2020 - 2024 Scientific utilization of plant specimens collected by Herbarium Hajacawa and verification of sampling activities by plant hunters
2017 - 2020 Molecular phylogeny and systematics of Leptopetalum (Rubiaceae) with special reference to evolution of shrubby species in oceanic island
2015 - 2018 Approach to adaptive and phylogenetic evolution of Aucuba from genome information
2011 - 2015 Systematic analyses for the Pan-Himalayan flora based on genetical and species diversities
2010 - 2012 Evolution of sexual systems in Gynochthodes umbellata and its allies (Rubiaceae)
2008 - 2010 Analysis of unidirectional hybridization between supra-annual flowering species, Strobilanthes glandulifera, and annual flowering species, S.tashiroi
2008 - 2010 Speciation and taxonomy of the endemic family Aucubaceae in Sino-Japanese floristic region
2005 - 2008 Plant diversity in the South Himalayan Region as the west end of the Sino-Japanese floristic region
2006 - 2007 アオキ種内の2倍体集団と4倍体集団における遺伝子交流
2005 - 2007 Phylogeographical analysis on the Arisaema ovate group, a circum. Japan Sea element
2001 - 2004 Floristic diversity in southern Himalayan region
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Papers (73)：
Akiyo Naiki, Tadaki Nakasone, Tetsuo Ohi-Toma, Koji Yonekura, Atsushi Abe. Rediscovery of Exallage auricularia (Rubiaceae) from Yonaguni Island, Okinawa, Japan. Journal of Japanese Botany. 2023. 98. 3. 134-139
Ohi-Toma T, Tanaka N, Naiki A. Lectotypification of Gardneria multiflora (Loganiaceae). Journal of Japanese Botany. 2023. 98. 2. 77-81
Tanaka N, Ohi-Toma T, Suksathan P, Aung M.M, Paulsen A.D, Mohamad S, Armstrong K.E. Myanmaranthus roseiflorus, a new genus and species of Marantaceae from Myanmar. Journal of Japanese Botany. 2022. 97. 4. 187-196
Xia M, Cai M, Comes H.P, Zheng L, Ohi-Toma T, Lee J, Qi Z, Konowalik K, Li P, Cameron K.M, et al. An overlooked dispersal route of Cardueae (Asteraceae) from the Mediterranean to East Asia revealed by phylogenomic and biogeographic analyses of Atractylodes. Annales of Botany. 2022. 130. 1. 53-64
Ito Y, Yadav S.R, Chang Y.S, Tagane S, Li P, Ohi-Toma T. Molecular species delimitation reveals underestimated diversity in the tree genus Nothapodytes (Icacinaceae). Plant Systematics and Evolution. 2022. 308
2000 - 2003 The University of Tokyo Graduate School of Science Department of Biological Sciences
1998 - 2000 Tokyo Metropolitan University
Work history (12)：
2019/04 - 現在 Okayama University of Science Nature Fieldwork Center Associate Professor
2023/04 - 2023/06 岡山大学 工学部 非常勤講師
2022/04 - 2022/06 Okayama University Faculty of Engineering
2021/10 - 2021/11 Okayama University Faculty of Environmental Science and Technology
2020/10 - 2020/11 Okayama University Faculty of Environmental Science and Technology
2013/09 - 2019/03 早稲田大学教育学部 非常勤講師(各年度・秋学期)
2007/04 - 2019/03 東京大学 大学院理学系研究科 助教
2007/04 - 2019/03 The University of Tokyo Graduate School of Science
2018/06 - 2018/07 首都大学東京 非常勤講師
2017/04 - 2017/09 放送大学 非常勤講師
2007/07 - 2007/07 玉川大学 非常勤講師
2004/01 - 2007/03 The University of Tokyo Graduate School of Science
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Committee career (5)：
2019/04 - 現在 自然フィールドワークセンター研究報告編集委員会
2018/03 - 現在 植物研究雑誌 編集委員
2012/07 - 2019/03 日本植物学会 図書委員
2012/01 - 2019/03 日本植物園協会 研究発表委員
2004/03 - 2012/07 日本植物学会 会務担当理事
Association Membership(s) (4)：
International Association for Plant Taxonomy
, American Society of Plant Taxonomists
, THE BOTANICAL SOCIETY OF JAPAN
, JAPANESE SOCIETY FOR PLANT SYSTEMATICS
