A two-member Bacillus siamensis and Bradyrhizobium japonicum SynCom that promotes maize straw humification and soil organic carbon.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
|---|---|---|---|
| Bacillus siamensis | NCBITaxon:659243 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
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N/A |
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| Bradyrhizobium japonicum | NCBITaxon:375 · 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.
Straw Humification Cross-Feeding
CROSS_FEEDINGThe source explicitly reports reciprocal growth support by cross-feeding between the two SynCom members. The public supplement supports activity and metabolite-association endpoints, but the full main-text rescue/transfer methods were not reviewed; no particular exchanged metabolite or flux is certified here.
Participating Taxa: Bacillus siamensis, Bradyrhizobium japonicum
Biological Processes:
- nitrogen fixation (GO:0009399 · PathwayMech)
PARTIAL - the source attributes higher measured enzyme activities to cross-feeding-supported growth. The supplement confirms activity endpoints, but the unread main methods limit verification of selective exchange mediation.
Evidence
-
PMID:41264879 - SUPPORT (IN_VITRO)"By cross-feeding, SynCom members enable each other to grow, increase the activities of key enzymes (carboxymethyl cellulase, xylanase, lignin peroxidase, and nitrogenase), and thereby promote maize straw humification"
Straw-Degrading Enzyme Stimulation
The SynCom increased measured carboxymethyl-cellulase, xylanase, lignin-peroxidase and nitrogenase activities in the laboratory assay. Nitrogenase was assayed by acetylene reduction. These are activity endpoints, not evidence that each enzyme is necessary or a member-resolved nitrogen-transfer flux.
Participating Taxa: Bacillus siamensis, Bradyrhizobium japonicum
Metabolites: lignocellulose (CHEBI:180683 · MediaIngredientMech · CMMMech)
Biological Processes:
- cellulose catabolic process (GO:0030245 · PathwayMech)
- xylan catabolic process (GO:0045493 · PathwayMech)
- lignin catabolic process (GO:0046274 · PathwayMech)
- nitrogen fixation (GO:0009399 · PathwayMech)
PARTIAL - the source proposes that enhanced activities promote straw humification and downstream soil-carbon accumulation. Broth enzyme assays and field SOC/necromass outcomes are distinct measurements; selective enzyme mediation of the field effect was not verified from the accessible material.
Evidence
-
PMID:41264879 - SUPPORT (IN_VITRO)"increase the activities of key enzymes (carboxymethyl cellulase, xylanase, lignin peroxidase, and nitrogenase), and thereby promote maize straw humification"
Maize Straw Humification and Soil Organic Carbon Improvement
SynCom inoculation promoted straw humification and increased field soil organic carbon and bacterial necromass. Enhanced microbial-carbon-pump turnover is the source's mechanistic interpretation, not a selectively traced route verified here; not every measured carbon fraction or field enzyme increased.
Participating Taxa: Bacillus siamensis, Bradyrhizobium japonicum
Metabolites: lignocellulose (CHEBI:180683 · MediaIngredientMech · CMMMech)
Biological Processes:
- cellulose catabolic process (GO:0030245 · PathwayMech)
- lignin catabolic process (GO:0046274 · PathwayMech)
Evidence
-
PMID:41264879 - SUPPORT (IN_VIVO)"SynCom inoculation enhanced the in vivo turnover pathway of the microbial carbon pump, thereby promoting straw humification and improving SOC"
Knowledge gaps & discussions (1)
KNOWLEDGE_GAP OPEN Which exchanged metabolites and enzyme activities causally mediate the field carbon outcome?
PMID:41264879 explicitly reports cross-feeding. The reviewed public supplement shows broth activities, ammonium, candidate metabolites and field SOC/necromass, but random-forest metabolite importance is not traced transfer. Main-text rescue/transfer methods and field randomization remain unread; the supplement is not full-article verification.
Attaches to: ecological_interactions#Straw Humification Cross-Feeding, ecological_interactions#Straw-Degrading Enzyme Stimulation, ecological_interactions#Maize Straw Humification and Soil Organic Carbon Improvement
Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| defined synthetic community design | Keystone taxa from dilution microcosms were assembled as Bacillus siamensis B and Bradyrhizobium japonicum G. | N/A |
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