The homogenous genetic structure and inferred unique history of range shifts during the Pleistocene climatic oscillations of Arcterica nana (Maxim.) Makino (Ericaceae)
The homogenous genetic structure and inferred unique history of range shifts during the Pleistocene climatic oscillations of Arcterica nana (Maxim.) Makino (Ericaceae)
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DOI：
10.1007/s10265-008-0213-5
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发表时间：
2009-01
影响因子：
2.8
通讯作者：
H. Ikeda;H. Setoguchi
中科院分区：
文献类型：
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作者：
H. Ikeda;H. Setoguchi
先前对日本高山植物的系统地理学研究推断，在更新世气候振荡期间，本州中部的种群持续存在，并表明高山间冰期生存。然而,Arcterica娜娜(格言)。牧野（Ericaceae）在整个日本表现出同质的遗传结构，因此可能具有独特的系统地理历史。这种不一致可能是由于先前分析的叶绿体DNA序列分辨率不足造成的。因此，我们进行了基于扩增片段长度多态性的系统地理学调查。利用21个居群的176个个体，分别采用主坐标分析和邻接树分析确定了个体与居群之间的关系。此外，利用分子方差分析和空间自相关分析估计了遗传分化。这些分析证明了整个日本范围内的同质结构，支持了之前的cpDNA系统地理学。尽管这种遗传结构与其他高山植物的遗传结构不一致，但很难假设先前存在的遗传分化只在a. nana中被淹没。因此，这种同质遗传结构可能是由a种群的不同历史造成的。娜娜。具体来说，在最后一个冰河时期，向南迁移和随后的连续种群使基因在整个日本群岛流动。因此，我们的数据表明，在气候振荡之后，日本群岛的高山植物并不总是经历共同的分布变化。
Previous phylogeographic studies of alpine plants in Japan have inferred that populations in central Honshu persisted during the Pleistocene climatic oscillations and suggested interglacial survival in high mountains. However,Arcterica nana(Maxim.) Makino (Ericaceae) exhibits a homogenous genetic structure throughout Japan and may therefore have a unique phylogeographic history. This inconsistency could have resulted from insufficient resolution of previously analyzed chloroplast DNA sequences. Therefore, we conducted a phylogeographic investigation based on amplified fragment length polymorphisms. Using 176 individuals from 21 populations, the relationships among individuals and populations were determined by principal coordinate analysis and a neighbor-joining tree, respectively. In addition, genetic differentiation was estimated using analysis of molecular variance and spatial autocorrelation analysis. These analyses demonstrate a homogenous structure throughout the entire Japanese range, supporting the previous cpDNA phylogeography. Although this genetic structure is inconsistent with those of other alpine plants, it is difficult to postulate that pre-existing genetic differentiation was swamped exclusively withinA.nana. Therefore, this homogenous genetic structure may have been caused by the distinct history of populations ofA. nana. Specifically, the southern-ward migration and the subsequent continuous populations enabled gene flow throughout the Japanese archipelago during the last glacial period. Thus, our data suggest that alpine plants in the Japanese archipelago did not always experience a shared distribution change following climatic oscillations.