A synthetic algae-bacteria consortium for sustainable hydrogen production, composed of the green alga Chlamydomonas reinhardtii and three bacterial species: Microbacterium forte sp. nov., Bacillus cereus, and Stenotrophomonas goyi sp. nov. This mutualistic association produces up to 313 mL H2/L over 17 days in high-cell density cultures. M. forte is the primary bacterial species responsible for improving algal hydrogen production, while the complete bacterial community enhances and sustains photobiological H2 generation through metabolic cooperation.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
|---|---|---|---|
| Chlamydomonas reinhardtii | NCBITaxon:3055 · TaxonMech · TraitMech |
PRIMARY_PRODUCER
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DOMINANT |
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| Microbacterium forte | NCBITaxon:2982533 · TaxonMech · TraitMech |
SYNTROPHIC_PARTNER
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ABUNDANT |
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| Bacillus cereus | NCBITaxon:1396 · TaxonMech · TraitMech |
SYNTROPHIC_PARTNER
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COMMON |
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| Stenotrophomonas goyi — ontology label: Stenotrophomonas | NCBITaxon:40323 · TaxonMech · TraitMech |
SYNTROPHIC_PARTNER
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COMMON |
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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.
Photosynthetic Hydrogen Production
Chlamydomonas produced hydrogen in the mannitol/yeast-extract bacterial coculture. The reported output depends on initial algal density and incubation duration; photohydrogen output does not establish commensalism or bacterial oxygen removal as its mechanism.
Source Taxon: Chlamydomonas reinhardtii
Metabolites: hydrogen (CHEBI:18276 · MediaIngredientMech · CMMMech)
Biological Processes:
- photosynthesis (GO:0015979 · PathwayMech)
- hydrogen biosynthetic process (GO:1902422 · PathwayMech)
Evidence
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PMID:38159768 - SUPPORT (IN_VITRO)"this bacterial community can promote and sustain algal hydrogen production"
Bacterial Enhancement of Algal H2 Production
MUTUALISMThe Chlamydomonas-M. forte pair shows reciprocal nutrient complementation: the alga supports bacterial nutrient deficiencies, while M. forte releases ammonium and acetic acid. M. forte improved hydrogen output, but the pair did not support algal growth under hydrogen-producing hypoxia. Algal growth and prolonged viability in the pair occurred under non-H2-producing aerobiosis; these are distinct conditions.
Source Taxon: Microbacterium forte
Target Taxon: Chlamydomonas reinhardtii
Metabolites: ammonium (CHEBI:28938 · MediaIngredientMech · CMMMech), acetic acid (CHEBI:15366 · MediaIngredientMech · CMMMech)
Biological Processes:
- interspecies interaction (GO:0044419 · PathwayMech)
HYPOTHESIZED - ammonium and acetic-acid provision could support the M. forte-dependent hydrogen improvement. The abstract reports release and output, but does not establish either metabolite as a necessary mediator.
Evidence
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PMID:38159768 - SUPPORT (IN_VITRO)"M. forte sp. nov. was the sole responsible for the improvement in hydrogen production"
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PMID:38159768 - SUPPORT (IN_VITRO)"the bacterium released ammonium (0.19 mM·day-1) and acetic acid (0.15 mM·day-1) for the alga"
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PMID:38159768 - SUPPORT (IN_VITRO)"the alga complemented the nutrient deficiencies of the bacterium"
Multispecies Bacterial Consortium Supporting H2 Production
The three-bacterium community sustained algal hydrogen production in mannitol/yeast-extract medium. Low-density cultures also accumulated algal biomass under hypoxia. B. cereus/S. goyi growth support is a source-proposed explanation for the difference from the M. forte pair, not a demonstration that each member is necessary or that all members benefit reciprocally.
Participating Taxa: Bacillus cereus, Stenotrophomonas goyi, Microbacterium forte, Chlamydomonas reinhardtii
Metabolites: hydrogen (CHEBI:18276 · MediaIngredientMech · CMMMech)
Biological Processes:
- interspecies interaction (GO:0044419 · PathwayMech)
The full bacterial inoculum enables sustained algal hydrogen production in the tested mannitol/yeast-extract cultures; this whole-inoculum comparison does not establish the necessity of every member.
Evidence
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PMID:38159768 - SUPPORT (IN_VITRO)"A naturally occurring multispecies bacterial community composed of Bacillus cereus and two novel bacteria (Microbacterium forte sp. nov. and Stenotrophomonas"
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PMID:38159768 - SUPPORT (IN_VITRO)"When incubated in mannitol- and yeast extract-containing medium, this bacterial community can promote and sustain algal hydrogen production up to 313 mL H2·L-1 for 17 days and 163.5 mL H2·L-1 for 25 days in high-cell (76.7 μg·mL-1 of initial chlorophyll) and low-cell density (10 μg·mL-1 of initial chlorophyll) algal cultures, respectively"
Knowledge gaps & discussions (1)
KNOWLEDGE_GAP OPEN Which metabolite exchanges and bacterial members are necessary for hydrogen enhancement and hypoxic algal growth?
PMID:38159768 separates pairwise hypoxic hydrogen enhancement, pairwise aerobic algal growth and whole-community hypoxic growth. Full methods, results, images and supplements remain unread. Do not import generic sulfur deprivation or oxygen-removal mechanisms. The reported reciprocal nutrient benefit is preserved without assuming its mediation of every endpoint.
Attaches to: ecological_interactions#Photosynthetic Hydrogen Production, ecological_interactions#Bacterial Enhancement of Algal H2 Production, ecological_interactions#Multispecies Bacterial Consortium Supporting H2 Production
Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| Light | continuous illumination | N/A |
| Cell density | 76.7 μg/mL chlorophyll (high) or 10 μg/mL (low) | N/A |
| Medium composition | mannitol and yeast extract | N/A |
| Anaerobic conditions | required for H2 production | N/A |
Growth Media
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