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首页> 外文期刊>Nordic Journal of Botany >Ploidy level analysis of apomictic Hieracium (Asteraceae) reveal unexpected patterns and variation
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Ploidy level analysis of apomictic Hieracium (Asteraceae) reveal unexpected patterns and variation

机译：单性生殖的倍性水平分析Hieracium(菊科)揭示意想不到的模式和变异

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摘要

The DNA ploidy level of 673 accessions belonging to 238 species of Hieracium have been analyzed by flow cytometry. 222 of the species were of Scandinavian origin as members of the exclusively apomictic H. sectt. Bifida, Hieracium, Oreadea, Tridentataand Vulgata. For the overwhelming majority of the species, the ploidy level (or chromosme number) has never been investigated before. Approximately 50% of the Scandinavian species, previously believed to be exclusively triploid, were found to be tetraploid. In addition, two pentaploid samples, viz. H. intermarginatum Johanss. & Sam. from Sweden and H. cf. plumbeum Blytt & Fr. from Germany, were found. Although two or more accessions from geographically remote sites were analyzed for approximately 50% ofthe Scandinavian species, only 2 (<2%) taxonomically undisputed species were found to consist of plants with more than one ploidy level. An intriguing pattern was revealed among Scandinavian members of H. sectt. Bifida and Vulgata when ploidy level andmorphometric variation was compared, viz. the most typical or extreme representatives of these sections were found to be exclusively triploid whereas tetraploids dominate among species with intermediate morphology and among species morphologically intermediate between these sections and H. sect. Hieracium. This pattern may indicate that the tetraploids, which tend to have mainly northern distributions, have originated as the result of rare sexual hybridizations between triploid members of different sections, plausibly during or after the northward migration of the parental linages after the last glaciation. The results are believed to be highly relevant for understanding the processes of evolution and speciation within the predominantly apomictic genus Hieracium, but it is emphazised that additional data from e.g. molecular markers and pollen viability analysis are needed before any trustworthy conclusions can be made as far as evolutionary processes are concerned.
机译：673年的DNA倍性水平到达归属感分析了238种Hieracium流式细胞术。斯堪的纳维亚来源作为专门的成员单性生殖的h . sectt。Tridentataand Vulgata。大多数物种(或的倍性水平chromosme数字)从来没有被调查之前。物种,以前认为是独家三倍体、四倍体被发现。另外,两个五倍的样本,即。H。intermarginatum约翰斯。h .参看plumbeum Blytt & Fr.来自德国发现。远程站点地理位置进行了分析大约50%斯堪的纳维亚的物种,只有2(< 2%)分类学的无可争议的物种被发现由植物多吗一倍性水平。显示在斯堪的纳维亚h . sectt的成员。裂和Vulgata倍性水平andmorphometric变化比较,viz.最典型的或极端的代表专门三倍体部分被发现而四倍体物种中占据主导地位中间形态和物种间形态之间的中间部分和h Hieracium教派。往往表明,四倍体北部主要分布,起源于罕见性之间的杂交过程的结果三倍体成员不同的部分,合理的期间或之后的向北迁移最后一个冰期后父母的行数。结果被认为是高度相关的理解进化的过程在主要是单性生殖的物种形成属Hieracium,但emphazised从如分子标记和额外的数据花粉之前需要可行性分析可以到可信的结论进化过程。

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