A three-species simplified tomato rhizosphere SynCom that steers oxylipin pathways and protects against Botrytis cinerea.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
|---|---|---|---|
| Asticcacaulis sp. — ontology label: Asticcacaulis | NCBITaxon:76890 · TaxonMech · TraitMech |
CROSS_FEEDER
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N/A |
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| Arachidicoccus sp. — ontology label: Arachidicoccus | NCBITaxon:1769012 · TaxonMech · TraitMech |
CROSS_FEEDER
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N/A |
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| Phenylobacterium sp. — ontology label: Phenylobacterium | NCBITaxon:20 · TaxonMech · TraitMech |
CROSS_FEEDER
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N/A |
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Ecological Interactions
The graph shows only explicitly linked interaction participants. Community members without an asserted participant link are omitted; membership alone does not imply an interaction.
SynCom3-associated biofilm and host defense
The three-genus tomato-root inoculum combines pathogen-inducible Asticcacaulis with stably colonizing Arachidicoccus and Phenylobacterium. The abstract attributes host-defense triggering to the inducible member and biofilm promotion to the stable colonizers, with protection similar to the 38-member precursor. These positive complementary phenotypes do not measure reciprocal bacterial fitness or metabolite exchange. Exact strain identities and selective biofilm mediation are not resolved by the inspected abstract.
Biological Processes:
- biofilm formation (GO:0042710 · PathwayMech)
SynCom3 treatment intensified oxylipin responses in infected tomato leaves. PARTIAL for biofilm formation as the mediator: the abstract links complementary community functions to protection but does not isolate biofilm formation as the unique cause of leaf pathway activation.
Evidence
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PMID:37549573 - SUPPORT (OTHER)"the phytopathogen-inducible species triggering plant defense responses and the stably-colonizing species promoting biofilm formation"
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PMID:37549573 - SUPPORT (IN_VIVO)"The simplified community exhibited similar protective effects as the 38-species community"
SynCom3-induced leaf oxylipin responses
The simplified community intensified oxylipin-pathway activation in Botrytis-infected tomato leaves. This is a host response to the bacterial treatment, not microbial mutualism or evidence that the bacteria themselves synthesize the listed divinyl ethers. The downstream biosynthesis perturbation provides stronger mechanistic evidence than association alone.
Metabolites: oxylipin (CHEBI:61121 · MediaIngredientMech · CMMMech), colneleic acid (CHEBI:60956 · MediaIngredientMech · CMMMech), colnelenic acid (CHEBI:60959 · MediaIngredientMech · CMMMech)
The host oxylipin branch supplies divinyl ethers implicated in protection: inhibiting their biosynthesis abolished the community-induced resistance, while SlLOX5/SlDES1 overexpression with higher divinyl-ether levels increased resistance. Retain this pathway-level perturbation evidence without claiming separate necessity of each compound or bacterial-to-plant transfer.
Evidence
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PMID:37549573 - SUPPORT (IN_VIVO)"the activation of oxylipin pathways in the phytopathogen-infected leaves was significantly intensified by the simplified community"
Divinyl Ether-Dependent Botrytis Protection
Inhibiting divinyl-ether biosynthesis abolished SynCom-induced tomato resistance to Botrytis cinerea. Conversely, SlLOX5/SlDES1-overexpressing plants with higher divinyl-ether levels had stronger resistance than wild type. Preserve this positive pathway-level evidence for colneleic/colnelenic-acid-associated defense. The abstract does not specify the inhibition method or establish that each named compound is independently indispensable, sufficient alone, or transferred from bacteria.
Metabolites: colneleic acid (CHEBI:60956 · MediaIngredientMech · CMMMech), colnelenic acid (CHEBI:60959 · MediaIngredientMech · CMMMech)
Evidence
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PMID:37549573 - SUPPORT (IN_VIVO)"the inhibited biosynthesis of antimicrobial divinyl ethers, including colneleic and colnelenic acid, fully abolished the community-induced plant disease resistance"
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PMID:37549573 - SUPPORT (IN_VIVO)"transgenic plants overexpressing SlLOX5 and SlDES1, with higher levels of divinyl ethers, displayed stronger resistance against B. cinerea compared to wild-type plants"
Knowledge gaps & discussions (1)
KNOWLEDGE_GAP OPEN Which microbial contributions and individual divinyl ethers mediate SynCom3 protection?
The abstract supports complementary functions, host oxylipin activation and a real biosynthesis perturbation, not merely correlation. Detailed primary methods would resolve the inhibition target, individual-compound necessity and biofilm mediation. Reciprocal bacterial benefit and cross-feeding are not established. Preserve both existing directions and positive protection without inventing a new mechanism.
Attaches to: ecological_interactions#SynCom3-associated biofilm and host defense, ecological_interactions#SynCom3-induced leaf oxylipin responses, ecological_interactions#Divinyl Ether-Dependent Botrytis Protection
1 evidence item(s)
the inhibited biosynthesis of antimicrobial divinyl ethers, including colneleic and colnelenic acid, fully abolished the community-induced plant disease resistance
Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| defined synthetic community design | A 38-species community was simplified to Asticcacaulis, Arachidicoccus, and Phenylobacterium representatives. | N/A |
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