A four-strain rice rhizosphere SynCom from intercropping systems that enhances biomass and phosphorus uptake.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
|---|---|---|---|
| Variovorax paradoxus | NCBITaxon:34073 · TaxonMech · TraitMech |
CROSS_FEEDER
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N/A |
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| Novosphingobium subterraneum | NCBITaxon:48936 · TaxonMech · TraitMech |
CROSS_FEEDER
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N/A |
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| Hydrogenophaga pseudoflava | NCBITaxon:47421 · TaxonMech · TraitMech |
CROSS_FEEDER
|
N/A |
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| Acidovorax sp. — ontology label: Acidovorax | NCBITaxon:12916 · 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.
Soil Available Phosphorus Activation
SynCom inoculation increased available soil phosphorus in the rice pot experiment, alongside lower rhizosphere pH and changes in phosphorus fractions. This is a measured inoculation response; contributions of particular strains or acids are not separately resolved.
Metabolites: phosphate (CHEBI:26020 · MediaIngredientMech · CMMMech)
PARTIAL: greater soil phosphorus availability is a proposed contributor to improved rice phosphorus acquisition. The comparisons do not isolate this contribution from root architectural and transport-associated responses.
Evidence
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PMID:39684532 - SUPPORT (IN_VIVO)"including the direct activation of soil available P, increased root surface area and root tip number"
Phosphorus Acquisition Promotion
SynCom-treated rice showed altered root architecture, phosphorus allocation and expression of phosphate-transporter genes. PARTIAL: these observations support the proposed acquisition/translocation pathway, but expression and endpoint concentrations do not independently establish transporter-mediated flux or necessity.
Metabolites: phosphate ion (CHEBI:35780 · MediaIngredientMech · CMMMech)
Biological Processes:
- phosphate ion transport (GO:0006817 · PathwayMech)
PARTIAL: improved phosphorus access, root architecture and transport-associated responses are proposed contributors to the positive pot biomass/phosphorus outcome. Their separate contributions and necessity for that outcome remain unresolved.
Evidence
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PMID:39684532 - PARTIAL (IN_VIVO)"promotion of root-to-shoot P translocation through up-regulation of Pi transporter genes (OsPht1;1, OsPht1;2, OsPht1;4, OsPht1;6)"
Rice Biomass and Phosphorus Uptake Increase
The four-strain SynCom significantly increased rice dry biomass and phosphorus uptake in the pot comparison. This positive inoculation outcome is distinct from the field rice/soybean intercropping comparison, where rice yield and phosphorus uptake decreased. Benefit to rice is not evidence of reciprocal bacterial fitness.
Metabolites: phosphate ion (CHEBI:35780 · MediaIngredientMech · CMMMech)
Evidence
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PMID:39684532 - SUPPORT (IN_VIVO)"A bacterial synthetic community (SynCom) composed of four bacterial strains (Variovorax paradoxus, Novosphingobium subterraneum, Hydrogenophaga pseudoflava, Acidovorax sp.) significantly enhanced the biomass and P uptake of potted rice plants."
Knowledge gaps & discussions (1)
KNOWLEDGE_GAP OPEN Which pathways mediate the positive pot response?
The complete primary main text distinguishes negative field intercropping effects on rice from positive SynCom pot effects. Soil-P fractions, root traits, root IAA and transporter expression support proposed pathways but do not establish each mediator as necessary. Preserve both existing directions as PARTIAL. MUTUALISM requires reciprocal benefit, not a plant response alone. Non-graph CROSS_FEEDER labels and aliased evidence are unchanged pending issue1764.
Attaches to: ecological_interactions#Soil Available Phosphorus Activation, ecological_interactions#Phosphorus Acquisition Promotion, ecological_interactions#Rice Biomass and Phosphorus Uptake Increase
1 evidence item(s)
the yield and P uptake of intercropped rice were lower than those of rice grown in monoculture
The field comparison must not be conflated with SynCom inoculation of potted rice.
Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| defined synthetic community design | Variovorax paradoxus, Novosphingobium subterraneum, Hydrogenophaga pseudoflava, and Acidovorax sp. were assembled into a bacterial SynCom. | N/A |
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Growth Media
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