Absorption of Iron by Musty-Odor Producing Cyanobacteria in the Absence of Chelating Agents
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概要
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A recent problem for water utilities is musty-odor, which is caused by geosmin or 2-methylisobomeol produced by cyanobacteria.<BR>In order to clarify the mechanism of growth of musty-odor producing cyanobacteria, the effect of iron on the growth of<I>Anabaena macrospora, Phormidium tenue, Oscillatoria trnuid</I>and <I>Oscillatoria brevis</I>was studied.<BR>The growth of A.<I>macrnspora, P. tenue</I>and<I>O. tenuis</I>was suppressed at low levels of colloidal iron (1μMas Fe) in the EDTA-free CT medium, However, at high levels of iron (18μMas Fe) using colloidal iron kept in a refrigerator, <I>A. macrnspora</I>and<I>P.tenue</I>were able to grow although<I>O. tenuis</I>could not When autoclaved colloidal iron was used as the iron source, none of the cyanobacteria except<I>O. brevis</I>were able to grow.<BR>The effect of spongy or powdery iron on the growth of cyanobacteria was also invesdgated.<I>A macrospora, P tenue and O.brevis</I>were capable of growing in media containing spongy or powdery iron, which release Fe (II) continuously, but the growth of<I>O. tenuis</I>was suppressed.<BR>The culture experiments and photoreduction of Fe (III) to Fe (II) show that<I>A. macrospora, P. tenue</I>and<I>O. bnevis</I>can utilize iron even in the absence of EDTA if there are large amounts of iron present in a form photoreducible to Fe (II) . However, <I>O. tenuis</I>was found to require chelated and photoreducible iron for its growth.<BR>The present results and previous studies {Water Sci. Technol., 25 (2) : 207-216 (1992) } indicate that<I>O. brevis</I>has the ability to utilize a wide variety of iron forms such as Fe (III) -EDTA, Fe (II) -BPDS, Fe (III) -Desferrioxamine B (microbial siderophore) chelates, colloidal iron, iron oxides (Fe<SUB>2</SUB>O<SUB>3</SUB>, Fe<SUB>3</SUB>O<SUB>4</SUB>), spongy iron and powdery iron. On the other hand, <I>O. tenuis</I>seems to have specific requirements for the form of iron it can utilize for growth.
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