ABE, Harue

ITO, Takuro

OGURI, Emiko

SUGAWARA, Ryota

SUYAMA, Yoshihisa

TAGANE, Shuichiro

TAGUCHI, Hiroya

TAKAHASHI, Daiki

English

Tohoku University Repository (TOUR) / 東北大学機関リポジトリ

 21Phylogeography of Juniperus Species (Cupressaceae)  with a Disjunct Distribution in the Island Areas of JapanHiroya TAGUCHI1, Daiki TAKAHASHI1, Takuro ITO2, Shuichiro TAGANE3,  Ryota SUGAWARA4,5, Emiko OGURI5, Harue ABE6 and Yoshihisa SUYAMA11Grad. Sch. Agr. Sci., Tohoku Univ. 2Bot. Gardens., Tohoku Univ. 3Kagoshima Univ. Museum 4Tokyo Metropolitan Univ. 5Tokyo Gakugei Univ. 6Sado Isl. Ctr. Ecol. Sustainabil., Niigata Univ.A coastal conifer, Juniperus taxifolia var. lutchuensis (Cupressaceae) is distributed in the Ryukyu Islands, Izu Islands, and a part of the Izu peninsula. This species is treated as a variety of J. taxifolia var. taxifolia which is endemic to the Bonin (Ogasawara) Islands. Since these three Island groups are separated by more than 1,000 km away, it is interesting where this species originated and how it expanded its distribution. On the other hand, J. conferta is distributed in Hokkaido, Honshu, and Kyushu Islands. This species grows in a coastal environment like J. taxifolia var. lutchuensis and the two taxa are distinguished by the traits of their leaves. In areas where distributions of these two species overlap, morphologically intermediate individuals have been reported; however, their phylogenetic relationships are unclear.In this study, we collected 267 samples of 7 Juniperus species including 27 populations of J. taxifolia and J. conferta from Japan and Taiwan Island in order to reveal the phylogeographic relationship among these three taxa. We extracted DNA from leaves by the CTAB method and obtained genome-wide SNPs by the MIG-seq analysis. Based on MIG-seq data, we conducted phylogenetic and population genetic analyses.The result of the phylogenetic analysis indicated that J. taxifolia var. lutchuensis didn’t form a monophyletic clade with var. taxifolia but with J. conferta. Moreover, J. taxifolia var. taxifolia was monophyletic with J. formosana which is endemic to Taiwan Island and southeast of mainland China. The results of the population genetic analyses indicated that J. taxifolia var. lutchuensis from Izu Islands is genetically different from the Ryukyu Islands population and is closely related to J. conferta from Honshu Island. These results suggest that J. taxifolia var. taxifolia originated from Taiwan or mainland China and that J. taxifolia var. lutchuensis has the same origin as J. conferta with some genetic differentiation by expanding its distribution along the coast.PosterPoster 5Photo. Juniperus taxifolia var. lutchuensis in Amami Oshima Island

Phylogeography of Juniperus Species (Cupressaceae) with a Disjunct Distribution in the Island Areas of Japan

https://tohoku.repo.nii.ac.jp/record/2000016/files/JIFS Vol20 - P21 Poster5.pdf

Phylogeography of Juniperus Species (Cupressaceae) with a Disjunct Distribution in the Island Areas of Japan

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