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2022 Fiscal Year Annual Research Report

Innovative screening of plant resistance inducers based on insect symbiotic microorganisms

Research Project

Project/Area Number 20F20103
Research InstitutionOkayama University

Principal Investigator

Ivan Galis  岡山大学, 資源植物科学研究所, 教授 (90360502)

Co-Investigator(Kenkyū-buntansha) WARI DAVID  岡山大学, 資源植物科学研究所, 外国人特別研究員
Project Period (FY) 2020-09-25 – 2023-03-31
Keywordsbrown planthopper / biological control / microbes / rice
Outline of Annual Research Achievements

This research opened many new areas of knowledge that help us to better understand the role of pest associated microbial symbionts in pest performance and host plant defense. The main current conclusions of our research allow us to propose that brown planthopper honeydew indeed contains a complex mixture of microorganisms that signal the presence and/or identity of insect invader to rice plant. However, although some signals help to activate rice defense, such as 7-113 strain, others can actually counteract plant defense, such as 6-22. It suggests that enforcing the positive regulators of defense could be used to tip the balance towards the strong defense, and the use of strains such as 7-113 could be useful for improvement of rice defense during growth, which could yield similar effects as well-known Trichoderma biocontrol agent that is currently used in plant protection. In addition, this approach is cost effective and applicable in developing countries where the access to insecticides might be very limited. Because 6-22 strain boosts salicylate signaling used by plants against pathogens, we also hope to investigate antimicrobial properties of 6-22 application.

Research Progress Status

令和4年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和4年度が最終年度であるため、記入しない。

  • Research Products

    (4 results)

All 2022

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Integrated view of plant metabolic defense with particular focus on chewing herbivores2022

    • Author(s)
      David Wari, Takako Aboshi, Tomonori Shinya, Ivan Galis
    • Journal Title

      Journal of Integrative Plant Biology

      Volume: 64 Pages: 449-475

    • DOI

      10.1111/jipb.13204

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Characterization of honeydew-associated microbes of brown planthoppers and their role in rice defense2022

    • Author(s)
      David Wari, Yuko Hojo, Akio Tani, Tomonori Shinya, Ivan Galis
    • Organizer
      The 3rd Joint Meeting of International Society of Chemical Ecology (ISCE) and the Asia-Pacific Association of Chemical Ecologists (APACE)
    • Int'l Joint Research
  • [Presentation] Characterization of honeydew-associated microbes of brown planthoppers and their role in rice defense2022

    • Author(s)
      David Wari, Yuko Hojo, Akio Tani, Tomonori Shinya, Ivan Galis
    • Organizer
      The 63rd Annual Meeting of the Japanese Society of Plant Physiology
  • [Presentation] Supplementing Nesidiocoris tenuis with a factitious diet of Artemia cysts to control Bemisia tabaci on tomato plants; a field approach2022

    • Author(s)
      David Wari, Motonori Takagi, Takeshi Saito, Toshiyuki Tezuka, Kubota Naoya, Shinsuke Sato, Takashi Ogawara
    • Organizer
      The 66th Japanese Society of Applied Entomology and Zoology

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Published: 2023-12-25  

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