Analysis of the dynamics of plant lactic acid bacteria in nature and elucidation of the basis of disease suppression phenomenon in plants colonized by lactic acid bacteria

2023 Fiscal Year Final Research Report

• Project/Area Number: 19K22300
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 39:Agricultural and environmental biology and related fields
• Research Institution: Tohoku University
• Principal Investigator: Takahashi Hideki 東北大学, 農学研究科, 教授 (20197164)
• Co-Investigator(Kenkyū-buntansha): 北澤 春樹 東北大学, 農学研究科, 教授 (10204885)
• Project Period (FY): 2019-06-28 – 2024-03-31
• Keywords: 植物性乳酸菌 / 環境微生物 / 植物免疫

Outline of Final Research Achievements

It is known that plant lactic acid bacteria (Lactobacillus plantarum) activate the innate immune system of animals, contributing to the health of humans and livestock. In this study, we aimed to clarify the inhibitory effect of plant lactic acid bacteria isolated from the intestines of livestock against plant diseases. When plant lactic acid bacteria isolated from pig intestines and grass silage were sprayed onto the stems and leaves of tomato seedlings, and the roots of the seedlings were then inoculated with the tomato wilt bacteria, the occurrence of bacterial wilt symptoms was significantly suppressed. Since the distribution of plant lactic acid bacteria and the bacterial wilt bacteria in tomato plants is clearly different, it was thought that the plant lactic acid bacteria in the roots may induce disease resistance in plants by activating the plant immune system.

Free Research Field

植物病理学

Academic Significance and Societal Importance of the Research Achievements

植物性乳酸菌は免疫システムを活性化させて、ヒトや家畜の健康に寄与することが知られている。また、植物の茎葉には植物性乳酸菌が定着しているが、植物性乳酸菌の植物への役割についての研究は不十分である。本研究では植物性乳酸菌を植物に施用して病害抑制効果を評価することにより、自然界における植物性乳酸菌の動態と植物や動物との関係の包括的理解しようとした。研究の結果、ブタ腸管から単離された植物性乳酸菌は、トマト青枯病の発病抑制効果を持つことが明らかになった。このことは、乳酸菌を生態系の構成因子として捉え、植物・動物との関わりについての包括的理解に繋がる。さらに乳酸菌の植物病害防除資材として利用が期待される。