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Practical verification of the usefulness of genome-edited trees using a mulberry mutant with a unique molecular structure of lignin

Research Project

Project/Area Number 23K23667
Project/Area Number (Other) 22H02402 (2022-2023)
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeMulti-year Fund (2024)
Single-year Grants (2022-2023)
Section一般
Review Section Basic Section 40020:Wood science-related
Research InstitutionTokyo University of Agriculture and Technology

Principal Investigator

Kajita Shinya  東京農工大学, (連合)農学研究科(研究院), 教授 (40323753)

Co-Investigator(Kenkyū-buntansha) 船田 良  東京農工大学, (連合)農学研究科(研究院), 教授 (20192734)
飛松 裕基  京都大学, 生存圏研究所, 教授 (20734221)
古田 裕三  京都府立大学, 生命環境科学研究科, 教授 (60343406)
神代 圭輔  京都府立大学, 生命環境科学研究科, 准教授 (00548448)
Project Period (FY) 2024-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2024: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2023: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2022: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Keywordsリグニン / 変異体 / クワ / 細胞壁
Outline of Research at the Start

ゲノム編集は染色体上にある標的遺伝子へ人為的に変異を導入する技術である。この技術は、野菜や穀物、魚類の育種をはじめ、樹木においてもその活用が急速に拡大している。本研究では、木材中に特異な分子構造のリグニンを蓄積するクワの自然突然変異体「赤材桑」を自然が生み出したゲノム編集樹木に見立て、赤材桑の孫世代(F2世代)を使った野外での生育評価と、野外および室内での栽培から得られる木材を対象とした多角的な解析を通じて、ゲノム編集によるリグニンの分子構造の改変が、木材の利用効率の向上に貢献することを実践的に検証する。

Outline of Final Research Achievements

Inhibition of biosynthesis of lignin, which accumulates in plant cell walls, is thought to significantly alter its molecular structure, contributing greatly to the extraction and subsequent utilization of polysaccharides in wood and lignin itself. In many cases, the inhibition has been achieved by genetic engineering, but in Japan, legal regulations do not facilitate the cultivation of genetically modified plants in fields. In this study, a natural mutant of mulberry, which has a mutation in cinnamyl alcohol dehydrogenase for lignin synthesis, was used as an alternative to genetically modified plants cultivated in fields and the properties of the wood obtained from them were investigated. As a result, it was confirmed that inhibition of lignin synthesis is advantageous for the use of wood.

Academic Significance and Societal Importance of the Research Achievements

本研究によりリグニンを合成するための酵素の遺伝子上の変異がリグニンの構造を変化させ、その変化が屋内での閉鎖環境ばかりでなく、圃場における自然条件下でも同様に発現することが明らかになった。また、圃場栽培で得られた変異体の木材は、加工性や分解性に優れることも明らかになった。このことは、植物の新しい育種方法として期待されるゲノム編集技術の樹木への応用を大いに後押しするものであり、研究レベルに留まっていた樹木の分子育種を社会実装するために重要な知見となるものである。

Report

(4 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Annual Research Report
  • 2022 Annual Research Report
  • Research Products

    (11 results)

All 2025 2024 2023 Other

All Int'l Joint Research (2 results) Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results) Book (1 results)

  • [Int'l Joint Research] University of Wisconsin, Madison(米国)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] Ghent University(ベルギー)

    • Related Report
      2024 Annual Research Report
  • [Journal Article] Synergetic effect of fungal pretreatment and lignin modification on delignification and saccharification: a case study of a natural lignin mutant in mulberry2025

    • Author(s)
      Madigal James Paul T.、Terasaki Masami、Takada Masatsugu、Kajita Shinya
    • Journal Title

      Biotechnology for Biofuels and Bioproducts

      Volume: 18 Issue: 1 Pages: 13-13

    • DOI

      10.1186/s13068-025-02611-y

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Hydroxycinnamaldehyde-derived benzofuran components in lignins2024

    • Author(s)
      Yoshioka Koichi、Kim Hoon、Lu Fachuang、De Ridder Nette、Vanholme Ruben、Kajita Shinya、Boerjan Wout、Ralph John
    • Journal Title

      Plant Physiology

      Volume: 194 Issue: 3 Pages: 1370-1382

    • DOI

      10.1093/plphys/kiad514

    • Related Report
      2023 Annual Research Report
  • [Presentation] Effect of fungal pretreatment on the delignification and saccharification of CAD-deficient mulberry wood2025

    • Author(s)
      James Paul T Madigal, Masatsugu Takada, Shinya Kajita
    • Organizer
      International Symposium on Wood Science and Technology
    • Related Report
      2024 Annual Research Report
  • [Presentation] Structural analysis and degradation behavior of lignin in “Sekizaisou”, a natural mulberry mutant wood, during white rot fungi pretreatment2024

    • Author(s)
      James Paul T Madigal, Masatsugu Takada, Shinya Kajita
    • Organizer
      2nd International Lignin Symposium
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 生合成経路の制御がリグニンの化学構造と木材の加工性にもたらす効果2023

    • Author(s)
      梶田真也
    • Organizer
      第75回日本生物工学会大会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 赤材桑×国桑 21 号のF2 集団を用いたクワ連鎖地図とゲノム配列の比較解析2023

    • Author(s)
      鈴木未来, 小山朗夫, 植本満希, 梶田真也, 松村英生
    • Organizer
      日本育種学会 第144回講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Influence of selective fungal degradation on the saccharification of CAD-deficient mulberry wood: The case of natural mutant wood from Sekizaisou2023

    • Author(s)
      Madigal JP, Takada M, Kajita S
    • Organizer
      第68回リグニン討論会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Lignin metabolic engineering in mutants and transgenics2023

    • Author(s)
      Kajita S
    • Organizer
      The Second International Mini-symposium on Wood Science
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Book] バイオマス2025

    • Author(s)
      宮藤久士・河本晴雄・梶田真也・亀井一郎 編著
    • Total Pages
      224
    • Publisher
      海青社
    • ISBN
      4860990706
    • Related Report
      2024 Annual Research Report

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Published: 2022-04-19   Modified: 2026-01-16  

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