Recent autopolyploidization in a naturalized population of Mimulus guttatus (Phrymaceae)

Recent autopolyploidization in a naturalized population of Mimulus guttatus (Phrymaceae)
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酸浆草(Phrymacaceae)归化种群的近期自多倍化

DOI:
10.1093/botlinnean/box052
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发表时间:
2017
影响因子:
2.4
通讯作者:
Simón-Porcar V
Simón-Porcar V
中科院分区:
生物学2区
文献类型:
--
作者:
Simón-Porcar V

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即使没有相关的杂交,多倍化也可以引发形态学、生态学和基因组学的快速变化。然而,从随后在多倍体谱系中积累的进化变化中解开基因组复制的直接生物学后果需要鉴定和分析最近形成的多倍体。我们调查了多倍体的发生率在引进人口ofMimulus guttatus在英国和报告发现一个新的混合二倍体同源多倍体人口在设得兰群岛。我们进行了6个设得兰群岛人口的遗传分析,以调查是否四倍体的个人可能起源于当地的二倍体植物和比较四倍体和当地的二倍体的形态,以评估基因组复制的表型后果。同源四倍体在遗传上接近同域二倍体,表明它们起源于本地。从表型上看,全基因组复制导致了倍性之间的明显差异,四倍体表现出延迟的物候和比二倍体更大的花、叶和茎。我们的研究结果支持了新的进化谱系可以通过多倍化快速起源的假设。新发现的非nativeMimulus群体的同源多倍体化事件提供了一个机会,调查在野生多倍体化的早期原因和后果。
Polyploidization can trigger rapid changes in morphology, ecology and genomics even in the absence of associated hybridization. However, disentangling the immediate biological consequences of genome duplication from the evolutionary change that subsequently accumulates in polyploid lineages requires the identification and analysis of recently formed polyploids. We investigated the incidence of polyploidization in introduced populations ofMimulus guttatusin the UK and report the discovery of a new mixed diploid–autopolyploid population in the Shetland Isles. We conducted a genetic analysis of six Shetland populations to investigate whether tetraploid individuals may have originated from local diploid plants and compared the morphology of tetraploids and local diploids to assess the phenotypic consequences of genome duplication. Autotetraploids are genetically close to sympatric diploids, suggesting that they have originated locally. Phenotypically, whole genome duplication has resulted in clear differences between ploidies, with tetraploids showing delayed phenology and larger flowers, leaves and stems than diploids. Our results support the hypothesis that novel evolutionary lineages can rapidly originate via polyploidization. The newly discovered autopolyploidization event in a non-nativeMimuluspopulation provides an opportunity to investigate the early causes and consequences of polyploidization in the wild.
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