Phylogenetic Origin of Cryptomeria japonica on Kinkasan Island in Japan

概要

Poster
Poster 11

Phylogenetic Origin of
Cryptomeria japonica on Kinkasan Island in Japan
Henri ALLEKOTTE, Taguchi HIROYA, Daiki TAKAHASHI and Yoshihisa SUYAMA
Tohoku University, Japan

Sugi ( 杉 ) – Cryptomeria japonica is widely planted throughout Japan accounting for about 44 % of the total area of planted
forests but its natural populations with its original local lineage are limited. Natural forests and local tree lineages are important for
regional biodiversity and future breeding resources. Kinkasan in Miyagi prefecture is known as an island where the natural forest has
been protected; therefore, we thought that it is a candidate for an unknown natural population of the species. Therefore, we wanted to
figure out if the population on the island has a surviving local lineage of this region or not.
We collected 24 samples from the island including individuals from natural habitats as well as planted populations. We also
used reference samples (83 samples from 17 natural populations in Japan and 28 samples from local populations near Kinkasan) to
compare the genetic structure. Genome-wide SNP data was collected with the MIG-seq approach and genetic analysis was conducted
by using Stacks (ver. 2.60), RAxML (ver.8.2.12), and ADMIXTURE (ver. 1.3.0).
The results showed that the eight trees from the natural habitats were supposed to be originated from a local lineage related to
the local populations near Kinkasan. Their values of genetic diversity and inbreeding coefficient are almost the same levels as other
natural populations. In addition, the lineage of the Pacific Ocean side was found in planted populations and partial mixing of the Sea
of Japan side lineage was also observed in some individuals which may indicate genetic disturbance in the natural genetic structure.
The trees with local lineage discovered in this study are important for the conservation of the local genetic resources and diversity.
It is important to consider the conservation of local genetic diversity in upcoming afforestation and restoration projects.

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