クエン酸鉄及びリン酸鉄を鉄源に用いた場合のかび臭物質産生ラン藻類の増殖

抄録

In order to clarify the mechanism of growth of musty-odor producing cyanobacteria, the effects of iron (III) citrate and iron (III) phosphate as the iron source on the growth of musty-odor producing cyanobacteria Oscillatoria tenuis, Anabaena macrospora, Phormidium tenuis and Oscillatoria brevis were studied using laboratory cultures.
The growth of O. tenuis was remarkably suppressed at even high levels of iron (28μ M as Fe) when not-autoclaved iron (III) citrate was used as the iron source. A. macrospora and P.tenue grew better by using not-autoclaved iron citrate as the iron source compared with the use of autoclaved iron citrate. On the other hand, O. brevis was capable of growing even at low levels of iron (2μM as Fe) using autoslaved iron citrate as the iron source. In addition, the growth of cyanobacteria was assessed using iron (III) phosphate as the iron source. When iron phosphate was used as the iron source, none of cyanobacteria except O. brevis were able to grow. Thus, the order of the ability of Fe absorption among musty-odor producing cyanobacteria used in this study was suggested as follows: O. brevis>>P. tenue≥A.macrospora>O. tenuis. The present results and previous studies (Water Sci. Technol., 25: 207-216, 1992) indicate that O. brevis has the ability to utilize a wide variety of iron forms such as Fe (III) -EDTA, Fe^II (BPDS) ₃, Fe (III) -Desferrioxamine B (microbial siderophore) chelates, colloidal iron, iron oxides, and furthermore autoclaved iron citrate and iron phosphate. On the other hand, O. tenuis seemsto have specific requirements for the iron form it can utilize for growth.