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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Allopolyploid speciation in Persicaria (Polygonaceae): Insights from a low-copy nuclear region
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Allopolyploid speciation in Persicaria (Polygonaceae): Insights from a low-copy nuclear region

机译：波斯菊科（禾本科）的同种多倍体物种形成：来自低拷贝核区域的见解

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摘要

Using a low-copy nuclear gene region (LEAFY second intron) we show multiple instances of allopolyploid speciation in Persicaria (Polygonaceae), which includes many important weeds. Fifteen species seem to be allopolyploids, which is higher than the number found in previous comparisons of chloroplast DNA and nuclear ribosomal internal transcribed spacer (nrlTS) phylogenies. This underestimation of the extent of allopolyploidy is due in at least three cases to homogenization of nrlTS toward the maternal lineage. One of the diploid species, P. lapathifolia. has been involved in at least six cases of allopolyploid speciation. Of the diploids, this species is the most widespread geographically and ecologically and also bears more numerous and conspicuous flowers, illustrating ecologic factors that may influence hybridization frequency. With a few exceptions, especially the narrowly endemic hexaploid, P. puritanorum, the allopolyploid species also are widespread, plastic, ecological generalists. Hybridization events fostered by human introductions may be fueling the production of new species that have the potential to become aggressive weeds.
机译：使用低拷贝核基因区域（LEAFY第二内含子），我们显示了波斯菊科（禾本科）中多倍体物种形成的多个实例，其中包括许多重要的杂草。似乎有15种是同素多倍体，比以前的叶绿体DNA和核糖体内部转录间隔子（nrlTS）系统发育比较中发现的数量更高。至少在三种情况下，同质多倍体程度的这种低估是由于nrlTS朝向母体谱系的均质化。二倍体物种之一，P。lapathifolia。至少参与了六倍多倍体物种形成的病例。在二倍体中，该物种在地理和生态上是最广泛的，并且还拥有更多且明显的花，说明了可能影响杂交频率的生态因素。除少数例外，特别是狭窄的地方性六倍体P. puritanorum，异源多倍体物种也是广泛的，可塑性的，生态学上的通才。由人类引进而引起的杂交事件可能正在推动新物种的生产，这些物种有可能成为侵略性杂草。

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