Tomato variety Hawaii 7996 is resistant to the soil-borne pathogen Ralstonia solanacearum, whereas the Moneymaker variety is susceptible to the pathogen. To evaluate whether plant-associated microorganisms have a role in disease resistance, we analyzed the rhizosphere microbiomes of both varieties in a mesocosm experiment. Microbiome structures differed between the two cultivars. Transplantation of rhizosphere microbiota from resistant plants suppressed disease symptoms in susceptible plants. Comparative analyses of rhizosphere metagenomes from resistant and susceptible plants enabled the identification and assembly of a flavobacterial genome that was far more abundant in the resistant plant rhizosphere microbiome than in that of the susceptible plant. We cultivated this flavobacterium, named TRM1, and found that it could suppress R. solanacearum-disease development in a susceptible plant in pot experiments. Our findings reveal a role for native microbiota in protecting plants from microbial pathogens, and our approach charts a path toward the development of probiotics to ameliorate plant diseases.
Bibliographical noteFunding Information:
We would like to thank members of the laboratories of J.F.K. and S.-W.L., including B.K. Kim, K.Y. Baek, T.-H. Kang, S. Kim, H.G. Lee, S.Y. Lee, G.J. Son, S. Yoo and H. Yu, as well as KRIBB-KOBIC and NABIC, for technical support, and Y.-S. Bahn, D. Choi, S.-Y. Kwon, I. Lee, W.-J. Lee and H.-S. Pai for helpful comments and suggestions. This study was financially supported by the Strategic Initiative for Microbiomes in Agriculture and Food (914001-4 to J.F.K. and 914006-4 to J.Y.S.), the Cooperative Research Program for Agricultural Science & Technology Development (PJ01093901 to S.-W.L.), the National Research Foundation (NRF-2014M3C9A33068822 and NRF-2011-0017670 to J.F.K.), and the Next-Generation BioGreen 21 Program (PJ008201 to S.-W.L.) of the Republic of Korea. Publication was supported in part by the Brain Korea 21 PLUS program, and M.-J.K., S.-K.K. and J.L. are fellowship awardees of the program.
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All Science Journal Classification (ASJC) codes
- Applied Microbiology and Biotechnology
- Molecular Medicine
- Biomedical Engineering