Microbial degradation and plant disease suppression of both mycotoxin and virulence factor

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05595
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 39040:Plant protection science-related
• Research Institution: Nagoya University
• Principal Investigator: Sato Ikuo 名古屋大学, 生命農学研究科, 助教 (70743102)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: かび毒 / 赤かび病 / 生物防除 / かび毒分解微生物

Outline of Final Research Achievements

The suppression of disease onset was examined using wheat, the fusarium pathogen, and DON-degrading bacterial strain SS3 or its mutants with reduced DON metabolic capacity. In the USU-Apogee variety (weakly resistant to fusarium head blight), the suppressive effect of the mutant strain was significantly lower than that of the wild strain, indicating that the suppressive effect of the mutant strain was reduced due to defective DON degradation. On the other hand, no significant difference in suppression was observed between the mutant and the wild strain in the same test using the variety No. 61 (moderately resistant to fusarium head blight), indicating that one of the mechanisms of suppression of fusarium head blight onset by the SS3 strain is DON-degrading metabolism. However, the degree of contribution of DON-degrading bacteria to the suppressive effect of DON-degrading and metabolizing bacteria on wheat varied among wheat cultivars.

Free Research Field

植物病理学

Academic Significance and Societal Importance of the Research Achievements

本研究は作物上でかび毒の蓄積と植物病害の発生の双方を抑制する微生物の選抜と発症抑制機構の解明を目指した。DONはかび毒であり病原性関連因子でもあるので、病原性関連因子を分解できる微生物の処理によって植物病原菌の病徴発現をも抑制が可能かを検証した研究でもある。かび毒代謝能変異株の植物病の発症抑制能が野生株に比べ低下することを明らかにしたことで、病原性関連因子を分解能にもとづいて微生物が発病抑制に貢献しうることが、より明らかになった。