Population genetic analysis of two species of Distylium: D. racemosum growing in East Asian evergreen broad-leaved forests and D. lepidotum endemic to the Ogasawara (Bonin) Islands
Population genetic analysis of two species of Distylium: D. racemosum growing in East Asian evergreen broad-leaved forests and D. lepidotum endemic to the Ogasawara (Bonin) Islands
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DOI：
10.1007/s11295-019-1386-x
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发表时间：
2019-10
影响因子：
2.4
通讯作者：
Hitomi Yagi;Jie Xu;N. Moriguchi;Ryutaro Miyagi;Etsuko Moritsuka;Eri Sato;Kyoko Sugai;S. Setsuko;T. Torimaru;Shin‐ichi Yamamoto;Aya Takahashi;K. Tamura;H. Tachida;Kosuke M. Teshima;Junko Kusumi
中科院分区：
文献类型：
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作者：
Hitomi Yagi;Jie Xu;N. Moriguchi;Ryutaro Miyagi;Etsuko Moritsuka;Eri Sato;Kyoko Sugai;S. Setsuko;T. Torimaru;Shin‐ichi Yamamoto;Aya Takahashi;K. Tamura;H. Tachida;Kosuke M. Teshima;Junko Kusumi
尽管在基因组水平上已经研究了几种模式生物种群的遗传结构，但仍有相当多的具有重要生态意义或进化意义的物种，如海洋岛屿上的特有物种，其遗传变异尚未得到研究。对这些物种的遗传学研究可能会为我们的进化知识增添新的见解，特别是在伴随着物种的生态和地质知识的情况下。本研究对金缕梅科两个生活在不同生境、形态特征各异的近缘种--总状金缕梅和鳞叶金缕梅的遗传变异进行了分析。lepidotumis是小笠原群岛特有的干燥灌木中的一种优势灌木。我们分析了95个样本的112个蛋白质编码位点的核苷酸变异，并根据这些数据推断种群结构和人口统计历史。结果表明，两种二柱兰属植物的样品在遗传上可聚为三个类群：二柱兰属D. racemosum、大花盾壳霉D. lepidotumin的Chichijima岛，和D.叶岛的鳞虫。此外，D.总状体sumappears已经分歧第一约10百万年前（MYA），然后，分裂的两个种群的D。lepidotumoccurred约1 MYA。此外，我们发现了几个候选位点，可能有助于适应的物种或当地人口的探索模式的变化和物种之间使用thefst离群值的方法。
Although the genetic structures of populations in several model organisms have been studied even at the genomic level, quite a few ecologically important or evolutionary interesting species, such as endemic species on oceanic islands, exist whose genetic variations have not yet been studied. Genetic studies of those species may add new insights to our knowledge of evolution, especially when accompanied with ecological and geological knowledge of the species. In this study, we analyzed the genetic variation of two related species of Hamamelidaceae,Distylium racemosumandDistylium lepidotum, living in different habitats and possessing distinctive morphological characteristics.Distylium racemosumis one of the dominant trees of broad-leaved evergreen forests in Japan, andD. lepidotumis a dominant shrub in dry scrub endemic to the Ogasawara Islands. We analyzed the nucleotide variation at 112 protein-coding loci in 95 samples for the twoDistyliumspecies and inferred population structure and demographic history on the basis of these data. Our results showed that the samples from twoDistyliumspecies were genetically clustered into the following three groups:D. racemosum,D. lepidotumin the Chichijima Island, andD. lepidotumin the Hahajima Island. Furthermore,D. racemosumappears to have diverged first approximately 10 million years ago (MYA), and, then, the split of two populations ofD. lepidotumoccurred around 1 MYA. Additionally, we detected a few candidate loci that may contribute to adaptation of the species or local populations by exploring the pattern of the variation within and between species using theFST-outlier approach.