Speciation Success of Polyploid Plants Closely Relates to the Regulation of Meiotic Recombination.

Speciation Success of Polyploid Plants Closely Relates to the Regulation of Meiotic Recombination.
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DOI:
10.3389/fpls.2018.00907
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发表时间:
2018
影响因子:
5.6
通讯作者:
Chèvre AM
Chèvre AM
中科院分区:
生物学2区
文献类型:
--
作者:
Pelé A;Rousseau-Gueutin M;Chèvre AM

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多倍化是一种普遍现象,尤其是在其进化历史中都经历过至少一次全基因组复制事件的开花植物中。因此,包括世界上许多作物在内的大量植物结合了来自同一物种(同源多倍体)或相关物种(异源多倍体)的两组以上染色体。根据多倍体形成途径,将促进不同的重组模式,从而调节杂合性水平。具有高水平杂合性的多倍体群体将产生更多遗传多样性的后代。其中一些个体可能表现出对不同生态位的更好适应能力,从而增加了通过自然选择成功定居的机会。幼年多倍体存活的另一个条件是形成平衡良好的配子,以确保足够的生育能力。在这篇综述中,我们讨论了多倍体形成途径、减数分裂行为和重组调控对多倍体物种形成成功和维持的影响。
Polyploidization is a widespread phenomenon, especially in flowering plants that have all undergone at least one event of whole genome duplication during their evolutionary history. Consequently, a large range of plants, including many of the world’s crops, combines more than two sets of chromosomes originating from the same (autopolyploids) or related species (allopolyploids). Depending on the polyploid formation pathway, different patterns of recombination will be promoted, conditioning the level of heterozygosity. A polyploid population harboring a high level of heterozygosity will produce more genetically diverse progenies. Some of these individuals may show a better adaptability to different ecological niches, increasing their chance for successful establishment through natural selection. Another condition for young polyploids to survive corresponds to the formation of well-balanced gametes, assuring a sufficient level of fertility. In this review, we discuss the consequences of polyploid formation pathways, meiotic behavior and recombination regulation on the speciation success and maintenance of polyploid species.
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