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首页> 外文期刊>Molecular phylogenetics and evolution >Tracking the evolutionary history of polyploidy in Fragaria L. (strawberry): New insights from phylogenetic analyses of low-copy nuclear genes
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Tracking the evolutionary history of polyploidy in Fragaria L. (strawberry): New insights from phylogenetic analyses of low-copy nuclear genes

机译：追踪草莓（草莓）中多倍体的进化史：低拷贝核基因系统发育分析的新见解

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摘要

Phylogenetic utility of two nuclear genes (GBSSI-2 and DHAR) was explored in genus Fragaria in order to clarify phylogenetic relationships among taxa and to elucidate the origin of the polyploid species. Orthology of the amplified products was assessed by several methods. Our results strongly suggest the loss of one GBSSI duplicated copy (GBSSI-1) in the Fragariinae subtribe. Phylogenetic analyses provided new insights into the evolutionary history of Fragaria, such as evidence supporting the presence of three main diploid genomic pools in the genus and demonstrating the occurrence of independent events of polyploidisation. In addition, the data provide evidence supporting an allopolyploid origin of the hexaploid F. moschata, and the octoploids F. chiloensis, F. iturupensis and F. virginiana. Accordingly, a new pattern summarizing our present knowledge on the Fragaria evolutionary history is proposed. Additionally, sequence analyses also revealed relaxed constraints on homoeologous copies at high ploidy level, as demonstrated by deletion events within DHAR coding sequences of some allo-octoploid haplotypes.
机译：为了阐明分类群之间的系统发育关系并阐明多倍体物种的起源，在草莓属中研究了两个核基因（GBSSI-2和DHAR）的系统发生学效用。通过几种方法评估扩增产物的矫正性。我们的结果强烈表明，Fragariinae亚族中丢失了一个GBSSI复制副本（GBSSI-1）。系统发育分析为草莓的进化史提供了新的见解，例如支持该属中存在三个主要二倍体基因组库并证明多倍体化独立事件发生的证据。另外，这些数据提供了支持六倍体毛果念珠菌和八倍体毛鳞鱼，伊图鲁普菌和维吉尼亚扁豆的异源多倍体起源的证据。因此，提出了一种新模式，总结了我们目前对草莓进化史的认识。另外，序列分析还揭示了在高倍性水平上对同源拷贝的宽松限制，如某些同种异型倍体单倍型的DHAR编码序列内的缺失事件所证明的。

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