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      Algae-Bacteria Consortia as a Strategy to Enhance H 2 Production

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          Abstract

          Biological hydrogen production by microalgae is a potential sustainable, renewable and clean source of energy. However, many barriers limiting photohydrogen production in these microorganisms remain unsolved. In order to explore this potential and make biohydrogen industrially affordable, the unicellular microalga Chlamydomonas reinhardtii is used as a model system to solve barriers and identify new approaches that can improve hydrogen production. Recently, Chlamydomonas–bacteria consortia have opened a new window to improve biohydrogen production. In this study, we review the different consortia that have been successfully employed and analyze the factors that could be behind the improved H 2 production.

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          Hydrogen production, storage, transportation and key challenges with applications: A review

          Shahzad Hossain, Atia T. Azad, Mohamed Dawood … (2018)
          Article 0 comments Cited 260 times – based on 0 reviews     Review now
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            Biohydrogen production: prospects and limitations to practical application

            D. Levin (2004)
            Article 0 comments Cited 153 times – based on 0 reviews     Review now
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              Mutualistic interactions between vitamin B12 -dependent algae and heterotrophic bacteria exhibit regulation.

              Ashley Croft, Robin Warren, Van-Anh Nguyen … (2012)
              Many algae are auxotrophs for vitamin B(12) (cobalamin), which they need as a cofactor for B(12) -dependent methionine synthase (METH). Because only prokaryotes can synthesize the cobalamin, they must be the ultimate source of the vitamin. In the laboratory, a direct interaction between algae and heterotrophic bacteria has been shown, with bacteria supplying cobalamin in exchange for fixed carbon. Here we establish a system to study this interaction at the molecular level. In a culture of a B(12) -dependent green alga Chlamydomonas nivalis, we found a contaminating bacterium, identified by 16S rRNA analysis as Mesorhizobium sp. Using the sequenced strain of M. loti (MAFF303099), we found that it was able to support the growth of B(12) -dependent Lobomonas rostrata, another green alga, in return for fixed carbon. The two organisms form a stable equilibrium in terms of population numbers, which is maintained over many generations in semi-continuous culture, indicating a degree of regulation. However, addition of either vitamin B(12) or a carbon source for the bacteria perturbs the equilibrium, demonstrating that the symbiosis is mutualistic and facultative. Chlamydomonas reinhardtii does not require B(12) for growth because it encodes a B(12) -independent methionine synthase, METE, the gene for which is suppressed by addition of exogenous B(12) . Co-culturing C. reinhardtii with M. loti also results in reduction of METE expression, demonstrating that the bacterium can deliver the vitamin to this B(12) -independent alga. We discuss the implications of this for the widespread distribution of cobalamin auxotrophy in the algal kingdom. © 2012 Society for Applied Microbiology and Blackwell Publishing Ltd.
              Article 0 comments Cited 142 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Cells
                Journal ID (iso-abbrev): Cells
                Journal ID (publisher-id): cells
                Title: Cells
                Publisher: MDPI
                ISSN (Electronic): 2073-4409
                Publication date (Electronic): 29 May 2020
                Publication date Collection: June 2020
                Volume: 9
                Issue: 6
                Electronic Location Identifier: 1353
                Affiliations
                Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias, Universidad de Córdoba, Campus de Rabanales, Edif. Severo Ochoa, 14071 Córdoba, Spain; z72fafan@ 123456uco.es (N.F.); dgballester@ 123456uco.es (D.G.-B.); bb1feree@ 123456uco.es (E.F.); bb1gacea@ 123456uco.es (A.G.)
                Author notes
                [* ]Correspondence: alexandra.dubini@ 123456uco.es ; Tel.: +34-957-218-352
                Author information
                https://orcid.org/0000-0001-5957-5392
                https://orcid.org/0000-0002-7564-2281
                https://orcid.org/0000-0001-8825-3915
                Article
                Publisher ID: cells-09-01353
                DOI: 10.3390/cells9061353
                PMC ID: 7348838
                PubMed ID: 32486026
                SO-VID: cba4f2d1-21ad-4fc3-a5d5-3b9ad834b909
                Copyright © © 2020 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 16 April 2020
                Date accepted : 26 May 2020
                Categories
                Subject: Review

                Keywords: algae,bacteria,biohydrogen,chlamydomonas reinhardtii,co-cultures,consortia,hydrogen
                Data availability:
                Keywords: algae, bacteria, biohydrogen, chlamydomonas reinhardtii, co-cultures, consortia, hydrogen

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