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THE ROLE OF IRON IN THE GROWTH OF MUSTY-ODOR PRODUCING CYANOBACTERIA IN THE LAKE ECOSYSTEM

铁在湖泊生态系统中产生霉味的蓝藻生长中的作用

基本信息

批准号：
07680607
负责人：
NAKASHIMA Susumu
金额：
$ 1.6万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07680607/
关键词：
LAKE ECOSYSTEM MUSTY-ODOR PRODUCING COMPOUNDS CYANOBACTERIA IRON CHELATE COMPOUNDS SIDEROPHORE GEOSMIN 2-METHYLISOBORNEOL

项目摘要

In order to clarify the role of iron in the growth of musty-odor producing cyanobacteria, the effcts of iron on the growth of Oscillatoria tenuis, Anabaena macrospora, Anabaena spiroides, Phormidium tenue and Oscillatoria brevis were studied. A.macrospora, A.spiroides and O.brevis produce geosmin and O.tenuis and P.tenue produce 2-methylisoborneol (MIB). The growth of A.macrospora, A.spiroides and O.tenuis was suppressed at low levels of colloidal iron in the EDTA (chelating agent) -free medium. O.tenuis was found to require chelated and photoreducible iron for its growth. The effects of seven chelating agents on the growth of above musty-odor producing cyanobacteria were studied using laboratory cultures. O.tenuis, A.macrospora, A.spiroides, P.tenue and O.brevis grew well in the presence of EDTA,CyDTA,DTPA,EDDHA,HBED in the presence of 1 : 1 ratio of chelating agent to iron. However, the growth of O.tenuis, A.macrospora and A.spiroides was suppressed in the presence of large amounts of DTPA,EDDHA and HBED.O.brevis was found to have the ability to utilize a wide variety of iron forms such as Fe-EDTA,Fe^<II> (BPDS) _3, spongy iron, powdery iron, Fe (III) -Desferrioxamine B (microbial siderophore) chelates, colloidal ferric hydroxides and more thermodynamically stable crystalline iron oxides. O.brevis was found to have stronger abilities for the chelation of Fe (III) and absorption of iron compared with O.tenuis, A.macrospora, A.spiroides and P.tenue. O.tenuis seems to have very specific requirements for the form of iron it can utilize for growth.

为了阐明铁在产生霉味的蓝藻生长中的作用，研究了铁对细尾藻、大孢子藻、螺旋藻、长尾藻和短尾藻生长的影响。大孢霉、螺旋体霉和短孢霉产生土臭素，藤霉和藤霉产生2-甲基异龙脑素（MIB）。在不含EDTA（螯合剂）的培养基中，低水平的胶态铁抑制了大孢子a.s macrospora, a.s spiroides和o.s tenuis的生长。发现黄貂鱼的生长需要螯合和光还原铁。通过室内培养，研究了7种螯合剂对上述发霉蓝藻生长的影响。在螯合剂与铁的比例为1:1的情况下，铁螯合剂在EDTA、CyDTA、DTPA、EDDHA、HBED的存在下生长良好。然而，在大量DTPA、EDDHA和hbed的存在下，黄毛霉、大孢子霉和螺旋霉的生长受到抑制。研究发现，黄毛霉具有利用多种铁形态的能力，如Fe- edta、Fe^<II> (BPDS) _3、海绵铁、粉状铁、Fe (III) -去铁胺B（微生物铁载体）螯合物、胶体铁氢氧化物和更热稳定的结晶铁氧化物。结果表明，短叶青霉对铁离子的螯合能力和铁离子的吸收能力强于黄叶青霉、大孢子黄叶青霉、螺旋黄叶青霉和黄叶青霉。黄貂鱼似乎对其生长所需的铁元素有非常特殊的要求。