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TYQ1 Nematode Biocontrol SynCom

Community ID CommunityMech:000072
Ecological State ENGINEERED
Environment cucumber rhizosphere — ontology label: rhizosphere
ENVO:00005801 · HabitatMech ↗

An 8-member synthetic community centered on keystone species Rhizobium pusense TYQ1, which is enriched during root-knot nematode (Meloidogyne incognita) infection of cucumber (Cucumis sativus cv. Zhongnong 26). TYQ1 recruits 7 biomarker species that enhance biofilm formation and metabolic cross-feeding, creating a tightly interconnected network for synergistic nematode suppression. The community was identified through stress-induced enrichment analysis and validated across 12 soil types, demonstrating that keystone species recruitment can guide functional microbial community assembly to synergistically enhance plant health.

Taxonomy

Taxon Ontology ID Functional Roles Abundance
Rhizobium pusense TYQ1 — ontology label: Agrobacterium pusense NCBITaxon:648995 · TaxonMech · TraitMech
PATHOGEN_ANTAGONIST
DOMINANT
  • PMID:41660888 - SUPPORT (IN_VIVO)
    "This strain not only directly inhibited RKNs but also caused the restructuring of the rhizobacterial community, thereby leading to the enrichment of multiple biomarker species"
Sphingomonas panni SP — ontology label: Sphingomonas panni NCBITaxon:237612 · TaxonMech · TraitMech
CROSS_FEEDER
N/A
  • PMID:41660888 - SUPPORT (IN_VIVO)
    "These enriched microorganisms, in collaboration with TYQ1, enhanced the biofilm-forming ability of the community and established a tightly interconnected metabolic interaction network"
Sphingomonas xanthus SX — ontology label: Sphingomonas NCBITaxon:13687 · TaxonMech · TraitMech
CROSS_FEEDER
DOMINANT
  • PMID:41660888 - SUPPORT (IN_VIVO)
    "These enriched microorganisms, in collaboration with TYQ1, enhanced the biofilm-forming ability of the community and established a tightly interconnected metabolic interaction network"
Acidovorax soli AS — ontology label: Acidovorax soli NCBITaxon:592050 · TaxonMech · TraitMech
CROSS_FEEDER
N/A
  • PMID:41660888 - SUPPORT (IN_VIVO)
    "These enriched microorganisms, in collaboration with TYQ1, enhanced the biofilm-forming ability of the community and established a tightly interconnected metabolic interaction network"
Acidovorax facilis AF — ontology label: Acidovorax NCBITaxon:12916 · TaxonMech · TraitMech
PRIMARY_DEGRADER
N/A
  • PMID:41660888 - SUPPORT (IN_VIVO)
    "the TYQ1-centered synthetic community exhibited more efficient and stable inhibition of RKNs"
Novosphingobium subterraneum NS — ontology label: Novosphingobium subterraneum NCBITaxon:48936 · TaxonMech · TraitMech
CROSS_FEEDER
N/A
  • PMID:41660888 - SUPPORT (IN_VIVO)
    "These enriched microorganisms, in collaboration with TYQ1, enhanced the biofilm-forming ability of the community and established a tightly interconnected metabolic interaction network"
Xenophilus aerolatus XA — ontology label: Xenophilus aerolatus NCBITaxon:452922 · TaxonMech · TraitMech
CROSS_FEEDER
N/A
  • PMID:41660888 - SUPPORT (IN_VIVO)
    "These enriched microorganisms, in collaboration with TYQ1, enhanced the biofilm-forming ability of the community and established a tightly interconnected metabolic interaction network"
Microbacterium arborescens MA — ontology label: Microbacterium arborescens NCBITaxon:33883 · TaxonMech · TraitMech
CROSS_FEEDER
N/A
  • PMID:41660888 - SUPPORT (IN_VIVO)
    "These enriched microorganisms, in collaboration with TYQ1, enhanced the biofilm-forming ability of the community and established a tightly interconnected metabolic interaction network"

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.

Ecological interaction network for TYQ1 Nematode Biocontrol SynCom Bipartite graph where circles represent taxa and non-circular symbols represent interactions, with distinct shapes and colours for cross-feeding. Rare or untyped interactions share the Other symbol; exact curated types remain in the interaction details.
Taxon
Cross-feeding
Other

Keystone-Mediated Community Recruitment

TYQ1 inoculation changes the cucumber rhizobacterial community relative to uninoculated controls and enriches biomarker OTUs from which seven partner strains were selected. This intervention is distinct from the initial nematode-induced enrichment of TYQ1. Relative-abundance enrichment alone does not establish mutual fitness benefit, absolute growth of every partner, or a compound-specific recruitment mechanism.

Source Taxon: Rhizobium pusense TYQ1

Biological Processes:

Downstream Effects:
→ TYQ1-partner biofilm enhancement

PARTIAL: TYQ1 inoculation enriches the pool of partners whose reconstructed pairings enhance biofilm in vitro. This supports a recruitment-to-biofilm hypothesis across the linked assays, not direct measurement of biofilm mediation in the root community.

→ Condition-dependent TYQ1 spent-medium cross-feeding

PARTIAL: TYQ1-driven partner enrichment provides members with experimentally demonstrated spent-medium utilization. The reconstructed laboratory network does not establish that the same directional fluxes occur in situ after recruitment.

Evidence

  • PMID:41660888 - SUPPORT (IN_VIVO)
    "This strain not only directly inhibited RKNs but also caused the restructuring of the rhizobacterial community, thereby leading to the enrichment of multiple biomarker species"

TYQ1-partner biofilm enhancement

All seven TYQ1-partner pairings increased the measured biofilm phenotype in vitro. Colony attraction is a separate assay: SX showed no obvious attraction or repulsion, while the other six partners induced colony enlargement with TYQ1. These observations do not establish bilateral growth benefit for all pairs or prove that biofilm enhancement mediates nematode suppression in roots.

Source Taxon: Rhizobium pusense TYQ1

Biological Processes:

Downstream Effects:
→ Synergistic Nematode Suppression

PARTIAL: increased biofilm may support the observed transient increase in TYQ1 root colonization and contribute to suppression. The study does not selectively disrupt biofilm while preserving other TYQ1 and partner functions, so mediation remains unresolved.

Evidence

  • PMID:41660888 - SUPPORT (IN_VITRO)
    "all strains exhibited a synergistic effect with TYQ1 in biofilm formation"
  • PMID:41660888 - SUPPORT (IN_VITRO)
    "With the exception of SX, which did not display obvious attraction or repulsion toward TYQ1"

Condition-dependent TYQ1 spent-medium cross-feeding

CROSS_FEEDING

Metabolite-feeding assays support a cross-feeding network, with important medium and direction limits. TYQ1 grows on filtrates of all seven partners in M9; six partners grow on TYQ1-derived metabolites, with AS the reported exception. In TSB, adding TYQ1 supernatant generally increases partner growth rates without changing carrying capacity, whereas partner supernatants do not enhance TYQ1 growth. Directed network weights summarize fitted carrying capacities, not measured metabolite fluxes. Gephi node removal is an in-silico centrality analysis, distinct from biological strain omission. No particular exchanged molecule or obligatory seven-way mutualism is established.

Source Taxon: Rhizobium pusense TYQ1

Biological Processes:

Downstream Effects:
→ Synergistic Nematode Suppression

PARTIAL: assayed exchange capacity may support the community that improves nematode suppression. Biological TYQ1 omission and diversity gradients support its community contribution, but neither isolate exchange from direct nematicidal activity, biofilm effects or host responses. In-silico node removal is not that biological test.

Evidence

  • PMID:41660888 - SUPPORT (IN_VITRO)
    "TYQ1 could utilize the metabolites secreted by all seven enriched strains for growth"
  • PMID:41660888 - SUPPORT (IN_VITRO)
    "Except for AS, which exhibited a relatively slow background growth in M9 basic medium, the other six strains could also grow using the metabolites of TYQ1"
  • PMID:41660888 - SUPPORT (IN_VITRO)
    "the supernatant of the enriched strains did not influence TYQ1growth"
  • PMID:41660888 - SUPPORT (COMPUTATIONAL)
    "directed edge weights defined as the carrying capacity (K) derived from logistic growth curve fitting"

Synergistic Nematode Suppression

The eight-member consortium enhances nematode suppression and cucumber performance compared with TYQ1 alone in the tested pot assays. Actual leave-one-strain-out and diversity-gradient communities support a major contribution of TYQ1: omitting it abolishes efficient suppression and can promote egg-mass formation. The source reports validation in 12 soil types, not universal field performance. Root defense-expression and metabolite changes accompany protection, but neither strain omission nor these profiles isolate biofilm, specific cross-fed metabolites, or host defense as the sole mediator. Plant benefit is not evidence of mutual fitness benefit among all microbes.

Biological Processes:

Evidence

  • PMID:41660888 - SUPPORT (IN_VIVO)
    "the TYQ1-centered SynCom is significantly more effective than the single inoculation of TYQ1"
  • PMID:41660888 - SUPPORT (IN_VIVO)
    "The -TYQ1 not only lost its inhibitory function but even had the opposite effect, facilitating the formation of egg masses on the roots."
  • PMID:41660888 - PARTIAL (IN_VIVO)
    "535 commonly induced DEGs enriched in defense and abscisic acid response pathways"

Associated Datasets

Dataset Type Repository Accession
16S Amplicon Sequencing (Rhizosphere)
16S rRNA amplicon sequencing data from cucumber rhizosphere under RKN infection across multiple soil types. 		AMPLICON_16S NCBI_BIOPROJECT PRJNA1313845
16S Amplicon Sequencing (SynCom Validation)
16S rRNA amplicon sequencing data from SynCom validation experiments. 		AMPLICON_16S NCBI_BIOPROJECT PRJNA1313795
Transcriptomics
Transcriptomic data for understanding gene expression in TYQ1-centered SynCom during nematode biocontrol. 		METATRANSCRIPTOMICS NCBI_BIOPROJECT PRJNA1314495

Knowledge gaps & discussions (1)

KNOWLEDGE_GAP OPEN How much of TYQ1-dependent nematode suppression is specifically mediated by biofilm or metabolite exchange?

Pairwise biofilm and filtrate assays support real functions, and biological strain omission supports the contribution of TYQ1. Removing an organism also removes its direct nematicidal and host-modulating effects; it is not a selective biofilm or exchange perturbation. The reported colonization increase is transient within the first week. Medium-matched and mechanism-specific loss/rescue experiments are needed to resolve the two downstream mediation arrows without erasing the positive consortium outcome.

Attaches to: ecological_interactions#Keystone-Mediated Community Recruitment, ecological_interactions#TYQ1-partner biofilm enhancement, ecological_interactions#Condition-dependent TYQ1 spent-medium cross-feeding, ecological_interactions#Synergistic Nematode Suppression

1 evidence item(s)
PMID:41660888

The -TYQ1 not only lost its inhibitory function but even had the opposite effect, facilitating the formation of egg masses on the roots.

Growth Media

tryptic soy agar (TSA) and R2A

Temperature 28 °C

Preparation notes: Rhizosphere strains isolated and cultured on TSA and R2A at 28°C; SynCom members co-cultured on TSA (inter-colony/biofilm assays) and grown in TSB and M9 media supplemented with root exudates or TYQ1 supernatant.

Evidence

PMID:41660888

"plated on TSA and R2A media. The plates were then incubated at 28°C for 3–5 days"

Cross-Mech Suite Links

Explore related entities across the CultureBotAI X-Mech knowledge bases:

HabitatMech: cucumber rhizosphere ↗ TaxonMech: Rhizobium pusense TYQ1 ↗ TraitMech: Rhizobium pusense TYQ1 ↗ TaxonMech: Sphingomonas panni SP ↗ TraitMech: Sphingomonas panni SP ↗ TaxonMech: Sphingomonas xanthus SX ↗ TraitMech: Sphingomonas xanthus SX ↗ TaxonMech: Acidovorax soli AS ↗ TraitMech: Acidovorax soli AS ↗ TaxonMech: Acidovorax facilis AF ↗ TraitMech: Acidovorax facilis AF ↗ TaxonMech: Novosphingobium subterraneum NS ↗ TraitMech: Novosphingobium subterraneum NS ↗ CultureMech Growth Media ↗ PathwayMech Pathways ↗