Journal Article

Induction of Ferric Reductase Activity and of Iron Uptake Capacity in <i>Chlorococcum littorale</i> Cells under Extremely High-CO<sub>2</sub> and Iron-Deficient Conditions

Takayuki Sasaki, Norihide Kurano and Shigetoh Miyachi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 4, pages 405-410
Published in print April 1998 | ISSN: 0032-0781
Published online April 1998 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029383
Induction of Ferric Reductase Activity and of Iron Uptake Capacity in Chlorococcum littorale Cells under Extremely High-CO2 and Iron-Deficient Conditions

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The marine green alga, Chlorococcum littorale, accumulated iron in its cells and showed high activity of plasma membrane ferric reductase under high-CO2 and iron-deficient conditions. These activities disappeared upon exposure to ordinary air and by adding excess FeSO4. The iron uptake had high affinity for the Fe(II) form (Km of 0.13 μM). Carbonylcyanide m-chlorophenylhydrazone and N,N-dicyclohexylcarbodiimide significantly suppressed the iron uptake, suggesting that the Fe(II) uptake was driven by ATPase. These results indicate that high CO2 and iron deficiency cooperatively induce the Fe(II) uptake and cell-surface ferric reductase activity.

Keywords: Chlorococcum littorale; CO2 concentration; Ferric reductase; Iron stress; Iron uptake

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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