Article (Scientific journals)
Effect of Culture pH on Properties of Exopolymeric Substances from Synechococcus PCC7942: Implications for Carbonate Precipitation
de Brito, Marlisa Martinho; Bundeleva, Irina; Marin, Frédéric et al.
2022In Geosciences, 12 (5), p. 210
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Keywords :
General Earth and Planetary Sciences
Abstract :
[en] The role of culture conditions on the production of exopolymeric substances (EPS) by Synechococcus strain PCC7942 was investigated. Carbonate mineral precipitation in these EPS was assessed in forced precipitation experiments. Cultures were grown in HEPES-buffered medium and non-buffered medium. The pH of buffered medium remained constant at 7.5, but in non-buffered medium it increased to 9.5 within a day and leveled off at 10.5. The cell yield at harvest was twice as high in non-buffered medium than in buffered medium. High molecular weight (>10 kDa) and low molecular weight (3–10 kDa) fractions of EPS were obtained from both cultures. The cell-specific EPS production in buffered medium was twice as high as in non-buffered medium. EPS from non-buffered cultures contained more negatively charged macromolecules and more proteins than EPS from buffered cultures. The higher protein content at elevated pH may be due to the induction of carbon-concentrating mechanisms, necessary to perform photosynthetic carbon fixation in these conditions. Forced precipitation showed smaller calcite carbonate crystals in EPS from non-buffered medium and larger minerals in polymers from buffered medium. Vaterite formed only at low EPS concentrations. Experimental results are used to conceptually model the impact of pH on the potential of cyanobacterial blooms to produce minerals. We hypothesize that in freshwater systems, small crystal production may benefit the picoplankton by minimizing the mineral ballast, and thus prolonging the residence time in the photic zone, which might result in slow sinking rates.
Research Center/Unit :
InBios - Integrative Biological Sciences - ULiège
Disciplines :
Microbiology
Author, co-author :
de Brito, Marlisa Martinho 
Bundeleva, Irina 
Marin, Frédéric
Vennin, Emmanuelle 
Wilmotte, Annick  ;  Université de Liège - ULiège > Integrative Biological Sciences (InBioS)
Plasseraud, Laurent 
Visscher, Pieter T. 
Language :
English
Title :
Effect of Culture pH on Properties of Exopolymeric Substances from Synechococcus PCC7942: Implications for Carbonate Precipitation
Publication date :
16 May 2022
Journal title :
Geosciences
eISSN :
2076-3263
Publisher :
MDPI AG
Special issue title :
Current and Future Perspectives in Microbial Carbonate Precipitation
Volume :
12
Issue :
5
Pages :
210
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 16 May 2022

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