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

Hitomi Yagi, Jie Xu, Natsuki Moriguchi, Ryutaro Miyagi, Etsuko Moritsuka, Eri Sato, Kyoko Sugai, Suzuki Setsuko, Takeshi Torimaru, Shin ichi Yamamoto, Aya Takahashi, Koichiro Tamura, Hidenori Tachida, Kosuke M. Teshima, Junko Kusumi

研究成果: ジャーナルへの寄稿学術誌査読

3 被引用数 (Scopus)

抄録

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 racemosum and Distylium lepidotum, living in different habitats and possessing distinctive morphological characteristics. Distylium racemosum is one of the dominant trees of broad-leaved evergreen forests in Japan, and D. lepidotum is 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 two Distylium species and inferred population structure and demographic history on the basis of these data. Our results showed that the samples from two Distylium species were genetically clustered into the following three groups: D. racemosum, D. lepidotum in the Chichijima Island, and D. lepidotum in the Hahajima Island. Furthermore, D. racemosum appears to have diverged first approximately 10 million years ago (MYA), and, then, the split of two populations of D. lepidotum occurred 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 the FST-outlier approach.

本文言語英語
論文番号77
ジャーナルTree Genetics and Genomes
15
6
DOI
出版ステータス出版済み - 12月 1 2019

!!!All Science Journal Classification (ASJC) codes

  • 林業
  • 分子生物学
  • 遺伝学
  • 園芸学

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