Details of the Researcher

PHOTO

Takuro Ito
Section
The Center for Academic Resources and Archives
Job title
Assistant Professor
Degree

  • 博士（学術）（東京農工大学）

  • 修士（農学）（茨城大学）

Research History 3

  • 2020/05 - Present
    Tohoku University　The Center for Academic Resources and Archives

  • 2018/04 - 2020/05
    Kyoto University　Graduate School of Agriculture

  • 2016/04 - 2018/03
    Tokyo University of Agriculture and Technology　United Graduate School of Agricultural Science

Education 3

  • Tokyo University of Agriculture and Technology　United Graduate School of Agricultural Science　Department of Biological Production Science

    2015/04 - 2018/03

  • Ibaraki University　Graduate School of Agriculture

    2013/04 - 2015/03

  • Ibaraki University　College of Agriculture

    2009/04 - 2013/03

Committee Memberships 5

  • Phytokeys　Subject Editor

    2024/11 - Present

  • Journal of Plant Research Editorial Board Member

    2024/01 - Present

  • 青森県環境影響評価審議会委員

    2022/04 - Present

  • 日本植物学会　広報委員

    2021/03 - 2023/03

  • 日本植物分類学会　第23回大会実行委員長

    2024/03 -

Professional Memberships 3

  • THE ECOLOGICAL SOCIETY OF JAPAN

  • THE BOTANICAL SOCIETY OF JAPAN

  • JAPANESE SOCIETY FOR PLANT SYSTEMATICS

Research Interests 5

  • Sedum

  • Phylogeography

  • Crassulaceae

  • Adaptive evolution

  • Phylogenetic systematics

Research Areas 2

  • Life sciences / Evolutionary biology /

  • Life sciences / Biodiversity and systematics /

Awards 3

  1. 奨励賞

    2025/03　日本植物分類学会

  2. 第16回 日本植物分類学会大会発表賞 (口頭発表部門)

    2017/03　日本植物分類学会

  3. East Asian Plant Diversity and Conservation 2016 Best Poster Award

    2016/08　Taxonomy and Evolution Division, the Botanical Society of China・The Korean Society of Plant Taxonomist・The Japanese Society for Plant Systematics

Papers 41

  1. Ploidy Analysis of Two Lineages Within the Histiopteris incisa Complex in the Japanese Archipelago Peer-reviewed

    Wataru Shinohara, Ryutaro Koda, Katsuhiro Yoneoka, Kaoru Yamamoto, Takuro Ito, Noriaki Murakami

    American Fern Journal　115　(2)　2025/05/12

    Publisher: American Fern Society

    DOI： 10.1640/0002-8444-115.2.142 　

    ISSN： 0002-8444

  2. New Species of Thalictrum (Ranunculaceae) from Okinawa Island in Japan and Its Phylogenetic Implications Peer-reviewed

    KANAE MICHIMOTO, MASATSUGU YOKOTA, ATSUSHI ABE, SHINJI FUJII, DAIKI TAKAHASHI, SATOSHI KAKISHIMA, CHIH CHIEH YU, TAKURO ITO, MASAYUKI MAKI

    Phytotaxa　696　(1)　55-70　2025/03/28

    Publisher: Magnolia Press

    DOI： 10.11646/phytotaxa.696.1.3 　

    ISSN： 1179-3155

    eISSN： 1179-3163

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    This study aims to compare Thalictrum (Ranunculaceae) plant species, tentatively identified as T. minus, from the Yambaru region of Okinawa Island, Japan, with closely related species using morphometric and molecular phylogenetic analyses. Morphological observations revealed that the unique plants from Okinawa Island had clavate filaments and thickened roots. These traits differed significantly from those of typical T. minus, which have filamentous filaments and slender roots. Molecular phylogenetic analyses revealed that the unique plant on Okinawa Island is sister to T. urbaini, endemic to Taiwan, and formed a separate clade from those containing T. minus. Based on current morphological comparisons and molecular phylogenetic analyses, the unique plant on Okinawa Island was concluded to be a previously undescribed species, newly named Thalictrum yambaruense. Furthermore, our molecular phylogenetic analyses of Thalictrum in Japan and Taiwan revealed that T. tuberiferum var. yakusimense, endemic to Yakushima Island, Japan, is phylogenetically distinct from T. tuberiferum var. tuberiferum. Therefore, we propose elevating the taxonomic status of T. tuberiferum var. yakusimense to the species level as T. yakusimense.

  3. New record of Sedum mukojimense (Crassulaceae) on Chichi-jima Island, the Bonin Islands

    Ito, T., Goto, M., Inoue, M., Sato, S., Maki, M.

    Ogasawara research　51　57-69　2025/03

  4. Comparative genomic analysis has revealed the unique conservation value of a rare plant species Torenia concolor (Linderniaceae) growing on the edge of its distribution range Peer-reviewed

    Yuji Isagi, Shimizu Taiga, Kobayashi Yukihiro, Yoshihisa Suyama, Chinatsu Tokuhiro, Goro Kokubugata, Atsushi Abe, Takuro Ito, Takashi Makino, Michimasa Yamasaki

    Journal of Plant Research　2025

  5. Sedum diversiflorum sp. nov. (Crassulaceae), a new species with variable merosity from the Satsunan Islands, Kagoshima, Japan Peer-reviewed

    Takuro Ito, Masatsugu Yokota, Mizuho Endo, Akitoshi Iwamoto, Masayuki Maki, Goro Kokubugata

    Nordic Journal of Botany　2025

  6. Detection and validation of QTLs for flowering time in morning glory Peer-reviewed

    Hiroaki Katsuyama, Takuro Ito, Kyousuke Ezura, Emdadul Haque, Atsushi Hoshino, Eiji Nitasaka, Michiyuki Ono, Shusei Sato, Sachiko Isobe, Hiroyuki Fukuoka, Nobuyoshi Watanabe, Tsutomu Kuboyama

    Breeding Science　2025

  7. A New Species, Chrysosplenium brevifilamentosum (Saxifragaceae), from Kyushu, Japan Peer-reviewed

    Sugiyama, Y., Ito, T., Yamashiro, T., Fujii, S., Igari, M., Maki, M.

    Acta Phytotaxonomica et Geobotanica　2025

  8. Effects of soil and phylogeny on sulfur and phosphorus concentrations in wild plants on volcanic and non-volcanic soils in Japan Peer-reviewed

    Takafumi Mizuno, Daichi Kondo, Hiroto Kasai, Jun Yamashita, Takuro Ito, Yoshinori Murai, Antony van der Ent, Atsushi Hashimoto, Toshihiro Watanabe

    Soil Science and Plant Nutrition　1-11　2024/07/22

    Publisher: Informa UK Limited

    DOI： 10.1080/00380768.2024.2381636 　

    ISSN： 0038-0768

    eISSN： 1747-0765

  9. Phylogenetic relationships and divergence time of Hydrangea sect. Macrophyllae (Hydrangeaceae) revealed by genome-wide SNPs Peer-reviewed

    Shoki Murakami, Takuro Ito, Tatsuya Uemachi, Shinji Fujii, Ayumi Matsuo, Yoshihisa Suyama, Masayuki Maki

    Plant Systematics and Evolution　310　(4)　2024/07/04

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s00606-024-01902-5 　

    ISSN： 0378-2697

    eISSN： 1615-6110

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    Abstract Hydrangea sect. Macrophyllae comprises deciduous shrubs including two species with seven infraspecific taxa distributed throughout the Japanese Archipelago and adjacent areas. In this study, we revealed a phylogeny of Hydrangea sect. Macrophyllae by using a larger dataset of genome-wide SNPs than those employed in a previous study and by adding more comprehensive taxa/populations, which cover the entire distribution of the section. We then revised the taxonomic treatment of sect. Macrophyllae based on the higher-resolution phylogenetic trees obtained in this study. The phylogenetic trees estimated in this study showed five major clades, suggesting that H. serrata var. minamitanii and var. yesoensis should be treated as independent species from other H. serrata, that H. serrata var. australis and var. yakushimensis could be subclassified under the major clades and that var. angustata could be a synonym of var. serrata. The divergence time of these major clades was estimated to be in the Pleistocene.

  10. New Flavonoids from the leaves and stems of Sedum formosanum (Crassulaceae) Peer-reviewed

    Takayuki Mizuno, Takahisa Nakane, Hari Prasad Devkota, Takuro Ito, Goro Kokubugata, Tsukasa Iwashina

    Phytochemistry Letters　61　198-207　2024/06

    Publisher: Elsevier BV

    DOI： 10.1016/j.phytol.2024.05.003 　

    ISSN： 1874-3900

  11. Intraspecific divergence in a coastal plant, Euphorbia jolkinii, at a major biogeographic boundary in East Asia Peer-reviewed

    Hiroyuki Iwata, Takuro Ito, Jong‐Soo Park, Goro Kokubugata, Akihiro Kakezawa, Takahide Kurosawa, Akihiro Nishimura, Hiroshi Noda, Koji Takayama

    American Journal of Botany　111　(5)　2024/05/09

    Publisher: Wiley

    DOI： 10.1002/ajb2.16327 　

    ISSN： 0002-9122

    eISSN： 1537-2197

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    Abstract Premise Quaternary climatic fluctuations and long‐distance seed dispersal across the sea are critical factors affecting the distribution of coastal plants, but the spatiotemporal nature of population expansion and distribution change of East Asian coastal plants during this period are rarely examined. To explore this process, we investigated the genome‐wide phylogenetic patterns of Euphorbia jolkinii Boiss. (Euphorbiaceae), which grows widely on littoral areas of Japan, Korea, and Taiwan. Methods We used plastome sequences and genome‐wide single nucleotide polymorphisms in samples across the species range to reveal phylogeographic patterns and spatiotemporal distributional changes. We conducted ecological niche modeling for the present and the last glacial maximum (LGM). Results Genetic differentiation was observed between the northern and southern populations of E. jolkinii, separated by the major biogeographic boundary, the Tokara Gap. These two groups of populations differentiated during the glacial period and subsequently intermingled in the intermorainic areas of the central Ryukyu Islands after the LGM. Ecological niche models suggested that the potential range of E. jolkinii was restricted to southern Kyushu; however, it was widespread in the southern Ryukyu Islands and Taiwan during the LGM. Conclusions This study provides evidence of genetic differentiation among coastal plant populations separated by the prominent biogeographical boundary. Although coastal plants are typically expected to maintain population connectivity through sea‐drifted seed dispersal, our findings suggest that genetic differences may arise because of a combination of limited gene flow and changes in climate during the glacial period.

  12. Salvia guidongensis sp. nov.: unraveling a critical evolutionary link in East Asian Salvia from Central China integrating morphology, phylogeny, and plastid genomics Peer-reviewed

    Yan-Bo Huang, Zhe-Chen Qi, Jie-Ying Feng, Bin-Jie Ge, Cun-Zhong Huang, Yu-Qing Feng, Jing Wu, Pu-Rui Wei, Takuro Ito, Goro Kokubugata, Pan Li, Yu-Kun Wei

    Frontiers in Plant Science　15　2024/03/05

    Publisher: Frontiers Media SA

    DOI： 10.3389/fpls.2024.1332443 　

    eISSN： 1664-462X

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    Introduction Salvia L., representing the largest genus within the mint family, is noted for its global distribution of approximately 1000 species, with East Asia, and particularly China, recognized as a critical center of diversity for the genus. Methods Our research was conducted through extensive fieldwork in Guidong County, Hunan Province, China, where we identified a previously undescribed species of Salvia. The identification process involved detailed morphological observations, phylogenetic analyses, and plastid genomics. Results The newly discovered species, Salvia guidongensis, exhibits unique characteristics not commonly observed in the East Asian lineage of Salvia, including dual floral colors within natural populations—either pale purple or pale yellow. Morphologically, while it shares similarities with members of sect. Glutinaria, S. guidongensis is distinct in its floral morphology, stature, and specific foliar traits. Phylogenetic analysis places S. guidongensis in a unique clade within the East Asian lineage of Salvia, suggesting it may serve as an important evolutionary link. Additionally, we explored the plastome features of S. guidongensis, comparing them with those of closely related species. Discussion The discovery of S. guidongensis not only entriches the taxonomic tapestry of Salvia but also provides critical insights into the biogeography and evolutionary pathways of the genus in East Asia. By integrating morphological and molecular data, we validate the novel status of S. guidongensis and highlight its significance in bridging taxonomic and evolutionary gaps within Sect. Glutinaria of Salvia.

  13. Double migration of the endangered Tricyrtis formosana (Liliaceae) in Japan Peer-reviewed

    Kaori Tsunenari, Takuro Ito, Masatsugu Yokota, Mayu Shibabayashi, Chiharu Endo, Kuo-Fang Chung, Yoshihisa Suyama, Ayumi Matsuo, Atsushi Abe, Akiyo Naiki, Hiroaki Setoguchi, Takashi Makino, Yuji Isagi

    Scientific Reports　14　(1)　2024/01/10

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41598-024-51431-x 　

    eISSN： 2045-2322

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    Abstract The Ryukyu Islands of Japan are a biodiversity hotspot due to geographical and historical factors. Tricyrtis formosana is a perennial herbaceous plant that commonly found in Taiwan. But only a few populations have been identified in a limited habitat on Iriomote Island, while populations of unknown origin occur near human settlements in an area on the main island of Okinawa. To better understand these populations of the phylogenetic uniqueness and intrinsic vulnerability, we conducted comparative analyses including (1) phylogeny and population structure with MIG-seq data, (2) photosynthesis-related traits of plants grown under common conditions and (3) transcriptome analysis to detect deleterious variations. Results revealed that T. formosana was split into two clades by the congeners and that Iriomote and Okinawa populations independently derived from ancestral Taiwanese populations in each clade. Photosynthetic efficiency was lowest in the Iriomote population, followed by Okinawa and Taiwan. Transcriptome analysis showed that the Iriomote population accumulated more deleterious variations, suggesting intrinsic vulnerability. These results indicate that each T. formosana population in Japan is phylogenetically unique and has been independently dispersed from Taiwan, and that the Iriomote population presents a high conservation difficulty with a unique photosynthesis-related characteristic and a larger amount of deleterious variations.

  14. Development and characterization of expressed sequence tag-simple sequence repeat markers for Anaphalis margaritacea var. yedoensis (Asteraceae) Peer-reviewed

    Taishi Hoson, Shoki Murakami, Takuro Ito, Masuyuki Maki

    Genes & Genetic Systems　98　(5)　259-265　2023/10/01

    Publisher: Genetics Society of Japan

    DOI： 10.1266/ggs.23-00037 　

    ISSN： 1341-7568

    eISSN： 1880-5779

  15. A new record of Ardisia×walkeri, a hybrid of A. japonica and A. pusilla, (Primulaceae) from Jeju Island, Korea Peer-reviewed

    Takuro Ito

    Journal of Species Research　12　(3)　258-265　2023/08/31

    DOI： 10.12651/JSR.2023.12.3.258 　

  16. Phylogenetic Background and Taxonomic Status of Crepidiastrum lanceolatum (Asteraceae) Sold as a Traditional Vegetable in Okinawa Prefecture, Japan Revealed by MIG-seq SNP Data Peer-reviewed

    Takuro Ito

    Bulletin of the National Museum of Nature and Science, Series B　49　(2)　73-82　2023/05

  17. Plastome-based backbone phylogeny of East Asian Phedimus (Subgenus Aizoon: Crassulaceae), with special emphasis on Korean endemics Peer-reviewed

    Yongsung Kim, Seon-Hee Kim, JiYoung Yang, Myong-Suk Cho, Marina Koldaeva, Takuro Ito, Masayuki Maki, Seung-Chul Kim

    Frontiers in Plant Science　14　2023/03/14

    Publisher: Frontiers Media SA

    DOI： 10.3389/fpls.2023.1089165 　

    eISSN： 1664-462X

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    Although the monophyly of Phedimus has been strongly demonstrated, the species relationships among approximately 20 species of Phedimus have been difficult to determine because of the uniformity of their floral characteristics and extreme variation of their vegetative characters, often accompanied by high polyploid and aneuploid series and diverse habitats. In this study, we assembled 15 complete chloroplast genomes of Phedimus species from East Asia and generated a plastome-based backbone phylogeny of the subgenus Aizoon. As a proxy for nuclear phylogeny, we reconstructed the nuclear ribosomal DNA internal transcribed spacer (nrDNA ITS) phylogeny independently. The 15 plastomes of subg. Aizoon were highly conserved in structure and organization; hence, the complete plastome phylogeny fully resolved the species relationships with strong support. We found that P. aizoon and P. kamtschaticus were polyphyletic and morphologically distinct or ambiguous species, and they most likely evolved from the two species complex. The crown age of subg. Aizoon was estimated to be 27 Ma, suggesting its origin to be in the late Oligocene; however, the major lineages were diversified during the Miocene. The two Korean endemics, P. takesimensis and P. zokuriensis, were inferred to have originated recently during the Pleistocene, whereas the other endemic, P. latiovalifolium, originated in the late Miocene. Several mutation hotspots and seven positively selected chloroplast genes were identified in the subg. Aizoon.

  18. A new species of succulent plant discovered in limestone areas of Kyushu, Japan: Sedum kawaraense（Crassulaceae） Peer-reviewed

    Takuro Ito, Hironobu Kanemistu, Taishi Hoson, Tetsukazu Yahara

    Phytotaxa　587　((2))　149-160　2023/03

    Publisher: Magnolia Press

    DOI： 10.11646/phytotaxa.587.2.4 　

    ISSN： 1179-3155

    eISSN： 1179-3163

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    An unknown species of the genus Sedum was discovered in Kawara-dake and Ryu-ga-hana, limestone mountains in Kyushu, Japan. The present study aimed to clarify the taxonomic status of the unknown Sedum species through morphological and ecological comparisons and molecular phylogenetic analysis using ITS sequences based on comprehensive taxon sampling of sect. Sedum in East Asia. Morphologically and ecologically, the unknown species was most similar to S. lipingense in China, but was distinguished by having larger spatulate rosulate leaves and more flowers per flowering stem. Phylogenetically, it belonged to a clade with four Chinese endemics including S. lipingense and two other species widely distributed in East Asia. The clade showed polytomy at the base, but the unknown species was genetically differentiated from the other species. Therefore, we describe the unknown species from Kawara-dake as a new species, S. kawaraense.

  19. The contrary conservation situations of two local critically endangered species, Vaccinium emarginatum (Ericaceae) and Elatostema platyphyllum (Urticaceae), growing on the eastern edge of the distribution Peer-reviewed

    Mayu Shibabayashi, Taiga Shimizu, Chinatsu Tokuhiro, Yoshihisa Suyama, Shota Sakaguchi, Takuro Ito, Chih-Chieh Yu, Kuo-Fang Chung, Jun’ichi Nagasawa, Toshiaki Shiuchi, Goro Kokubugata, Atsushi Abe, Akiyo Naiki, Atsushi J. Nagano, Yuji Isagi

    Frontiers in Ecology and Evolution　11　2023/01/26

    DOI： 10.3389/fevo.2023.1093321 　

    ISSN： 2296-701X

    eISSN： 2296-701X

  20. Sedum ryukyuense, a Replacement Name for Sedum uniflorum (Crassulaceae) Peer-reviewed

    Takuro ITO

    The Journal of Japanese Botany　97　(4)　207-211　2022/08/20

    DOI： 10.51033/jjapbot.97_4_11180 　

    ISSN： 0022-2062 2436-6730

  21. The complete chloroplast genome sequence of Thalictrum aquilegiifolium var. sibiricum (Ranunculaceae) Peer-reviewed

    Kanae Michimoto, Takuro Ito, Masayuki Maki

    Mitochondrial DNA Part B　7　(6)　1171-1173　2022/06/03

    Publisher: Informa UK Limited

    DOI： 10.1080/23802359.2022.2088309 　

    ISSN： 2380-2359

    eISSN： 2380-2359

  22. The complete chloroplast genome of a coastal plant, Euphorbia jolkinii (Euphorbiaceae) Peer-reviewed

    Hiroyuki Iwata, Takuro Ito, Goro Kokubugata, Koji Takayama

    Mitochondrial DNA Part B　7　(3)　569-570　2022/03/04

    Publisher: Informa {UK} Limited

    DOI： 10.1080/23802359.2022.2055502 　

    eISSN： 2380-2359

  23. The complete chloroplast genome sequence of Anaphalis margaritacea var. yedoensis (Asteraceae) and phylogenetic relationships within Gnaphalieae Peer-reviewed

    Taishi Hoson, Takuro Ito, Masayuki Maki

    Mitochondrial DNA Part B　7　(3)　563-565　2022/03/04

    Publisher: Informa {UK} Limited

    DOI： 10.1080/23802359.2022.2048213 　

  24. Plastome phylogenomics of Allaeanthus, Broussonetia and Malaisia (Dorstenieae, Moraceae) and the origin of B. × kazinoki Peer-reviewed

    Wen-Hsi Kuo, Shih-Hui Liu, Chiung-Chih Chang, Chia-Lun Hsieh, Yi-Hsuan Li, Takuro Ito, Hyosig Won, Goro Kokubugata, Kuo-Fang Chung

    Journal of Plant Research　2022/03

    DOI： 10.1007/s10265-022-01369-w 　

  25. Development of microsatellite markers for Meliosma arnottiana (Sabiaceae) disjunctively distributed in the Japanese archipelago Peer-reviewed

    Shoki Murakami, Takuro Ito, Akira Asakawa, Shinji Fujii, Masayuki Maki

    Journal of Forest Research　1-4　2021/06/22

    Publisher: Informa UK Limited

    DOI： 10.1080/13416979.2021.1941561 　

    ISSN： 1341-6979

    eISSN： 1610-7403

  26. Refugia during the last glacial period and the origin of the disjunct distribution of an insular plant Peer-reviewed

    Takayuki Yamada, Goro Kokubugata, Shinji Fujii, Chien‐Fan Chen, Akira Asakawa, Takuro Ito, Masayuki Maki

    Journal of Biogeography　48　(6)　1460-1474　2021/06

    Publisher: Wiley

    DOI： 10.1111/jbi.14090 　

    ISSN： 0305-0270

    eISSN： 1365-2699

  27. Niche conservatism promotes speciation in cycads: the case ofDioon merolae(Zamiaceae) in Mexico Peer-reviewed

    José Said Gutiérrez‐Ortega, María Magdalena Salinas‐Rodríguez, Takuro Ito, Miguel Angel Pérez‐Farrera, Andrew P. Vovides, José F. Martínez, Francisco Molina‐Freaner, Antonio Hernández‐López, Lina Kawaguchi, Atsushi J. Nagano, Tadashi Kajita, Yasuyuki Watano, Takashi Tsuchimatsu, Yuma Takahashi, Masashi Murakami

    New Phytologist　227　(6)　1872-1884　2020/09

    DOI： 10.1111/nph.16647 　

    ISSN： 0028-646X

    eISSN： 1469-8137

  28. Radiation history of Asian Asarum (sect. Heterotropa, Aristolochiaceae) resolved using a phylogenomic approach based on double-digested RAD-seq data Peer-reviewed

    Yudai Okuyama, Nana Goto, Atsushi J Nagano, Masaki Yasugi, Goro Kokubugata, Hiroshi Kudoh, Zhechen Qi, Takuro Ito, Satoshi Kakishima, Takashi Sugawara

    Annals of Botany　126　(2)　245-260　2020/07/24

    DOI： 10.1093/aob/mcaa072 　

    ISSN： 0305-7364

    eISSN： 1095-8290

  29. A new species of succulent plants from the Muko-jima group of the Bonin Islands, Japan: Sedum mukojimense (Crassulaceae) Peer-reviewed

    TAKURO ITO, MASAFUMI GOTO, HIDETO NAKANO, GORO KOKUBUGATA

    Phytotaxa　450　(2)　188-198　2020/06/25

    Publisher: Magnolia Press

    DOI： 10.11646/phytotaxa.450.2.4 　

    ISSN： 1179-3155

    eISSN： 1179-3163

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    A taxonomic re-examination of Sedum boninense, which is endemic to the Muko-jima and Chichi-jima groups of the Bonin Islands, Japan, was carried out. Morphological and physiological comparisons revealed differences between plants from the Muko-jima and Chichi-jima groups in the shape and size of leaves and underground bulb scale leaves, plant habit, habitat and flowering season. Molecular phylogenetic analysis using the ITS region revealed that the plants from respective island groups formed sister clades. Therefore, the plant from Muko-jima group is described as a new species of S. mukojimense.

  30. Sedum formosanum subsp. miyakojimense (Crassulaceae), a new subspecies from Miyako-jima Island of the Ryukyu Islands, Japan. Peer-reviewed

    Takuro Ito, Chih-Chieh Yu, Masatsugu Yokota, Goro Kokubugata

    Phytokeys　148　51-70　2020

    Publisher: Pensoft Publishers

    DOI： 10.3897/phytokeys.148.48957 　

    ISSN： 1314-2011

    eISSN： 1314-2003

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    We re-examined the taxonomic status of plants treated as Sedum formosanum (Crassulaceae) from Miyako-jima Island of the Ryukyu Islands, Japan, using morphological comparison and molecular phylogenetic analyses with related species. In morphology, plants from Miyako-jima Island bore a close resemblance to the other plants of S. formosanum, but differed in being perennial, polycarpic, and having lateral axillary branches. Molecular analyses based on ITS of nrDNA and six regions of cpDNA sequencing indicated that the Miyako-jima plants formed a distinct subclade. This subclade was part of a polytomy with three other subclades comprising nine taxa endemic to Taiwan and S. formosanum from other areas, including the type locality. Therefore, we propose and describe the Miyako-jima plants as a new subspecies, Sedum formosanum subsp. miyakojimense.

  31. Three Independent Migrations of Dodonaea viscosa (Sapindaceae) to Japan Archipelago Revealed by Molecular Data Peer-reviewed

    Takuro Ito

    Bulletin of the National Museum of Nature and Science, Series B　45　(4)　137-145　2019/11

  32. A specialized deceptive pollination system based on elaborate mushroom mimicry

    Satoshi Kakishima, Nobuko Tuno, Kentaro Hosaka, Tomoko Okamoto, Takuro Ito, Yudai Okuyama

    2019/10/25

    Publisher: Cold Spring Harbor Laboratory

    DOI： 10.1101/819136 　

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    Abstract Despite its potential effectiveness for outcrossing, few examples of pollination via mushroom mimicry have been reported. This may be because the conditions under which the strategy can evolve are limited and/or because demonstrating it is challenging. Arisaema is a plant genus that has been suggested to adopt mushroom mimicry for pollination, although no compelling evidence for this has yet been demonstrated. Here, we report that Arisaema sikokianum utilizes mostly a single genus of obligate mycophagous flies (Mycodrosophila) as pollinators, and that the insect community dominated by Mycodrosophila is strikingly similar to those found on some species of wood-decaying fungi. Comparative chemical analyses of Arisaema spp. and various mushrooms further revealed that only A. sikokianum emits a set of volatile compounds shared with some mushroom species utilized by Mycodrosophila. Meanwhile, other closely related and often sympatric Arisaema species do not possess such typical traits of mushroom mimicry or attract Mycodrosophila, thereby likely achieving substantial reproductive isolation from A. sikokianum. Our finding indicates that mushroom mimicry is an exceptional and derived state in the genus Arisaema, thus providing an unprecedented opportunity to study the mechanisms underlying the coordinated acquisition of mimicry traits that occurred during a recent speciation event.

  33. Evolutionary origin of a periodical mass-flowering plant. International-journal Peer-reviewed

    Satoshi Kakishima, Yi-Shuo Liang, Takuro Ito, Tsung-Yu Aleck Yang, Pei-Luen Lu, Yudai Okuyama, Mitsuyasu Hasebe, Jin Murata, Jin Yoshimura

    Ecology and evolution　9　(8)　4373-4381　2019/04

    DOI： 10.1002/ece3.4881 　

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    The evolutionary origin of periodical mass-flowering plants (shortly periodical plants), exhibiting periodical mass flowering and death immediately after flowering, has not been demonstrated. Within the genus Strobilanthes (Acanthaceae), which includes more than 50 periodical species, Strobilanthes flexicaulis on Okinawa Island, Japan, flowers gregariously every 6 years. We investigated the life history of S. flexicaulis in other regions and that of closely related species together with their molecular phylogeny to reveal the evolutionary origin of periodical mass flowering. S. flexicaulis on Taiwan Island was found to be a polycarpic perennial with no mass flowering and, in the Yaeyama Islands, Japan, a monocarpic perennial with no mass flowering. Molecular phylogenetic analyses indicated that a polycarpic perennial was the ancestral state in this whole group including S. flexicaulis and the closely related species. No distinctive genetic differentiation was found in S. flexicaulis among all three life histories (polycarpic perennial, monocarpic perennial, and periodical plant). These results suggest that among S. flexicaulis, the periodical mass flowering on Okinawa Island had evolved from the polycarpic perennial on Taiwan Island via the monocarpic perennial in the Yaeyama Islands. Thus, the evolution of life histories could have taken at the level of local populations within a species.

  34. Reconsiderations of distribution and taxonomic status of inflaspecific taxa in Sedum japonicum (Crassulaceae) based on morphological and molecular data Peer-reviewed

    Takuro Ito

    Bulletin of the National Museum of Nature and Science, Series B　44　(2)　1-11　2018/08

  35. Unique parallel radiations of high-mountainous species of the genus Sedum (Crassulaceae) on the continental island of Taiwan Peer-reviewed

    Takuro Ito, Chih-Chieh Yu, Koh Nakamura, Kuo-Fang Chung, Qin-er Yang, Cheng-Xin Fu, Zhe-Chen Qi, Goro Kokubugata

    Molecular Phylogenetics and Evolution　113　9-22　2017/08

    DOI： 10.1016/j.ympev.2017.03.028 　

    ISSN： 1055-7903

    eISSN： 1095-9513

  36. Sedum danjoense (Crassulaceae), a new species of succulent plants from the Danjo Islands in Japan Peer-reviewed

    Takuro Ito, Hiroki Nakanishi, Yoshiro Chichibu, Kiyotaka Minoda, Goro Kokubugata

    Phytotaxa　309　(1)　23-34　2017/06

    DOI： 10.11646/phytotaxa.309.1.2 　

    ISSN： 1179-3155

    eISSN： 1179-3163

  37. Confirmation of the occurrence of Portulaca okinawensis var. amamiensis (Portulacaceae) in Kakeroma Island of the Ryukyu archipelago, Japan. Peer-reviewed

    Goro Kokubugata, Takuro Ito, Masastugu Yokota

    Bulletin of the National Museum of Nature and Science, Series B　42　(2)　67-71　2016

    Publisher: National Museum of Nature and Science

    ISSN： 1881-9060

  38. Taxonomic reconsideration of Celtis biondii var. insularis in the Miyako Island Group of the Ryukyus based on morphological and molecular data. Peer-reviewed

    The Journal of Phytogeography and Taxonomy　63　(1)　67-75　2016

    Publisher:

    ISSN： 0388-6212

  39. Taxonomic reexamination of Portulaca boninensis (Portulacaceae) in the Bonin (Ogasawara) Islands of Japan using molecular and morphological data Peer-reviewed

    Goro Kokubugata, Hidetoshi Kato, Duilio Iamonico, Hana Umemoto, Takuro Ito, Koh Nakamura, Noriaki Murakami, Masatsugu Yokota

    Phytotaxa　217　(3)　279-287　2015/06

    DOI： 10.11646/phytotaxa.217.3.5 　

    ISSN： 1179-3155

    eISSN： 1179-3163

  40. Nuclear and plastid DNA data confirm that Sedum tosaense (Crassulaceae) has a disjunct distribution between Pacific mainland Japan and Jeju Island, Korea Peer-reviewed

    Takuro Ito, Koh Nakamura, Chan-Ho Park, Gwan-Pil Song, Ayako Maeda, Yuki Tanabe, Goro Kokubugata

    Phytotaxa　177　(4)　221-230　2014/09

    DOI： 10.11646/phytotaxa.177.4.3 　

    ISSN： 1179-3155

    eISSN： 1179-3163

  41. Taxonomic reexamination of Sedum formosanum (Crassulaceae) in Japan, Taiwan, and the Philippines based on molecular data. Peer-reviewed

    The Journal of Phytogeography and Taxonomy　62　(1)　1-9　2014

    Publisher:

    ISSN： 0388-6212

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Misc. 3

  1. 邦産ビャクシン属ネズミサシ節における網羅的分子系統地理解析

    田口裕哉, 高橋大樹, 伊東拓朗, 田金秀一郎, 菅原崚太, 菅原崚太, 小栗恵美子, 阿部晴恵, 陶山佳久

    日本植物分類学会大会研究発表要旨集　23rd　2024

  2. マンネングサ属（ベンケイソウ科）の特異な生き様に着目した植物進化研究

    伊東拓朗

    植物地理・分類研究　67　(2)　117-125　2019

  3. 男女群島固有の新種ダンジョマンネングサについて

    中西弘樹, 伊東拓朗

    長崎県生物学会誌　(82)　4‐5　2018/06/30

    ISSN： 0387-4249

Research Projects 14

  1. Tracing of distribution establishment and clarification for environment adaptation of plants occurring at Ryukyu lowlands and Taiwan highlands

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: National Museum of Nature and Science, Tokyo

    2024/04 - 2028/03

  2. 日露中韓共通の絶滅危惧植物の適応可能性を最大化する，東北アジアスケール保全単位

    中村 剛, 國府方 吾郎, 福田 知子, 村井 良徳, 伊東 拓朗

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 北海道大学

    2024/04 - 2028/03

  3. 植物特性評価に基づいてブリトゥン島の荒野林を効果・効率的に保全する

    國府方 吾郎

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 国際共同研究加速基金(海外連携研究)

    Institution: 独立行政法人国立科学博物館

    2023/09 - 2028/03

  4. 大規模撹乱と野生植物集団の遺伝的多様性：巨大津波を想定した前向き・後ろ向き研究

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2022/04 - 2025/03

  5. マンネングサ属種群における異質倍数体形成がもたらす環境適応メカニズムの検証

    伊東 拓朗

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 若手研究

    Category: 若手研究

    Institution: 東北大学

    2022/04 - 2025/03

  6. Comprehensive evaluation of germinabilities of seeds of herbarium specimens based on multi storage facilities and exhaustive taxon sampling.

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Niigata University

    2021/04/01 - 2024/03/31

  7. 琉球列島の荒野林に産する植物の現状把握に基づく保全指針の提示

    國府方 吾郎, 伊東 拓朗

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(C)

    Category: 基盤研究(C)

    Institution: 独立行政法人国立科学博物館

    2021/04/01 - 2024/03/31

    More details Close

    沖縄島における荒野林の現状調査を行ったところ、島中部に存在していた荒野林が土地開発によって消滅していることが判明した。その情報を関係機関と共有するとともに、沖縄島の残された荒野林の保全を強化する必要があることを提言した。また、琉球固有で従来から個体数が少ないリュウキュウヒメハギは、これまでよりも個体数が激減していることから、その減少要因を特定し、種レベルでの保全を更に強化する必要があることが示唆された。 久米島において、自然の荒野林と1990年代の人為的伐採によってつくられた裸地における植物調査を行ったところ、後者には前者に特産する種が少ないことが示された。また、前者にはほとんど生育しない帰化種であるセンダグザ属が後者で多く認められた。これらの結果より、自然の荒野林と人工的な裸地との環境・栽培比較調査を行い、帰化種の出現に影響する要因を特定する必要があることが示唆された。荒野林に産する複数種において、自生地外保全のための栽培実験を行ったところ、タヌキアヤメなどはある程度の土壌保湿が必要であることが示され、荒野林に産する各種で最適な栽培環境がやや異なることが示された。 シンチクヒメハギについて台湾産を含めた解析したところ、南方から琉球列島への進入が示唆された。また、荒野林と常緑広葉樹林で著しい葉形態変異を示すギーマについて、先行調査によって琉球列島の主要な島から採集したサンプルをもとに次世代シーケンサーを用いて解析を行ったところ、各荒野林で認められる葉矮小化は独立して起こっている可能性が示唆された。更に、オオマツバシバの琉球列島内における集団間の遺伝的固有性・多様性を解析するため、小笠原固有のマツバシバおよび台湾・中国に産するタイワンマツバシバを国内外協力者から提供してもらい、今後の解析に備えた。

  8. 気候帯を超えて分布する植物種の周縁的種分化プロセスの検証

    伊東 拓朗

    Offer Organization: 市村清新技術財団

    System: 植物研究助成

    2022/04 - 2024/03

  9. 消滅の危機にあるブリトゥン島の荒野林における植物保全に関する緊急研究

    國府方吾郎

    Offer Organization: 日本学術振興会

    System: 二国間交流事業

    2020/04 - 2023/03

  10. Oceanic island evolution in genus Sedum with specialized oceanic current dispersal ability Competitive

    Ito Takuro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Early-Career Scientists

    2019/04/01 - 2022/03/31

    More details Close

    It is well known that plant species on oceanic islands undergo an habitat shift from coastal to montane habitats, associated with a loss of the ability of long-distance dispersal (LDD) of "seeds and fruits". Since the montane species Sedum boninense, endemic to the Bonin Islands, is sister to the coastal species S. uniflorum from the Ryukyu Archipelago and there is a coastal population on the Muko-jima Islands, I examined the evolutionary process of this species group as a model for the oceanic island evolution. The results showed that the Muko-jima Island pop. was a new species "Sedum mukojimense". In the past, S. uniflorum reached the Bonin Islands through the dispersal of "bulbs" by ocean currents, and S. mukojimense is thought to have speciated after secondary contact between S. boninense and S. uniflorum. Sedum boninense lost its LDD ability in the process of shifting to a montane habitat, and therefore underwent oceanic island evolution with both generality and uniqueness.

  11. 台湾産マンネングサ属の平行適応放散をモデルにした網羅的な適応進化プロセスの検証 Competitive

    伊東 拓朗

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    2018/04/25 - 2021/03/31

    More details Close

    ベンケイソウ科マンネングサ属は東アジア地域を一つの多様性の中心に持ち，中でも大陸島台湾の高地環境おいて，劇的に異なる光・水分環境に進出し，種多様化を遂げている．これまでの申請者の研究から，台湾固有のマンネングサ属種は2系統存在し，各系統で異なる光・水分環境に生育する種が急速に進化し，かつ2系統で独立して類似生態シフトと適応形質（葉形態及び光合成特性）を獲得した急速な種多様化（平行適応放散）を遂げていたことが明らかになっている．しかしながらその種分化や適応放散プロセスの解明には至っていないため，本研究では当該種群をモデルとした，網羅的な環境-形態-生理-ゲノムデータに基づく非生物環境への適応放散/進化メカニズムの解明を目的として研究を進めている． 今年度は台湾の現地に設置済みの温度，湿度，照度計から環境データの収集を行う予定であったが，新型コロナウイルスの影響により海外渡航がかなわず，現地調査ができなかった．また不足していた集団解析用植物サンプルの調達もできなかったため，一部研究計画に支障がでてしまった．ゲノム解析について，追加で4種のゲノムリシーケンスを行い，昨年度の計画と併せて台湾産マンネングサ属全14種のリシーケンスデータを取得した．全14種について，別途葉緑体前ゲノムの構築を完了した．さらに１種について第三世代シーケンサーを用いたロングリード配列の取得を行い，ショートリードのリシーケンスデータを組み合わせてリファレンスゲノムの構築を行った．構築したドラフトゲノムを基に，リシーケンスデータを使用して集団動態解析を行い，不完全なデータではあるものの利用できる環境データおよび形態データを用いてその関連を検証している．

  12. 多様な光合成様式がマンネングサ属の種多様化をもたらしたことを検証する Competitive

    伊東 拓朗

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 東京農工大学

    2016/04/22 - 2018/03/31

    More details Close

    ベンケイソウ科マンネングサ属は東アジア地域を一つの多様性の中心に持つ。中でも亜熱帯・熱帯域に位置し、発達した高山を有する大陸島台湾は著しく同属種の固有種率が高く、特に高地環境の異なる光・水分環境に生育し、種分化を遂げている。本研究課題ではこれらの種多様化の要因を探るため、分子系統解析を用いた詳細な種間関係の推定と、多様な光合成様式をもつ本属の特徴に着目した適応形質の探索、それに関連する遺伝子群を検出・配列比較を行った。 核・葉緑体複数領域に基づく東アジア産同属種の系統解析の結果、台湾固有種は2系統からなり、それぞれ類似したニッチシフトと急速な種多様化を遂げていた。さらにRAD-seqを用いた配列比較の結果、より明瞭に種間の関係性を認識できた。分岐年代推定の結果、2系統の急速な種多様化は、特に高地性の種でほぼ同時期の約80万年前に開始しており、山脈形成に伴う爆発的な種多様化の成立を示唆した。祖先形質復元の結果、各系統はそれぞれ中国東部と日本の系統が独立的に移入したことを示唆した。 適応形質の探索のため、安定炭素同位体比解析を用いて光合成特性の評価を行った結果、明乾燥環境種はweak CAM型、暗湿潤環境種はC3型光合成を駆動している可能性があり、光合成特性と環境の関連が示唆された。葉形態比較では、異なる環境に生育する種間で、乾燥ストレスや光合成効率の点から各環境に適応的な葉断面構造などの葉形態を持つことが明らかになった。適応形質に関連した遺伝子群の探索については、現在データ解析を行っており、一定の結果を得ている。 以上より、台湾産マンネングサ属種は2つの系統が独立的に急速な種多様化をとげ、湿度や光環境に対して適応的な光合成特性や葉形態を獲得した特殊な平行適応放散が起きたと考えられる。またその成立には高山を有する大陸島という台湾の環境特性が深く関与していると考えられる。

  13. 特殊な光合成様式をもつマンネングサ(Sedum) 属における適応遺伝子の探索 Competitive

    伊東 拓朗

    Offer Organization: 日本科学協会

    System: 笹川研究助成学術研究部門

    2015/04 - 2016/03

  14. 台湾と日本に分布している絶滅危惧植物の分類問題を検証する Competitive

    伊東 拓朗

    Offer Organization: 公益財団法人交流協会

    System: 若手研究者交流事業（台湾）

    2014/07 - 2014/08

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Teaching Experience 10

  1. 短期プロジェクト: 生態と進化（東北大学）

  2. 生態学実習（東北大学）

  3. 生物学演習I（東北大学）

  4. 先端生態発生適応科学特論Ⅲ（東北大学）

  5. 分子・細胞生物学特選科目（東北大学）

  6. 博物館実習（東北大学）

  7. 進化学実習（東北大学）

  8. 植物系統分類学実習（東北大学）

  9. 自然科学総合実験（東北大学）

  10. 基礎ゼミ（東北大学）

Show all Show first 5