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Calcification rate in Emiliania huxleyi Lohmann in response to light, nitrate and availability of inorganic carbon.

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Title: Calcification rate in Emiliania huxleyi Lohmann in response to light, nitrate and availability of inorganic carbon.
Authors: Nimer, N. A.1, Merrett, M. J.1
Source: New Phytologist. Apr93, Vol. 123 Issue 4, p673-677. 5p.
Subjects: Coccolithus huxleyi, Nitrates, Carbon, Photosynthesis, Photons, Stoichiometry, Calcification
Abstract: The relationship between photosynthesis and calcification was investigated in a high-calcifying strain of Emiliania huxleyi. At pH 8.3 and a photon flux density of 50 μmol m-2 s-1 calcification and photosynthetic 14CO2 fixation were carbon saturated at 1 mM DIC (dissolved inorganic carbon) but at a photon flux density μmol m-2 s-1 calcification and photosynthetic 14CO2 fixation were not saturated at the DIC concentration of sea-water, 2 mM. When HCO3- provides the bulk of inorganic carbon the stoichiometry between photosynthetic 14CO2 fixation and calcification was 1:1. In the high-calcifying strain of E. huxleyi the stoichiometry between photosynthetic 14CO2 fixation and O2 evolution was 2:1 but in a low calcifying strain the stoichiometry was 1:1. High nitrate concentrations, i.e. 1000 μM were required to inhibit calcification. The optimum pH for calcification and photosynthetic 14CO2 fixation was 7.8. From the results a model is proposed in which a molecule of HCO3- is the precursor of calcite in the coccolith vesicle with the extrusion of H+ into the cytosol, while another HCO3- provides CO2 in the chloroplast with the extrusion of OH-. The interaction of these processes maintains cytoplasmic pH near neutrality. [ABSTRACT FROM AUTHOR]
Copyright of New Phytologist is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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  Data: Calcification rate in <em>Emiliania huxleyi</em> Lohmann in response to light, nitrate and availability of inorganic carbon.
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  Data: <searchLink fieldCode="DE" term="%22Coccolithus+huxleyi%22">Coccolithus huxleyi</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrates%22">Nitrates</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon%22">Carbon</searchLink><br /><searchLink fieldCode="DE" term="%22Photosynthesis%22">Photosynthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Photons%22">Photons</searchLink><br /><searchLink fieldCode="DE" term="%22Stoichiometry%22">Stoichiometry</searchLink><br /><searchLink fieldCode="DE" term="%22Calcification%22">Calcification</searchLink>
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  Data: The relationship between photosynthesis and calcification was investigated in a high-calcifying strain of <em>Emiliania huxleyi</em>. At pH 8.3 and a photon flux density of 50 μmol m-2 s-1 calcification and photosynthetic 14CO2 fixation were carbon saturated at 1 mM DIC (dissolved inorganic carbon) but at a photon flux density μmol m-2 s-1 calcification and photosynthetic 14CO2 fixation were not saturated at the DIC concentration of sea-water, 2 mM. When HCO3- provides the bulk of inorganic carbon the stoichiometry between photosynthetic 14CO2 fixation and calcification was 1:1. In the high-calcifying strain of <em>E. huxleyi</em> the stoichiometry between photosynthetic 14CO2 fixation and O2 evolution was 2:1 but in a low calcifying strain the stoichiometry was 1:1. High nitrate concentrations, i.e. 1000 μM were required to inhibit calcification. The optimum pH for calcification and photosynthetic 14CO2 fixation was 7.8. From the results a model is proposed in which a molecule of HCO3- is the precursor of calcite in the coccolith vesicle with the extrusion of H+ into the cytosol, while another HCO3- provides CO2 in the chloroplast with the extrusion of OH-. The interaction of these processes maintains cytoplasmic pH near neutrality. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of New Phytologist is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1111/j.1469-8137.1993.tb03776.x
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      – Code: eng
        Text: English
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        PageCount: 5
        StartPage: 673
    Subjects:
      – SubjectFull: Coccolithus huxleyi
        Type: general
      – SubjectFull: Nitrates
        Type: general
      – SubjectFull: Carbon
        Type: general
      – SubjectFull: Photosynthesis
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      – SubjectFull: Photons
        Type: general
      – SubjectFull: Stoichiometry
        Type: general
      – SubjectFull: Calcification
        Type: general
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      – TitleFull: Calcification rate in <em>Emiliania huxleyi</em> Lohmann in response to light, nitrate and availability of inorganic carbon.
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            NameFull: Nimer, N. A.
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              Text: Apr93
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              Y: 1993
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