TY - JOUR
T1 - Population genetic analysis of two species of Distylium
T2 - D. racemosum growing in East Asian evergreen broad-leaved forests and D. lepidotum endemic to the Ogasawara (Bonin) Islands
AU - Yagi, Hitomi
AU - Xu, Jie
AU - Moriguchi, Natsuki
AU - Miyagi, Ryutaro
AU - Moritsuka, Etsuko
AU - Sato, Eri
AU - Sugai, Kyoko
AU - Setsuko, Suzuki
AU - Torimaru, Takeshi
AU - Yamamoto, Shin ichi
AU - Takahashi, Aya
AU - Tamura, Koichiro
AU - Tachida, Hidenori
AU - Teshima, Kosuke M.
AU - Kusumi, Junko
N1 - Funding Information:
This research was partially supported by the JSPS, grant numbers JP26291082 (HT), JP16H02553 (HT), and 16K07466 (JK) and 2331067 (SS) and the Environment Research and Technology Development Fund of the Ministry of the Environment, Japan (4-1402, SS).
Funding Information:
We thank two anonymous reviewers and the Associate Editor for their thoughtful comments on an earlier version of this manuscript. We thank Atsuya Kamei, Makiko Mimura, Atsushi Sakai, and Naoyuki Nishimura for helping us to collect samples used in this study. The sequences data from this study have been submitted to the DDBJ Sequence Read Archive (SRA) (https://www.ddbj.nig.ac.jp/dra/index.html) under Accession No. DRA008576.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - 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.
AB - 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.
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U2 - 10.1007/s11295-019-1386-x
DO - 10.1007/s11295-019-1386-x
M3 - Article
AN - SCOPUS:85073693211
VL - 15
JO - Tree Genetics and Genomes
JF - Tree Genetics and Genomes
SN - 1614-2942
IS - 6
M1 - 77
ER -