Population Genetic Structure of a Bamboo Taxon, Pleioblastus Sect. Pleioblastus, in the Ryukyu Islands Formed by Geohistory and Human Activity

概要

Poster
Poster 7

Population Genetic Structure of a Bamboo Taxon,
Pleioblastus Sect. Pleioblastus, in the Ryukyu Islands
Formed by Geohistory and Human Activity
Mana MOTOMIYA1, Daiki TAKAHASHI1, Shuichiro TAGANE2, Akiyo NAIKI3, Kenta WATANABE4,
Takuro ITO5 and Yoshihisa SUYAMA1
1

Tohoku Univ.
Kagoshima Univ. Museum
3
TBRC, Univ. Ryukyus, NIT
4
Okinawa KOSEN, 5Tohoku Univ. Bot. Gard.
2

In island ecosystems, past geohistorical events, such as the formation of land bridges and trenches, have strongly influenced the
distribution of organisms that constitute the ecosystem. However, some plant species commonly used in human life may be influenced
by significant anthropogenic effects on their distribution and population genetic structure. In this study, we focused on a bamboo
taxon, Pleioblastus Sect. Pleioblastus (P. hindsii sensu Nakai, P. linearis, P. gramineus and P. gozadakensis), which have been used
in human life in the Ryukyu Islands. A total of 187 ramets from 11 islands were collected for population genetic analysis using the
MIG-seq methods. First, the clone identification analysis revealed that several identical genets were found tens of kilometers apart
on the same island, and even from different islands separated by the ocean. Such long-distance dispersal could not be expected under
natural conditions, suggesting that their distribution is due to human transplantation and propagation. On the other hand, the results of
population genetic structure analysis excluding these widely distributed genets indicated that distinct local genetic clusters are formed
in the islands as observed in other organisms. These results clearly demonstrate not only geological history, but also human activities
have a strong impact on the distribution and formation of population genetic structure in human-related plant species.

Left Photo. A high-density population of P. linearis at Cape Miyako, Amami Oshima Island which is considered to
be a natural distribution.
Right Photo. P. linearis growing on the roadside at Amami Oshima Island which is considered to be a planted
population. ...

この論文で使われている画像