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Watermelon Rhizosphere Fusarium-Protective SynCom8

Community ID CommunityMech:000098
Ecological State ENGINEERED
Environment rhizosphere
ENVO:00005801 · HabitatMech ↗

A simplified eight-member watermelon rhizosphere SynCom derived from an initial 16-member grafted-watermelon core community.

Taxonomy

Taxon Ontology ID Functional Roles Abundance
Pseudomonas sp. NCBITaxon:306 · TaxonMech · TraitMech
CROSS_FEEDER
N/A
  • PMID:38840214 - SUPPORT (IN_VITRO)
    "Here, we constructed a synthetic community (SynCom) of 16 core bacterial strains obtained from the rhizosphere of grafted watermelon plants."
watermelon rhizosphere bacteria — ontology label: Bacteria NCBITaxon:2 · TaxonMech · TraitMech
CROSS_FEEDER
N/A
  • PMID:38840214 - SUPPORT (IN_VITRO)
    "Here, we constructed a synthetic community (SynCom) of 16 core bacterial strains obtained from the rhizosphere of grafted watermelon plants."

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 Watermelon Rhizosphere Fusarium-Protective SynCom8 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

Pseudomonas-Centered Metabolic Facilitation

CROSS_FEEDING

Seven selected helper strains promote P. aeruginosa Q6 growth in spent-medium assays; only three of those pairs show bilateral positive effects. PARTIAL: differential substrate depletion and candidate secreted/consumed compounds, including N-acetyl serine, support potential cross-feeding, not compound-specific rescue, resolved stereochemistry or measured transfer in the rhizosphere. MUTUALISM cannot describe all seven helper pairs.

Evidence

  • PMID:38840214 - SUPPORT (IN_VITRO)
    "We identified that seven strains enhanced Pseudomonas aeruginosa Q6"
  • PMID:38840214 - SUPPORT (IN_VITRO)
    "Among these, three strains engaged in mutualistic interactions"
  • PMID:38840214 - PARTIAL (IN_VITRO)
    "indicating metabolic cross-feeding potential among these species"

SSC8 watermelon growth promotion without added pathogen

The eight-member SSC8 improved ungrafted-watermelon growth in non-sterile greenhouse soil, with height, root weight and dry weight comparable to the parent16-member SBC. This simplified-consortium experiment had no added pathogen. The55.6% disease-index reduction and biofilm-pathway enrichment were measured for SBC and must not be assigned to SSC8; neither plant protection nor biofilm mediation is established by this growth assay.

Evidence

  • PMID:38840214 - SUPPORT (IN_VIVO)
    "none of the treatments in this potting experiment were supplemented with pathogen"
  • PMID:38840214 - SUPPORT (IN_VIVO)
    "the growth parameters of the SSC8 group plants, including plant height, root weight, and dry weight, were comparable to the initial SynCom (SBC) group"

Knowledge gaps & discussions (1)

KNOWLEDGE_GAP OPEN Does SSC8 itself suppress Fusarium disease, and do its candidate metabolites or biofilms mediate that effect?

The paper tests pathogen challenge and metagenomic biofilm-pathway enrichment for the parent16-member SBC, whereas the simplified SSC8 experiment measures growth without added pathogen. Spent-medium benefit and metabolomic candidates do not close that cross-experiment causal chain. An SSC8 pathogen challenge and mechanism-specific controls would be required. The broad canonical membership placeholders also need separate supplement-grounded curation under issue1919.

Attaches to: ecological_interactions#Pseudomonas-Centered Metabolic Facilitation, ecological_interactions#SSC8 watermelon growth promotion without added pathogen

1 evidence item(s)
PMID:38840214

none of the treatments in this potting experiment were supplemented with pathogen

Environmental Factors

Factor Value Unit
defined synthetic community design Initial 16 core bacterial strains from grafted watermelon rhizosphere were refined to eight synergistic bacteria centered on Pseudomonas. N/A
  • PMID:38840214 - SUPPORT (IN_VITRO)
    "Here, we constructed a synthetic community (SynCom) of 16 core bacterial strains obtained from the rhizosphere of grafted watermelon plants."

Growth Media

beef extract peptone broth (NB) medium

Temperature 37 °C

Preparation notes: SynCom members were each grown overnight in NB medium, then centrifuged and re-suspended in sterile water to OD600 0.1 and mixed in equal volume (v/v) to establish the SynCom. The SynCom was applied to ungrafted watermelon seedlings (cultivar Zaojia 8424) in polypropylene pots filled with 600 g of non-sterile soil in a greenhouse (daytime 16 h at 30 °C, night 8 h at 26 °C).

Evidence

PMID:38840214

"each of the 16 core strains was inoculated in beef extract peptone broth (NB) medium and incubated overnight at 37℃ at 170 rpm"

PMID:38840214

"The fermentation broth of each strain was centrifuged at 4000 × g for 5 min and re-suspended in sterile water with OD600 adjusted to 0.1. The suspensions of the 16 strains were mixed in equal volume (v/v) to establish the SynCom."

PMID:38840214

"The pot experiments were run in a greenhouse (daytime: 16 h long at 30°C, night: 8 h long at 26°C) located in Nanjing Agriculture University."

PMID:38840214

"Each replicate was run in polypropylene pots filled with 600 g of dry, non-sterile soil with no history of watermelon cultivation."

Cross-Mech Suite Links

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

HabitatMech: rhizosphere ↗ TaxonMech: Pseudomonas sp. ↗ TraitMech: Pseudomonas sp. ↗ TaxonMech: watermelon rhizosphere bacteria ↗ TraitMech: watermelon rhizosphere bacteria ↗ CultureMech Growth Media ↗ PathwayMech Pathways ↗