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Poster

Session: Session 2 Presenting Authors at Posters (Evens)

P-110 - Analysis of symbiotic bacteria affecting the growth of Duckweed

Thursday, July 17, 2025
13:30 - 15:15  
Location: Confex Hall 3
Effector Interference Mechanisms

    Presenting Author(s)

  • AY

    Akiko Yoshida

    Tokyo University of Agriculture and Technology / Hosei University
    Tokyo, Tokyo, Japan

    • Author(s)

  • TK

    Takuma Kozono

    Smart-Core-Facility Promotion Organization Tokyo University of Agriculture and Technology
    Fuchu, Tokyo, Japan

  • MY

    Michiko Yasuda

    Assistant Professor
    Tokyo University of Agriculture and Technology
    Tokyo, Tokyo, Japan

  • HM

    Hiroko Maeda

    Tokyo University of Agriculture and Technology
    Fuchu-shi, Tokyo, Japan

  • NS

    Naruhito Shinbu

    Smart-Core-Facility Promotion Organization Tokyo University of Agriculture and Technology
    Fuchu-shi, Tokyo, Japan

  • YI

    Yoshiyuki ITOH

    Professor
    Smart-Core Facility Promotion Organization, Tokyo University of Agriculture and Technology, Japan
    Fuchu, Tokyo, Japan

  • NS

    Nozomu Sakurai

    Kazusa DNA Research Instituion / Natinal Institution of Genetics
    Kisarazu-shi, Tokyo, Japan

  • KO

    Kenro Oshima

    Hosei University
    Koganei -shi, Tokyo, Japan

  • SO

    Shin Okazaki

    Professor
    Tokyo University of Agriculture and Technology
    Fuchu, Tokyo, Japan

  • YF

    Yoshiharu Fujii

    Tokyo University of Agriculture and Technology
    Fuchu, Tokyo, Japan

  • TY

    Tetsuya Yamada

    Tokyo University of Agriculture and Technology
    Fuchu-shi, Tokyo, Japan


Duckweed, one of the paddy field weeds, is a free-floating weed that grows on the water surface and propagates mainly by vegetative propagation, producing clonal individuals one after another. Some Duckweed species, induces flowering under short-day conditions and self-fertilizes through self-pollination. The seeds germinate in the spring and float on the surface of the water, where they propagate again by vegetative propagation. The number of vegetative clones increases exponentially during the propagation process. We found that during the exponential Duckweed growth process, some secreted compounds are released into the culture medium when the plant population reaches a certain density. Detailed analysis of these secreted compounds revealed that they were secreted by a bacterium symbiotic with Duckweed. Furthermore, this symbiotic bacterium was found to influence the population density of the plant during the process of propagation. In recent years, the use of bacteria symbiotic with Duckweed has attracted attention for its use in growing vegetables in hydroponically grown plant factories as plant growth promoting rhizobacteria (PGPR). In this study, we report the results of the analysis of bacteria symbiotic with the identified Duckweed.