Effect of Chelating Agents on the Absorption of Iron by <I>Phormidium tenue</I>
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概要
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In order to clarify the mechanism of growth of musty-odor producing cyanobacteria, the effect of seven chelating agentssuch as EDTA (Ethylenediaminetetraacetic acid), CyDTA (<I>Trans</I>-1, 2-cyclohexanediamine-N, N, N′, N′-tetraacetic acid), DTPA (Diethylenetriamine-N, N, N′, N″, N″-pentaacetic acid), EDDHA {Ethylenediaminedi (o-hydroxyphenylacetic acid) }, HBED {N, N′-di (2-hydroxylbenzyl) -ethylenediamine-N, N′-diacetic acid}, DESF (Desferrioxamine B), BPDS (Bathophenanthroline disulfonate) on the growth of<I>Phormidium tenue</I>were studied using laboratory cultures.<BR><I>P.tenue</I>grew well in the pfesence of 1: 1 chelates (molar ratio of chelator to Fe) of CyDTA, DTPA, EDDHA and HBED as wellas EDTA as the iron sources.<I>P. tenue</I>grew well in the presenceof CyDTA up to 17-fold for Fe (molar ratio) . However, the growth of<I>P.tenue</I>was suppressed in the presence of DTPA of 7-fold, EDDHA of 3-fold and HBED of 3-fold for Fe (molar ratio), respectively.<I>P.tenue</I>also could utilize Fe<SUP>II</SUP> (BPDS) <SUB>3</SUB>chelate as the iron source. In addition, it could utilize Fe<SUP>II</SUP> (BPDS) <SUB>3</SUB>in the presence of HBED. However, it could not utilize Fe<SUP>II</SUP> (BPDS) <SUB>3</SUB>in the presence of DTPA, DESF or EDDHA.<BR>The present results indicate that<I>P.tenue</I>can utilize a wide variety of iron chelates as the iron sources and has a stronger ability of chelating functions on the cell surfaces compared with<I>O.tenuis</I>and<I>A. macrospora</I>. However, the addition of excess of chelating agents (DTPA, DESF, EDDHA and HBED) having higher stability constants of Fe (III) chelates affected the growth of<I>P.tenue</I>. Furthermore, the results show that the absorption of iron by<I>P.tenue</I>does not only depend on the stability constants of Fe chelates and that it also depends on the chemical structure or characteristics of chelators.
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