Journal
NATURE ECOLOGY & EVOLUTION
Volume 6, Issue 4, Pages 383-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41559-022-01673-7
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Funding
- DAAD
- HFSP long-term fellowships [LT000348/2016-L, LT000565/2015-L]
- EMBO [LRTF 1483-2015]
- Alexander von Humboldt Foundation fellowship
- DFG [SPP 2125 DECRyPT]
- Max Planck Society
- Cluster of Excellence EXC2124 'Controlling Microbes to Fight Infection (CMFI)' [39083813]
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The community structure in the plant-associated microbiome is influenced by interactions between the host and microbes, as well as among different microbes. In this study, the researchers found that commensal Pseudomonas strains can induce a host response that selectively inhibits specific pathogenic strains, providing plant protection. The extent of this protection depends on the genetic variation of the host plant.
The community structure in the plant-associated microbiome depends collectively on host-microbe, microbe-microbe and host-microbe-microbe interactions. The ensemble of interactions between the host and microbial consortia may lead to outcomes that are not easily predicted from pairwise interactions. Plant-microbe-microbe interactions are important to plant health but could depend on both host and microbe strain variation. Here we study interactions between groups of naturally co-existing commensal and pathogenic Pseudomonas strains in the Arabidopsis thaliana phyllosphere. We find that commensal Pseudomonas prompt a host response that leads to selective inhibition of a specific pathogenic lineage, resulting in plant protection. The extent of protection depends on plant genotype, supporting that these effects are host-mediated. Strain-specific effects are also demonstrated by one individual Pseudomonas isolate eluding the plant protection provided by commensals. Our work highlights how within-species genetic differences in both hosts and microbes can affect host-microbe-microbe dynamics. The authors conduct competition experiments with multiple strains of Pseudomonas (some pathogenic and some commensal) in the phylosphere microbiome of Arabidopsis plants, showing that both the host and the commensal strains interact to inhibit the pathogenic strains.
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