de Freitas Coimbra 3000-456 Portugal;

    Department of Life Sciences Centre for Functional Ecology University of Coimbra Calcada Martim de Freitas Coimbra 3000-456 Portugal;

    Departamento de Biodiversidad y Conservacion Real Jardfn Botanico Consejo Superior de Investigaciones Cientificas Plaza de Murillo 2 Madrid 28014 Spain;

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  • 关键词

    Compositae; flow cytometry; genome evolution; homoploid hybridization;

    机译：compositae;流式细胞仪;基因组进化;同性金杂交;

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