Selective uptake of alkaline earth metals by cyanobacteria forming intracellular carbonates | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Selective uptake of alkaline earth metals by cyanobacteria forming intracellular carbonates

Type de publication:

Journal Article

Source:

Environmental Science & Technology (2016)

Résumé:

The uptakes of Ca, Sr and Ba by two cyanobacterial strains,&nbsp;<i>Cyanothece sp</i>. PCC7425 and<i>Gloeomargarita lithophora</i>, both&nbsp;forming&nbsp;intracellular&nbsp;carbonates, were investigated in laboratory cultures. In the culture medium BG 11 amended with 250 μM of Ca and 50 or 250 μM of Sr and Ba,&nbsp;<i>G. lithophora</i>&nbsp;accumulated first Ba, then Sr and finally Ca. Strontium and barium were completely accumulated by&nbsp;<i>G. lithophora</i>&nbsp;cells at rates between 0.02 and 0.10 fmol.h-1.cell-1 and down to extracellular concentrations below the detection limits of ICP-AES. Accumulation of Sr and Ba did not affect the growth rate of the strain. This sequential accumulation occurred mostly intracellularly within polyphosphate and carbonate granules and resulted in the formation of core-shell structures in&nbsp;carbonates. In contrast,&nbsp;<i>Cyanothece sp</i>. PCC7425 showed neither a preferential accumulation of heavier&nbsp;alkaline&nbsp;earth&nbsp;metals&nbsp;nor core-shell structures in thecarbonates. This indicated that fractionation between alkaline&nbsp;earth&nbsp;metals&nbsp;was not inherent to intracellularly calcifying&nbsp;cyanobacteria&nbsp;but was likely a genetically-based trait of&nbsp;<i>G. lithophora</i>. Overall, the capability of&nbsp;<i>G. lithophora&nbsp;</i>to sequester preferentially Sr and Ba at high rates may be of considerable interest for designing new remediation strategies and better understanding the geochemical cycles of these elements.