Abstract
Crops lack genetic resistance to most necrotrophic pathogens. To compensate for this disadvantage, plants recruit antagonistic members of the soil microbiome to defend their roots against pathogens and other pests. The best examples of this microbially based defense of roots are observed in disease-suppressive soils in which suppressiveness is induced by continuously growing crops that are susceptible to a pathogen, but the molecular basis of most is poorly understood. Here we report the microbial characterization of a Korean soil with specific suppressiveness to Fusarium wilt of strawberry. In this soil, an attack on strawberry roots by Fusarium oxysporum results in a response by microbial defenders, of which members of the Actinobacteria appear to have a key role. We also identify Streptomyces genes responsible for the ribosomal synthesis of a novel heat-stable antifungal thiopeptide antibiotic inhibitory to F. oxysporum and the antibiotic’s mode of action against fungal cell wall biosynthesis. Both classical- and community-oriented approaches were required to dissect this suppressive soil from the field to the molecular level, and the results highlight the role of natural antibiotics as weapons in the microbial warfare in the rhizosphere that is integral to plant health, vigor and development.
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Acknowledgements
Part of this work was supported by RDA of Korea (PJ010827). Other funding included Royal Society, UK (516002.K5677/ROG) to HH, an NRF grant (NRF-2011-0017670) to JFK, NIH grant (GM97509) to BSM, BK21 PLUS to HC and S-KK and a DFG postdoctoral fellowship to MC. We thank Tim Paulitz for helpful discussions.
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Cha, JY., Han, S., Hong, HJ. et al. Microbial and biochemical basis of a Fusarium wilt-suppressive soil. ISME J 10, 119–129 (2016). https://doi.org/10.1038/ismej.2015.95
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DOI: https://doi.org/10.1038/ismej.2015.95
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