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AZUMA Takayuki

Field Science Center for Northern Biosphere　Agro-Ecosystem Research Station　Botanic GardenAssistant Professor

1971年、北海道川上郡弟子屈町生まれ。東北大学理学部、大学院理学研究科で植物分類学を学ぶ。大学院生の頃の研究テーマは、ヤナギ科植物雄花の構造と系統分類学的意義。現在はヤナギ科に加え、スミレ属の系統分類、絶滅危惧種の集団遺伝解析、北海道の地域フロラについて研究を行う。北海道農業試験場非常勤研究員、北海道大学農学部GCOE研究員を経て、現在北海道大学北方生物圏フィールド科学センター植物園 助教。

Researcher basic information

■ Degree
  • 博士（理学）, 東北大学
■ URL
researchmap URL■ Various IDs
Researcher number
  • 20333651
J-Global ID■ Research Keywords and Fields
Research Keyword
  • 地域植物相
  • molecular phylogeny
  • Endangered plants
  • Plant taxonomy
  • Viola
  • Salicaceae
■ Educational Organization

Career

■ Career
Career
  • Nov. 2000 - Feb. 2001
    北海道大学農学部, 応用生命化学科, 中核的研究機関研究員, Japan
  • Apr. 2000 - Oct. 2000
    北海道農業試験場, 地域基盤研究部, 非常勤研究員, Japan
Committee Memberships
  • Jul. 2021 - Present
    環境省, 希少野生動植物種保存推進委員, Government
  • Jan. 2019 - Present
    日本植物分類学会, 絶滅危惧植物専門第一委員, Society
  • Jan. 2019 - Dec. 2022
    日本植物分類学会, 編集委員, Society
  • May 2010 - May 2014
    日本植物園協会, 生物多様性保全委員, Society
  • Jan. 2007 - Dec. 2010
    日本植物分類学会, ニュースレター編集幹事, Society

Research activity information

■ Papers
  • Androecial Development and Anther Orientation in Male Flowers of Idesia and Allied Genera of Salicaceae Tribe Saliceae
    Nemoto Tomoyuki; Azuma Takayuki; Murata Jin
    The Journal of Japanese Botany, 100, 6, 542, 562, The Editorial Board of The Journal of Japanese Botany, 20 Dec. 2025, [Peer-reviewed]
    English, Androecial development and anther orientation were examined for the male flowers of Idesia polycarpa, Itoa orientalis, Poliothyrsis sinensis and Xylosma congesta of tribe Saliceae in Salicaceae. Stamens initiate centrifugally in all species. In Id. polycarpa, however, the stamen primordia of the outermost whorl develop faster than the adjacent inner ones. This irregular developmental sequence makes these peripheral stamens appear to have initiated centripetally. In Id. polycarpa, moreover, the stamens borne centrifugally in the central part of the flower have extrorse anthers, whereas the outermost stamens have introrse ones. In other three species all anthers are extrorse. The irregular stamen development is closely associated with the unique anther orientation in Id. polycarpa. Idesia polycarpa has small nectary glands arranged in a row between the outermost whorl of stamens with introrse anthers and the inner whorls of stamens with extrorse anthers. Although It. orientalis and P. sinensis have no floral nectaries, X. congesta has discoid floral nectary located external to androecium, anthers of which are all extrorse and face the nectary. Those anthers of Idesia polycarpa are all face the row of nectary glands on both sides.
  • New name of the Artemisia species (Asteraceae) endemic to Maguntan mud volcano, Sakhalin, Russia
    Hideki Takahashi; Vyacheslav Yuryevich Barkalov; Hidetoshi Nagamasu; Takayuki Azuma
    Journal of Japanese Botany, 98, 5, 221, 226, Oct. 2023, [Peer-reviewed], [Last author]
    English, Scientific journal
  • Different nitrogen acquirement and utilization strategies might determine the ecological competition between ferns and angiosperms
    Chengming Zhang; Chaoqun Zhang; Takayuki Azuma; Hayato Maruyama; Takuro Shinano; Toshihiro Watanabe
    Annals of Botany, Oxford University Press (OUP), 20 Jan. 2023
    Scientific journal, Abstract

    Background and Aims

    The abundance or decline of fern populations in response to environmental change has been found to be largely dependent on specific physiological properties that distinguish ferns from angiosperms. Many studies have focused on water use efficiency and stomatal behaviours, but the effects of nutrition acquirement and utilization strategies on niche competition between ferns and flowering plants are rarely reported.

    Methods

    We collected 34 ferns and 42 angiosperms from the Botanic Garden of Hokkaido University for nitrogen (N), sulphur (S), NO3− and SO42− analysis. We then used a hydroponic system to compare the different N and S utilization strategies between ferns and angiosperms under N deficiency conditions.

    Key Results

    Ferns had a significantly higher NO3−-N concentration and NO3−-N/N ratio than angiosperms, although the total N concentration in ferns was remarkably lower than that in the angiosperms. Meanwhile, a positive correlation between N and S was found, indicating that nutrient concentration is involved in assimilation. Pteris cretica, a fern species subjected to further study, maintained a slow growth rate and lower N requirement in response to low N stress, while both the biomass and N concentration in wheat (Triticum aestivum) responded quickly to N deficiency conditions.

    Conclusions

    The different nutritional strategies employed by ferns and angiosperms depended mainly on the effects of phylogenetic and evolutionary diversity. Ferns tend to adopt an opportunistic strategy of limiting growth rate to reduce N demand and store more pooled nitrate, whereas angiosperms probably utilize N nutrition to ensure as much development as possible under low N stress. Identifying the effects of mineral nutrition on the evolutionary results of ecological competition between plant species remains a challenge.
  • Phylogeography of the East Asian grassland plant, Viola orientalis (Violaceae), inferred from plastid and nuclear restriction site-associated DNA sequencing data
    Haruna Sata; Midori Shimizu; Takaya Iwasaki; Hajime Ikeda; Akiko Soejima; Andrey E. Kozhevnikov; Zoya V. Kozhevnikova; Hyoung-Tak Im; Su-Kil Jang; Takayuki Azuma; Atsushi J. Nagano; Noriyuki Fujii
    Journal of Plant Research, 134, 6, 1181, 1198, Springer Science and Business Media LLC, 30 Sep. 2021, [Peer-reviewed]
    Scientific journal
  • "Illustrated Flora of Saghalien" and "Flora of Sakhalin" by Shigezo Sugawara
    Hideki Takahashi; Takayuki Azuma
    Journal of Japanese Botany, 96, 3, 186, 190, Jun. 2021, [Peer-reviewed], [Last author]
    Japanese, Scientific journal
  • Ionomic variation in leaves of 819 plant species growing in the botanical garden of Hokkaido University, Japan
    Toshihiro Watanabe; Takayuki Azuma
    Journal of Plant Research, Jan. 2021, [Peer-reviewed], [Last author]
    English, Scientific journal
  • チシマセンブリのサハリン島分布について
    高橋英樹; 東隆行
    植物地理・分類研究, 68, 1, 67, 70, May 2020, [Peer-reviewed], [Last author]
    Scientific journal
  • The vascular plant flora of Masuura coast, Kushiro city
    Yukio TOCHIHARA; Takayuki AZUMA
    Memoirs of the Kushiro City Museum, 38, 9, 14, Mar. 2019
    Japanese, Research institution
  • North boundary of Myosoton aquaticum (L.) Moench (Caryophyllaceae) geographical distribution in the East Asia
    A.E. Kozhevnikov; Z.V. Kozhevnikova; A. Anderberg; J. Klackenberg; T. Azuma; H. Takahashi
    V.L. Komarov Memorial Lectures, 65, 83, 88, Federal Scientific Center of the East Asia Terrestrial Biodiversity, FEB RAS, 2018
    Scientific journal
  • Integrated locality records reveal the recent status and habitat characteristics of Amsonia elliptica, a threatened perennial herb in Japan
    Fujita Hiroko; Kagawa Keisuke; Azuma Takayuki
    Japanese Journal of Conservation Ecology, 21, 1, 77, 92, 一般社団法人 日本生態学会, 2016
    Japanese, The perennial herbaceous plant <i>Amsonia elliptica</i> has been designated an endangered species (near threatened, NT) in Japan due to its recent rapid decline in abundance and decreased habitat patches, but there are no precise locality records and habitat characteristics, which are essential for conservation. We first compiled distribution records for <i>A. elliptica</i> from a variety of sources, such as herbarium specimens, publications, and personal information, and then conducted a field survey to examine the numbers of shoots at each locality and the habitat characteristics. A total of 180 locality records were obtained for 38 prefectures from Hokkaido to Miyazaki Prefecture. Of these, we confirmed extinction in seven prefectures, but could not confirm either presence or absence in seven prefectures. Integrated locality records supplemented with our field survey suggested that habitats affected by periodic flooding and high groundwater levels, such as lakefronts, riverbeds, small valley bottoms, and valley slopes, were suitable habitats, and reduced natural disturbance due to flood-control practices and artificial modification of the original topography caused deterioration of habitat suitable for <i>A. elliptica</i>.
  • 南湖公園の生物多様性保全 福島県白河市南湖の水生植物相の変遷
    薄葉満; 黒沢高秀; 東隆行
    福島大学地域創造, 22, 2, 6789-6804, 15 Mar. 2011
    Japanese
  • Characterization of the repetitive sequences in a 200-kb region around the rice waxy locus: diversity of transposable elements and presence of veiled repetitive sequences
    H Nagano; M Kunii; T Azuma; Y Kishima; Y Sano
    GENES & GENETIC SYSTEMS, 77, 2, 69, 79, Apr. 2002, [Peer-reviewed]
    English, Scientific journal
  • The Female Plant of *Toisochosenia kamikotica (Kimura) Kimura (Salicaceae).
    OHASHI HIROYOSHI; IMAI TAKANE; AZUMA TAKAYUKI
    植物研究雑誌, 75, 2, 98-103, 103, 津村研究所, 20 Apr. 2000, [Peer-reviewed]
    Japanese
  • Phylogenetic relationships of Salix (Salicaceae) based on rbcL sequence data
    T Azuma; T Kajita; J Yokoyama; H Ohashi
    AMERICAN JOURNAL OF BOTANY, 87, 1, 67, 75, Jan. 2000, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal
■ Other Activities and Achievements
■ Books and other publications
  • サロベツ湿原と稚咲内砂丘林帯湖沼群
    東隆行, サロベツ湿原域の植物相、砂丘林帯の植物相
    北海道大学出版会, Nov. 2014, [Contributor]
  • 新しい植物分類学I
    東隆行, ヤナギ属（ヤナギ科）
    講談社, Mar. 2012, [Contributor]
  • 北大エコキャンパス読本―植物園編―
    東隆行
    北海道大学教育GP「博物館を舞台とした体験型全人教育の推進」/北海道大学総合博物館, Feb. 2010, [Editor]
  • 森林・林業百科事典
    東隆行, オオバヤナギ属, ケショウヤナギ属, ヤナギ属, ヤマナラシ属
    丸善, May 2001, [Contributor]
■ Lectures, oral presentations, etc.
  • 北海道各地域の植物相の特色
    東隆行
    日本植物学会第87回大会公開講演, 09 Sep. 2023, Japanese, Public discourse
    07 Sep. 2023 - 09 Sep. 2023, 41783447, [Invited]
  • Phylogeny of Viola brevistipulata s. l. (Violaceae) using trnT-L, trnL-F and ITS sequence data
    Takayuki AZUMA; Tomoyuki NEMOTO; Yumi YAMASHITA; Tomonari OIKAWA; Hitoshi KOMATSU; Hideki TAKAHASHI; Takahide KUROSAWA
    The 80th annual meeting of the botanical society of Japan, 16 Sep. 2016, Japanese, Poster presentation
    [Domestic Conference]
  • Population genetics in the endangered species Hylotelephium cauticola (Crassulaceae)
    Takayuki AZUMA
    The 14th annual meeting of the Japanese society for plant systematics, 08 Mar. 2015, Japanese, Oral presentation
    [Domestic Conference]
  • 植物の DNA はカンラン岩地とそれ以外で違っているのか〜様似町における4種の事例〜
    東隆行
    様似町ふるさとジオ塾特別講座, 20 Feb. 2015, Japanese, Public discourse
    [Invited]
  • Phylogenetic relationships of Viola brevistipulata s. l. (Violaceae)
    Takayuki AZUMA; Tomoyuki NEMOTO; Hideki TAKAHASHI
    The 13th annual meeting of the Japanese society for plant systematics, 22 Mar. 2014, Japanese, Poster presentation
    [Domestic Conference]
  • 進撃の系統分類学〜ヤナギ科の場合〜
    東隆行
    北海道高山植物保護ネット2013年度市民フォーラム お花畑は、いま‥2013, 16 Nov. 2013, Japanese, Public discourse
    [Invited]
  • Phylogenetic placement of endemic species in Hokkaido, Viola kitamiana (Violaceae)
    Takayuki AZUMA; Hideki TAKAHASHI
    The 11th annual meeting of the Japanese society for plant systematics, 23 Mar. 2012, Japanese, Oral presentation
    [Domestic Conference]
  • Cs concentration in the species of Angiosperm
    Takayuki AZUMA; Toshihiro WATANABE
    The 75th annual meeting of the botanical society of Japan, 17 Sep. 2011, Japanese, Oral presentation
    [Domestic Conference]
  • Phylogeography of endangered species Amsonia elliptica (Asclepiaceae)
    Keisuke KAGAWA; Takayuki AZUMA; Hiroko FUJITA
    The 9th annual meeting of the Japanese society for plant systematicsh, 26 Mar. 2010, Japanese, Poster presentation
    [Domestic Conference]
  • Phylogeny of Salicaceae
    Takayuki AZUMA
    The 11th symposium in Hokkaido University Museum, 16 Apr. 2005, Japanese, Nominated symposium
    [Invited], [Domestic Conference]
  • Organogenesis of male flower on Salix arbutifolia and four Populous species (Salicaceae)
    Takayuki AZUMA; Tomoyuki NEMOTO; Hiroyoshi OHASHI
    The 2nd annual meeting of the Japanese society for plant systematics, 15 Mar. 2003, Japanese, Poster presentation
    [Domestic Conference]
  • Characterization of the repetitive sequences around the rice waxy locus
    Takayuki AZUMA; Hironori NAGANO; Motoyuki KUNII; Yuji KISHIMA; Yoshio SANO
    The 65th annual meeting of the botanical society of Japan, 27 Sep. 2001, Japanese, Poster presentation
    [Domestic Conference]
  • Evolutional and phylogenetic discussion on the structure of male flowers in Salicaceae using rbcL phylogeny
    Takayuki AZUMA; Tomoyuki NEMOTO; Hiroyoshi OHASHI
    The 47th annual meeting of the botanical society of Japan, Hokkaido branch, 22 Jul. 2000, Japanese, Oral presentation
    [Domestic Conference]
  • The pattern of androecial arrangement in Salicoideae (Salicaceae)
    Takayuki AZUMA; Tomoyuki NEMOTO; Hiroyoshi OHASHI
    The 63rd annual meeting of the botanical society of Japan, 05 Oct. 1999, Japanese, Oral presentation
    [Domestic Conference]
  • Androecial arrangement of Salicoideae (Salicaceae)
    Takayuki AZUMA; Tomoyuki NEMOTO; Hiroyoshi OHASHI
    The 28th annual meeting of Japan society of plant taxonomists, 21 Mar. 1998, Japanese, Oral presentation
    [Domestic Conference]
  • Phylogenetic relationships of Salicaceae using chloroplast rbcL sequence data
    Takayuki AZUMA; Hiroyoshi OHASHI
    The 9th annual meeting of the botanical society of Japan, Tohoku branch, 22 Dec. 1995, Japanese, Oral presentation
    [Domestic Conference]
■ Syllabus
  • 生物生態・体系学特論Ⅰ, 2024年, 修士課程, 農学院
  • 大学院共通授業科目（一般科目）：自然科学・応用科学, 2024年, 修士課程, 大学院共通科目
  • ﾌｨーﾙﾄﾞ科学基礎論, 2024年, 修士課程, 環境科学院
  • 植物分類・生態学, 2024年, 学士課程, 農学部
  • 農場実習, 2024年, 学士課程, 農学部
  • 国際交流Ⅱ, 2024年, 学士課程, 国際本部
  • 英語演習, 2024年, 学士課程, 全学教育
■ Research Themes
  • Relationship between vascular plant evolution and aluminum hyperaccumulation
    Grants-in-Aid for Scientific Research
    01 Apr. 2023 - 31 Mar. 2027
    渡部 敏裕; 和崎 淳; 平舘 俊太郎; 佐野 雄三; 丸山 隼人; 東 隆行
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 23H02108
  • 寒冷圏の常緑樹において冬季に特徴的な２つの光合成防御機構の種間分布
    科学研究費助成事業
    Apr. 2024 - Mar. 2027
    田中 亮一; 東 隆行; 北尾 光俊
    日本学術振興会, 基盤研究(B), 北海道大学, 24K01806
  • 個体群の遺伝的多様性推移におよぼす復元手法の影響
    科学研究費助成事業 基盤研究(C)
    Apr. 2022 - Mar. 2027
    我妻 尚広; 東 隆行; 水島 未記; 森 志郎
    日本学術振興会, 基盤研究(C), 酪農学園大学, 22K05713
  • カンラン岩流域と森林形態が物質フローおよび陸域・沿岸域生物資源に与える影響の解明
    基盤研究（B）（一般）
    Apr. 2013 - Mar. 2017
    笹賀一郎
    日本学術振興会, Competitive research funding
  • ケショウヤナギSalix arbutifolia の雄花の器官発生
    独創的研究助成
    Apr. 2001 - Mar. 2002
    東隆行
    財団法人北海道大学クラーク記念財団, Principal investigator, Competitive research funding