A defined light-driven coculture pairing the hot-spring cyanobacterium "Thermoleptolyngbya sichuanensis" XZ-Cy5 with the mat-derived heterotroph Chelatococcus sp. XZ-Ab1. Qing et al. 2026 used pure-culture and coculture comparisons, arsenite oxidation assays, 13CO2 NanoSIMS tracing, and genome analyses to show that XZ-Cy5 supplied photoautotroph-derived organic carbon to Chelatococcus sp. XZ-Ab1, while Chelatococcus detoxified arsenite to arsenate and thereby promoted XZ-Cy5 growth under arsenic stress.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
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| Thermoleptolyngbya sichuanensis XZ-Cy5 | NCBITaxon:3031812 · TaxonMech · TraitMech |
PRIMARY_PRODUCER
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DOMINANT |
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| Chelatococcus sp. XZ-Ab1 | NCBITaxon:3034027 · 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.
Cyanobacterial Organic-Carbon Provisioning
CROSS_FEEDINGIlluminated XZ-Cy5/XZ-Ab1 coculture supports organic-carbon provision from the cyanobacterium to the heterotroph. The abstract reports heterotrophic growth benefit and direct NanoSIMS detection of photoautotroph-derived carbon after 13CO2 labeling. Retain this experimentally supported cross-feeding without assigning an identified secreted molecule or extending the carbon tracer result to nitrogen or oxygen transfer.
Source Taxon: Thermoleptolyngbya sichuanensis XZ-Cy5
Target Taxon: Chelatococcus sp. XZ-Ab1
Biological Processes:
- photosynthesis (GO:0015979 · PathwayMech)
Evidence
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PMID:42468699 - SUPPORT (IN_VITRO)""T. sichuanensis" XZ-Cy5 secreted organic carbon to facilitate heterotrophic growth of Chelatococcus sp. XZ-Ab1"
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PMID:42468699 - SUPPORT (IN_VITRO)"direct evidence of photoautotroph-derived carbon from "T. sichuanensis" XZ-Cy5 to Chelatococcus sp. XZ-Ab1"
Chelatococcus Arsenite Detoxification
MUTUALISMChelatococcus sp. XZ-Ab1 oxidizes arsenite to less-toxic arsenate and promotes XZ-Cy5 growth in coculture. Together with the reciprocal heterotrophic benefit from photosynthetic carbon, this supports mutualism under the tested arsenic-stress conditions. The cyanobacterial monoculture did not oxidize arsenite, whereas the heterotroph did so when supplied organic carbon and oxygen. PARTIAL for the exact oxygen-supply route in coculture: genomic interpretation and a supplemented pure-culture comparison are not direct tracing of cyanobacterial oxygen into arsenite oxidation. No nitrogen transfer or thermodynamic product-removal dependence is asserted.
Source Taxon: Chelatococcus sp. XZ-Ab1
Target Taxon: Thermoleptolyngbya sichuanensis XZ-Cy5
Biological Processes:
- response to toxic substance (GO:0009636 · PathwayMech)
Evidence
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PMID:42468699 - SUPPORT (IN_VITRO)"Chelatococcus sp. XZ-Ab1 promoted growth of "T. sichuanensis" XZ-Cy5"
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PMID:42468699 - SUPPORT (IN_VITRO)"oxidizing toxic As(Ⅲ) to the less toxic arsenate"
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PMID:42468699 - SUPPORT (IN_VITRO)"exposure of a growing culture to 5 mM As(Ⅲ) led to rapid loss of chlorophyll and photosynthetic activity"
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PMID:42468699 - PARTIAL (IN_VITRO)"a pure culture of the mat-derived heterotroph Chelatococcus sp. XZ-Ab1 could oxidize As(Ⅲ) quickly with the addition of organic carbon and oxygen"
Knowledge gaps & discussions (2)
KNOWLEDGE_GAP OPEN Which medium, temperature, light regime, arsenite concentration series, inoculum densities, and time points were used for the XZ-Cy5/XZ-Ab1 coculture?
The PubMed abstract names the exact strains, arsenite-detoxifying mutualism, organic-carbon transfer, oxygen production, NanoSIMS tracing, and pure-culture comparisons, but Europe PMC did not expose open-access full text with the coculture recipe or condition series.
Attaches to: engineering_design, ecological_interactions#Cyanobacterial Organic-Carbon Provisioning, ecological_interactions#Chelatococcus Arsenite Detoxification
KNOWLEDGE_GAP OPEN Which chemical and oxygen-supply routes account for the measured XZ-Cy5/XZ-Ab1 mutualism?
The primary abstract directly supports carbon transfer and reciprocal growth. It separately interprets metabolic complementarity from genomes, including nitrogen provision and oxygen production. These are not equivalent to isotope-resolved oxygen or nitrogen transfer. Full primary methods and route-specific evidence would resolve these details; missing detail does not negate the positive carbon and growth results. The earlier culture-conditions discussion remains open. No new node or arrow is introduced.
Attaches to: ecological_interactions#Cyanobacterial Organic-Carbon Provisioning, ecological_interactions#Chelatococcus Arsenite Detoxification
1 evidence item(s)
Metagenomic and genomic analyses indicated several mechanisms for metabolic complementarity between the two strains
External Resources
| Name | Repository | Resource ID |
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Primary article - Thermoleptolyngbya-Chelatococcus arsenic detoxification coculture
Bioresource Technology article reporting light-driven arsenic detoxification by mutualistic cross-feeding in a thermophilic cyanobacterium-heterotroph coculture. |
OTHER | doi:10.1016/j.biortech.2026.135440 |
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Environmental Factors
| Factor | Value | Unit |
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| High-arsenic Tibetan hot-spring mat source | Tibet high-As hot spring | N/A |
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