Phylogeography of Infraspecific Differentiation of Hydrangea serrata (Hydrangeaceae), a Widespread Shrub Species in the Japanese Archipelago

概要

Poster
Poster 2

Phylogeography of Infraspecific Differentiation of
Hydrangea serrata (Hydrangeaceae), a Widespread Shrub Species
in the Japanese Archipelago
Shoki MURAKAMI1,2, Takuro ITO2, Tatsuya UEMACHI3, Shinji FUJII4, Ayumi MATSUO5,
Yoshihisa SUYAMA5 and Masayuki MAKI1,2
1

Graduate School of Life Sciences, Tohoku University
2
Botanical Gardens, Tohoku University
3
School of Environmental Science, The University of Shiga Prefecture
4
Department of Environmental Science, University of Human Environments
5
Graduate School of Agricultural Science, Tohoku University

Hydrangea serrata (Thunb.) Ser. is a deciduous shrub species, distributed throughout Japan and in a part of East Asia. This species
comprises of six varieties, var. serrata, var. acuminata (Siebold et Zucc.) H. Ohba et S. Akiyama, var. yesoensis (Koidz.) H. Ohba,
var. minamitanii H. Ohba, var. australis T. Yamaz., and var. angustata (Franch. et Sav.) H. Ohba (Ohba and Akiyama, 2016); since
their distributions are allopatric in Japan and composes sect. Macrophyllae together with H. macrophylla (De Smet et al., 2015),
H. serrata will be a useful material to understand allopatric speciation in the plants distributed widely in the Japanese Archipelago.
Although several phylogenetic studies of H. serrata have been previously conducted, the phylogenetic relationships among these
varieties remain unclear because of limited information by genetic markers used and incomplete taxon samplings (Uemachi et
al., 2014; Hirota et al., 2022). Therefore, more comprehensive phylogenetic analyses are required to elucidate the phylogenetic
relationships and the history of diversification within sect. Macrophyllae, particularly at infraspecific level of H. serrata.
In this study, we reconstructed an infraspecific phylogeny of H. serrata and estimated divergence time of sect. Macrophyllae,
including H. serrata, from the sister species, based on genome-wide SNPs. Additionally, we reconstructed the ancestral geographic
areas to investigate phylogeographic history of H. serrata.
The phylogenetic trees reconstructed in this study showed the monophyly of most varieties of H. serrata. The divergence time
between sect. Macrophyllae species and the outgroups was estimated to be in the Pleistocene period. The ancestral biogeographic
history of H. serrata suggested some evidence of biogeographic isolations at various scales in the Japanese Archipelago.

Figure. Distributions of varieties of Hydrangea serrata and H. ...

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