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Cell Host Microbe. 2018 Jul 11;24(1):155-167.e5. doi: 10.1016/j.chom.2018.06.006.

Modular Traits of the Rhizobiales Root Microbiota and Their Evolutionary Relationship with Symbiotic Rhizobia.

Author information

1
Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Cologne 50829, Germany; Cluster of Excellence on Plant Sciences, Dusseldorf 40225, Germany.
2
Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Cologne 50829, Germany; University of Texas Austin, Marine Science Institute, Port Aransas, TX 78373, USA.
3
Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Cologne 50829, Germany.
4
AgBiome, 104 T.W. Alexander Drive, Building 1, Research Triangle Park, NC 27709, USA.
5
Department of Computational Biology of Infection Research, Helmholtz Center for Infection Research, Braunschweig 38124, Germany.
6
Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Cologne 50829, Germany; Cluster of Excellence on Plant Sciences, Dusseldorf 40225, Germany. Electronic address: schlef@mpipz.mpg.de.

Abstract

Rhizobia are a paraphyletic group of soil-borne bacteria that induce nodule organogenesis in legume roots and fix atmospheric nitrogen for plant growth. In non-leguminous plants, species from the Rhizobiales order define a core lineage of the plant microbiota, suggesting additional functional interactions with plant hosts. In this work, genome analyses of 1,314 Rhizobiales isolates along with amplicon studies of the root microbiota reveal the evolutionary history of nitrogen-fixing symbiosis in this bacterial order. Key symbiosis genes were acquired multiple times, and the most recent common ancestor could colonize roots of a broad host range. In addition, root growth promotion is a characteristic trait of Rhizobiales in Arabidopsis thaliana, whereas interference with plant immunity constitutes a separate, strain-specific phenotype of root commensal Alphaproteobacteria. Additional studies with a tripartite gnotobiotic plant system reveal that these traits operate in a modular fashion and thus might be relevant to microbial homeostasis in healthy roots.

KEYWORDS:

commensalism; microbiota; phylogenomics; plant immunity; rhizobiales; symbiosis

PMID:
30001518
PMCID:
PMC6053594
DOI:
10.1016/j.chom.2018.06.006
[Indexed for MEDLINE]
Free PMC Article

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