著者

Wita Yulianti Saeko Katoh Norimasa Sugita Goro Kokubugata Hidetoshi Kato Noriaki Murakami

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.73, no.1, pp.1-18, 2022-02-28 (Released:2022-03-25)

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Invasive alien species are serious threats to the biota of the Ogasawara Islands, and Morus australis is one of them. To clarify the invasion routes and the genetic composition of the founding populations, plant samples were collected from 32 populations of M. australis from Japan, including 12 from the Ogas- awara Islands, for population genetic analyses using 14 microsatellite markers. The UPGMA dendro- gram based on Nei’s genetic distance, Principal Coordinate Analysis based on pairwise F ST values, and Bayesian Clustering using STRUCTURE software indicated that the populations of M. australis in the Ogasawara Islands are genetically similar to those in the Ryukyu Islands, but clearly differentiated from those in the Izu Islands and mainland of Japan. The level of genetic diversity in the Ogasawara Islands (A R = 4.24; H E = 0.60) was similar to that in the Ryukyu Islands (A R = 4.70; H E = 0.66). The findings from this study strongly suggested that M. australis plants now in the Ogasawara Islands are descendants of those introduced from the Ryukyu Islands; the numbers of transplanted individuals from the Ryukyu Islands were large. Such high genetic diversity may have enhanced the invasiveness of M. australis in the Ogasawara Islands.

著者

Katsuhiro Yoneoka Kiyotaka Hori Toshifumi Kataoka Tao Fujiwara Atsushi Ebihara Noriaki Murakami

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.74, no.1, pp.1-15, 2023-02-28 (Released:2023-03-15)

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Haplopteris mediosora (Hayata) X. C. Zhang (Pteridaceae), a fern with linear simple fronds is widely distributed at high elevations from the Himalayas through China, the Philippines and Taiwan to Japan. In Japan, sporophytes of H. mediosora were recorded only from Azusa-shiraiwa, a mountain of Okuchichibu region, and have not been seen for over 50 years. The hypothesis that such rare species still persist as gametophytes was proven during this study when gametophytes were found on several mountains in the Oku-chichibu region. Phylogenetic analysis of rbcL sequences collected in this study demonstrated that the gametophytes, identified as H. mediosora, and sporophytes of H. mediosora formed a clade and were distinct from related species of Haplopteris. The gametophytes were also growing independently because of the absence of sporophytes. A comparison of the haplotypes of the matK and trnL-F regions showed that the gametophytes had two chloroplast DNA haplotypes. The polymorphisms may have been derived from ancestral sporophytes that were present in Japan during the glacial period. Despite the rarity of sporophytes in the area, the independent gametophytes occur in four distant localities in the Oku-chichibu mountains.

著者

TAKAYA IWASAKI AKITAKA TONO KYOKO AOKI AKIHIRO SEO NORIAKI MURAKAMI

出版者

The Japanese Society for Plant Systematics

雑誌

Acta Phytotaxonomica et Geobotanica (ISSN:13467565)

巻号頁・発行日

vol.61, no.1, pp.1-20, 2010-06-30 (Released:2017-03-21)

参考文献数

35

被引用文献数

1

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A phylogeographic study of two species of Carpinus, C. japonica Blume and C. tschonoskii Maxim. (Betulaceae), based on the distribution patterns of their chloroplast DNA haplotypes, is reported. In Japan, these species are mainly distributed in Pacific-type deciduous broad-leaved forests. Using 439-440 and 627-629bp nucleotide sequences of noncoding regions of chloroplast DNA, we detected 5 and 6 haplotypes among 217 and 181 individuals sampled from 52 and 49 populations of C. japonica and C. tschonoskii, respectively. The geographic distribution patterns of the haplotypes were highly structured. We investigated the common phylogeographic patterns between the two species that would indicate the influence of common historical factors such as climate change since the last glacial maximum (LGM). Based on our results, we concluded that the Pacific-type Japanese deciduous broad-leaved forests were split into at least three refugia during the LGM. After the LGM, the species expanded to northern areas or moved to higher altitudes from each refugium, thus now occupying northeastern, central, and southwestern Japan.