Cited by 133Algal biology and biofuel productionMicrobial Metabolic Engineering and BioproductionAquatic Ecosystems and Phytoplankton Dynamics

The DOI matches its Crossref record; 148 of the 149 references it cites were found in a registry or an index; 1 of the 89 sources its claims cite were checked for support.

Toward the Enhancement of Microalgal Metabolite Production through Microalgae–Bacteria Consortia

Open access
González-González, Lina Maria, de-Bashan, Luz E.·2021·Biology

Abstract

Engineered mutualistic consortia of microalgae and bacteria may be a means of assembling a novel combination of metabolic capabilities with potential biotechnological advantages. Microalgae are promising organisms for the sustainable production of metabolites of commercial interest, such as lipids, carbohydrates, pigments, and proteins. Several studies reveal that microalgae growth and cellular storage of these metabolites can be enhanced significantly by co-cultivation with growth-promoting bacteria. This review summarizes the state of the art of microalgae–bacteria consortia for the production of microalgal metabolites. We discuss the current knowledge on microalgae–bacteria mutualism and the mechanisms of bacteria to enhance microalgae metabolism. Furthermore, the potential routes for a microalgae–bacteria biorefinery are outlined in an attempt to overcome the economic failures and negative energy balances of the existing production processes.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

This review summarizes how mutualistic microalgae–bacteria consortia can enhance microalgal biomass and metabolite production, including lipids, carbohydrates, pigments, and proteins. It also outlines how growth-promoting bacteria could improve microalgae biorefineries through harvesting, CO2 fixation, wastewater treatment, and residual biomass valorization.

Key findings

  • Co-cultivation with growth-promoting bacteria can increase microalgal growth and biomass: wastewater-isolated bacteria enhanced *C. reinhardtii*, *C. vulgaris*, and *Euglena gracilis* growth up to 2.8-fold; *Pelagibaca bermudensis* enhanced *Tetraselmis striata* biomass productivity two-fold; four bacterial strains increased *C. vulgaris* population by more than 100%.
  • Lipid production is commonly enhanced: *C. reinhardtii* co-cultured with *Azotobacter chroococcum* under nitrogen starvation showed 2.4-fold higher lipid content, 5.9-fold higher lipid production, and up to 19.4-fold higher lipid productivity than axenic cultures; *C. vulgaris* with *A. brasilense* reached up to five-fold higher lipids under autotrophic conditions.
  • Carbohydrate and pigment yields also increase: *C. vulgaris* co-cultivated with *A. brasilense* showed up to 72% and 90% increments in total carbohydrates under autotrophic and heterotrophic conditions, while co-immobilization with *A. brasilense* increased chlorophyll a by up to 35%, chlorophyll b by 176%, β-carotene by 186%, lutein by 152%, and violaxanthin by 129%.
  • Bacteria may improve biorefinery steps: *Bacillus* sp. aggregation of *Nannochloropsis oceanica* reached up to 95% efficiency in 30 s; *A. brasilense* improved CO2 fixation by 25–50% in *S. obliquus*, 46–87% in *C. vulgaris*, and 41–53% in *C. reinhardtii* under high CO2; leachate treatment removed 100% ammonium and up to 90% nitrate, COD, and phenol.

Methods

  • Narrative review of the state of the art on microalgae–bacteria consortia for microalgal metabolite production, mutualistic mechanisms, and biorefinery routes.
  • Synthesizes published studies on synthetic and natural co-cultures, including co-cultivation, immobilization, bacterial extracts/volatiles, omics, nanoSIMS, and wastewater/biorefinery applications.
  • Main analysis is qualitative synthesis, with tables and figures summarizing reported effects on biomass, lipids, carbohydrates, pigments, proteins, harvesting, CO2 fixation, and nutrient removal; no new experimental data are presented.

Limitations

  • The paper states that genomic, transcriptomic, and metabolomic studies in synthetic mutualistic consortia are currently very limited, and that no studies to the authors’ knowledge evaluate microalgae–bacteria consortia in integrated microalgal biorefineries.
  • The paper notes that less attention has been paid to bacterial enhancement of microalgal pigments, carbohydrates, and proteins than to lipids.
  • Evident from the text: as a narrative review, it lacks a systematic search strategy or quantitative meta-analysis, and it compares findings from diverse species, co-culture setups, and cultivation conditions, which limits direct comparability.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.3390/biology10040282

Cites

148 of 148 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Figures

Figure 1 Synthetic mutualism between Chlorella spp. and the microalga growth promoting bacteria (MGPB) Azospirillum brasilense. (a) Scanning electron microscopy. (b) Epifluorescence microscopy. Auto-fluorescence of microalgae appears in orange while bacteria appear in green as result of fluorescent in situ hybridization (FISH) using three specific probes targeting Eubacteria (FAM dye) and one specific probe for A. brasilense (CY3 dye). Arrows show cells of A. brasilense attached to the microalga. (c) Model of the synthetic interaction. Az, Azospirillum brasilense; Cs, Chlorella sorokiniana.
Figure 1 Synthetic mutualism between Chlorella spp. and the microalga growth promoting bacteria (MGPB) Azospirillum brasilense. (a) Scanning electron microscopy. (b) Epifluorescence microscopy. Auto-fluorescence of microalgae appears in orange while bacteria appear in green as result of fluorescent in situ hybridization (FISH) using three specific probes targeting Eubacteria (FAM dye) and one specific probe for A. brasilense (CY3 dye). Arrows show cells of A. brasilense attached to the microalga. (c) Model of the synthetic interaction. Az, Azospirillum brasilense; Cs, Chlorella sorokiniana.CC BY · PubMed Central
Figure 2 Schematic model of a microalgae–bacteria sustainable and cost-efficient system for the production of several metabolites within a biorefinery using different biological routes.
Figure 2 Schematic model of a microalgae–bacteria sustainable and cost-efficient system for the production of several metabolites within a biorefinery using different biological routes.CC BY · PubMed Central

Verification

Claims the paper makes

62 Not checked yet · 8 Own interpretation · 1 Supported so far · 1 No basis given

Verify all 88 references — free account

Show all 31 claims

  • It may state two separate claims as one. 35
  • Probably not a substantial claim. 8
41 of 41
  • The paper relies on this without support.

    The mechanisms involved in a synthetic mutualistic interaction between microalgae and bacteria are similar to those found in natural associations.

    “The mechanisms involved in a synthetic mutualistic interaction between microalgae and bacteria are similar to those found in natural associations.”
  • The authors state this as an assumption.

    The bacteria grow at the expense of the photosynthates produced by the microalga in the Croft et al. experiment.

    “Because the medium where these two microorganisms were growing did not contain any organic carbon source, it is logical to assume that the bacteria grow at the expense of the photosynthates produced by the microalga.”
  • The paper relies on this without support.

    Nutrient exchange is the most common and important type of mutualistic interaction between microalgae and bacteria.

    “In general, nutrient exchange has been considered the most common and important.”
  • The paper relies on this without support.

    The cost of production of microalgae-based proteins, lipids, pigments, and carbohydrates is a bottleneck that prevents many industries from shifting to sustainable production.

    “The cost of production of microalgae-based proteins, lipids, pigments, and carbohydrates is still a bottleneck that prevents many industries from making this desirable shift.”
  • The paper relies on this without support.

    No studies are evaluating microalgae–bacteria consortia in these kinds of biorefineries.

    “Although, as we described earlier, growth-promoting bacteria can significantly enhance the production of these metabolites; to the authors’ knowledge, no studies are evaluating microalgae–bacteria consortia in these kinds of biorefineries.”
  • The paper relies on this without support.

    Natural bacterial communities in wastewater effluents are a combination of beneficial and competing species.

    “Because the natural bacterial communities in wastewater effluents are a combination of beneficial and competing species, artificial consortia are preferred to boost microalgal biomass production.”
  • The paper relies on this without support.

    The viability of bacteria after metabolite extraction depends on the target metabolite and the extraction process.

    “The viability of bacteria after metabolite extraction depends on the target metabolite and the extraction process.”
  • The paper relies on this without support.

    The cost of production related to microalgae CO2 consumption is non-negligible.

    “The non-negligible cost of production related to microalgae CO2 consumption can be significantly reduced”
  • The paper relies on this without support.

    Genomic, transcriptomic, and metabolomic studies in synthetic mutualistic consortia are currently very limited.

    “Thus, although genomic, transcriptomic, and metabolomic studies in synthetic mutualistic consortia are currently very limited, they are of utmost importance in understanding the underlying mechanisms acting in establishing and stabilizing the mutualism.”
9 of 9

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Citations

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Metadata

Authors
González-González, L. M., & de-Bashan, L. E.
Affiliations
The Bashan Institute of Science, 1730 Post Oak Ct, Auburn, AL 36830, USA
Venue
Biology
Publisher
MDPI AG
Published
2021-04-01
Volume
10
Issue
4
Pages
282
ISSN
2079-7737 (ISSN-L)
OpenAlex
W3143606184
Cited by
133
References
149
Citations by year
2026: 21 · 2025: 34 · 2024: 29 · 2023: 19 · 2022: 22 · 2021: 8
FWCI
0.96
Type
journal article
Language
en
Open access
Locations
  • Biology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
  • Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
Keywords
microalgae-bacteria consortia, co-culture, growth-promoting bacteria, lipid production, carbohydrate production, pigments, microalgal proteins, biorefinery, energy balance

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