Cherleria sedoides, a plant species widespread in alpine areas of the major European mountain ranges and in Scotland, contains two highly divergent chloroplast haplotype groups, one widespread (WH) and one present only in some populations in the Alps (AH). We investigated whether this haplotype diversity is the result of (1) intraspecific differentiation, (2) retention of an ancestral polymorphism or (3) hybridisation. For this purpose, 106 matK sequences from throughout the Caryophyllaceae and 80 trnQ-rps16 and psbD-trnT sequences of C. sedoides (51) and other species of Cherleria (29) were used for the construction of phylogenies and haplotype networks. As the two haplotype groups were never each other’s closest relatives, haplotype diversity as a result of intraspecific differentiation is unlikely. Patterns of genetic differentiation within the WH and AH groups are very different. Whereas WH shows a radial pattern typical of rapid expansion, AH is divided into two divergent subgroups each containing more variation than the WH group. This suggests that the two haplotype groups have dissimilar histories and are therefore unlikely to represent an ancestral polymorphism. Instead, we conclude that the polymorphism is best interpreted as the result of hybridisation. As the WH and AH haplotype groups fall into Cherleria, but do not group with any extant species, we conclude that the rare AH group represents the original C. sedoides, and that the WH group was captured from another, now extinct, species of Cherleria.

中文翻译：

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奇异果（Cheleria sedoides L。）（石竹科）的种内单倍型多样性可以通过从灭绝物种中捕获叶绿体得到最好的解释。

Cherleria sedoides是一种分布在欧洲主要山脉的高山地区和苏格兰的植物，包含两个高度不同的叶绿体单倍型群，一个分布广泛（WH），一个仅存在于阿尔卑斯山的某些种群（AH）。我们调查了这种单倍型多样性是（1）种内分化，（2）祖先多态性保留或（3）杂交的结果。为此，在整个石竹科中有106个matK序列，以及雪松假丝酵母（51）和樱桃属的其他物种的80 trnQ - rps16和psbD - trnT序列。（29）被用来构建系统发育和单倍型网络。由于两个单倍型群体从来不是彼此最接近的亲戚，种内分化导致单倍型多样性的可能性不大。WH和AH组内的遗传分化模式非常不同。WH呈现出典型的快速扩张的径向模式，而AH则分为两个发散的子组，每个子组包含的变异大于WH组。这表明两个单体型组具有不同的历史，因此不太可能代表祖先多态性。相反，我们得出结论，最好将多态性解释为杂交的结果。随着WH和AH单倍型群体落入Cherleria，但不与任何现存物种归为一类，因此我们得出结论，稀有的AH组代表原始的梭状梭菌，WH组是从另一种现已灭绝的Cherleria物种捕获的。